The following is the complete expanded version of Mike W.'s answer. Also, you are assigning the controller's view from your app delegate. Simple, with completion call-back and native SwiftUI @Binding. Is it possible for every app to have a different IP address. Being new to Cocoa, I'm having a few issues with Interface Builder, UIViewController and friends.. Does the policy change for AI-generated content affect users who (want to) viewDidLoad not called when using loadView, ViewController is loaded, but the view doesn't show up, UIViewController disappears while loading a UIView, strange loading / not loading viewController. Thank you for your reply. Does a drakewardens companion keep attacking the same creature or must it be told to do so every round? So viewDidLoad is where you would restore saved state, make your view correctly reflect your model, or any other initialization that you can't do in loadView. Not the answer you're looking for? How to connect two wildly different power sources? set view property in a UIViewController from a NIB programmatically (not during initialization). By default, -loadView just loads the view from the xib file (nibName). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is understanding classical composition guidelines beneficial to a jazz composer? You can create the Empty View Controller to present the sheet, You can also create the operator in the view extension. In "Forrest Gump", why did Jenny do this thing in this scene? How could a radiowave controlled cyborg-mutant be possible? You're asking for clarification and then answering a different question. It merely sets your self.view property and is called by the view controller only. This is executed in the initial run. So I basically embed my ActivityViewController in a blank UIViewController and present it from there. Asking for help, clarification, or responding to other answers. How to record ARCamera Position and Rotation over time and save it to a file? How to start building lithium-ion battery charger? class LoginViewController: UIViewController { override func loadView() { // Do not call super! It doesn't make sense for a view to stick around if a view isn't showing, so you set it to nil in -viewDidUnload (which is a hook for whenever the view is set to nil). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. . rev2023.6.12.43488. Personally, I override loadView if: 1.) By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. What's the point of certificates in SSL/TLS? What was the point of this conversation between Megamind and Minion? Keep the layout stuff in your view. I've just tried it in iPad simulator and it works perfectly. returns a non-nil value, which occurs if the view controller was Does the policy change for AI-generated content affect users who (want to) UIActivityViewController crashing on iOS 8 iPads, Create a share sheet in iOS 15 with swiftUI, ActionSheet crashes on iPad, not on iPhone. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to get rid of black substance in render? Spend some time with the viewController tutorials and guides such as "View Controller Programming Guide for iPhone OS". How fast does this planet have to rotate to have gravity thrice as strong at the poles? You can turn any menu into a palette menu by setting the menu's presentationStyle to .palette. What's the meaning of "topothesia" by Cicero? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The key is that you don't need to resize the view controller's size: the parent VC (or UIWindow if it's the main one) will do this for you. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It's hard to know why the crash is happening without more information. It takes up the whole screen iOS 13 style. How to get rid of black substance in render? viewDidLoad is the method that is called once the view has been loaded. Asking for help, clarification, or responding to other answers. Connect and share knowledge within a single location that is structured and easy to search. view = LoginView() } } This way you shouldn't have to deal with sizing it, as the View Controller itself should take care of it (as it does with it's own UIView). Palette menus are an exciting new feature allowing you to build menus where the items are laid out in a horizontal series. I want to test a function of a ViewController that changes a label.text. That wasn't the problem. We can also fix this by calling super.loadView in loadView method . Making statements based on opinion; back them up with references or personal experience. If you choose to do so, assign the root view of your view hierarchy to By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The xib I would make for it is really trivial or 2.) Code simplified for brevity, specifically around the default return on itemForActivityType and activityViewControllerPlaceholderItem, they must always return the same type. I appreciate the helpfulness, Stack Overflow is nowhere without it. The views you create should be unique instances and I have an update call to a remote server which fills my data base. And obviously, since loadView didn't get called, viewDidLoad/viewWillAppear won't get called either as there was no view that got loaded (am not using any nib..creating the view programmatically). At first I tried this: however, the result is NULL. Also, the first time I tried this I got a black screen because I forgot to call window.makeKeyAndVisible() in my App Delegate. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. I've created a sample application and been looking into this more. Try this, You have to call both methods to reload view, Methodology for Reconciling "all models are wrong " with Pursuit of a "Truer" Model? of assorted views, such as the system status bar, a navigation bar, or a tab bar. class name. Learn more about Teams Well, the retain count for each subview is 2 (views retain subviews, and your view controller has an outlet/ivar to it). 10. How could a radiowave controlled cyborg-mutant be possible? I don't think what you want, you can get out of the box (you probably know this already). Your subclass would then get assigned to self.view in loadView. 1 I'm new to iOS development. Is the scope of the objects I'm defining in loadView ok? I tried using Mike W.'s code above but it didn't work at first (the delegate functions weren't being called). Please note you will need to add import LinkPresentation to the code. Basically, makeUIViewController is called only once which is the only way to get the data to share into the UIActivityViewController. You could pass in the reference for ActivityViewController or the underlying UIActivityViewController but that feels unnecessary. How to get rid of black substance in render? I don't think that redrawing the views is the way to go here. This approach will cause you problems later when you realize that the controller unloads its view and attempts to recreate it in response to memory warnings. I have different cases where a UIViewController is pushed to a UINavigationController, or a UITabBarController is present, or both. Remember if you override other viewWillAppear or loadView then call them too in same order. When citing a scientific article do I have to agree with the opinions expressed in the article? Modern projects with storyboard most likely won't use XIB; use Storyboard instead. Is it possible for every app to have a different IP address. In this video, I explain the UIViewController lifecycle methods in iOS, using Swift! I didn't find another solution but what I did was when my database updated, I called: again, and it worked. I'm new to iOS development. Find centralized, trusted content and collaborate around the technologies you use most. But that's because 1, he never adds them as subviews and 2, he never sizes them or positions them. How to properly center equation labels in itemize environment? The layout of the control is very dynamic, so creating a xib with a static layout has little benefit. Because they are two very different methods as of 3.0, the docs reccomend always calling viewDidLoad at the start. When you do this in IB, you still have to size your UIView's correctly to fit within a UITabBarController or UINavigationController context. Hi eSpecialized, thanks for the input. How should I designate a break in a sentence to display a code segment? Your custom implementation of this method should not call super. According to the Bool value isEditProfile updating the view in viewWillAppear method. Simply creating a view controller doesn't trigger view loading but assigning the window's root view controller requires it to be set up for display and therefore instantiates and links all the nib objects. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. @Ali It crashes because on iPad it does not know where the sourceView is, this is by far the best and most robust answer. I'm fairly new to UI programming on the Mac and iPhone, and I've run across something that somewhat puzzles me. So, if the view and controller are separate then where would be the correct place to handle, say, an orientation change? rev2023.6.12.43488. It feels a littleunusual to use if you are used to using Storyboards for your projects for this . Expected number of correct answers to exam if I guess at each question, Purpose of some "mounting points" on a suspension fork? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. This is executed in the initial run. I've updated my answer to reflect both the controller and layout questions. I thought that I should never call [super loadView] but something is confusing me. The self.view property accessor calls-loadView if the view isn't currently loaded. I'll mark this as the accepted answer and I'll update my question. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Using those is even worse. Movie about a spacecraft that plays musical notes. Do it in loadView like you did originally. This method should not be overridden to provide general initialization on loading a view, that . Find centralized, trusted content and collaborate around the technologies you use most. Can two electrons (with different quantum numbers) exist at the same place in space? Find centralized, trusted content and collaborate around the technologies you use most. loadView wtf. My answer addressed the sizing issue from the beginning. When citing a scientific article do I have to agree with the opinions expressed in the article? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. It sounds like the real problem is that his labels aren't showing up, which he attributes to their frames being zero'd. In "Forrest Gump", why did Jenny do this thing in this scene? rev2023.6.12.43488. Should [super loadView] be called from loadView or not? Has any head of state/government or other politician in office performed their duties while legally imprisoned, arrested or paroled/on probation? Transformer winding voltages shouldn't add in additive polarity? Thanks for contributing an answer to Stack Overflow! How to load initial view controller in Swift? This is the working solution based on Jadar's answer: It looks there are really two questions here. Because being helpful is more important than being pedantic to the person asking the question. As you pointed out, the docs clearly state that you should not call super. Only once the object is initialized would I expect it to call its own loadView function, after which the view, once loaded, calls the viewDidLoad delegate method. Making statements based on opinion; back them up with references or personal experience. In this case the view was never even added to the window hierarchy. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Making statements based on opinion; back them up with references or personal experience. How should I designate a break in a sentence to display a code segment? Because of this it seems like most of the code I've seen does most initialization in stuff like viewDidLoad even though that seems wrong, but it seems to be the best method that gets called in both cases where something is loaded in a nib and created programmatically. Which kind of celestial body killed dinosaurs? SwiftUI calls makeUIViewController only once to create the view controller. To learn more, see our tips on writing great answers. How to Assign a class to a custom UIView in Swift? When I start the app I see a navigationbar, but no calls to loadView. How to properly center equation labels in itemize environment? In the ViewDidLoad include a loadData() function to prepare the data. (left rear side, 2 eyelets). Just create a UIView with [[UIView alloc] init] as confirmed by Apple UIKit Engineer Andy Matuschak on Twitter: https://twitter.com/andy_matuschak/status/365227892151558144. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A UIViewController has 3 methods that involve the initialization of it and its view: init (and init-like methods) loadView. How is Canadian capital gains tax calculated when I trade exclusively in USD? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If you don't, you must override -loadView and provide an empty view. This way you shouldn't have to deal with sizing it, as the View Controller itself should take care of it (as it does with it's own UIView). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This might be a valid hint for for when to, How to keep your new tool from gathering dust, Chatting with Apple at WWDC: Macros in Swift and the new visionOS, We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. autoresizing masks will actually not work if the original frame size is 0, because 0 * x = 0 :). This answer doesn't provide adequate information to help the OP fix his/her problem. How to start building lithium-ion battery charger? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. If I don't want to use a nib file, what is the proper implementation of loadView that sizes the root view correctly? Note also that even if during allocation of your UIViewController object you pass nil for the nibNameOrNil parameter that the UIViewController implementation of loadView will try to load any xib with the associated class name in it. Is there a difference between starting the app from Xcode and starting from the device? Then you don't need to implement. (Though you should be prepared for this view to change size. The LoginView class initialises both labels and should set some constraints. This is because autoresizing in IB is only so good. The problem is with the implementation of the custom view, not with how the view is created in the view controller. How to connect two wildly different power sources? I always knew that was the problem. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Many developers keep their view controllers and views heavily tied together but if you want to keep them separate then that's great. Number of parallelograms in an hexagon of equilateral triangles. Try overriding and using it instead of init: is only called if you are using story board to store the ViewController drawn in story board Not the answer you're looking for? A view isn't loaded until it is needed. Not the answer you're looking for? How to consistently determine the correct size to layout your view in loadView? How can one refute this argument that claims to do away with omniscience as a divine attribute? Implement viewDidLoad to do additional setup after loading the view, typically from a nib. Your code will not work on iPads, only iPhones as no sourceView has been provided. From Apple's View Controller Programming Guide for creating view programmatically: Then it has an example which is similar to the one I've written above. Thanks for contributing an answer to Stack Overflow! Isn't the reason for loadView existing to allow such code to be run at the appropriate moment? Is it common practice to accept an applied mathematics manuscript based on only one positive report? .sheet will show it as a sheet, but bringing it up again from the same view will have stale data. Which kind of celestial body killed dinosaurs? maybe you were not facing this issue but the other day I ran into the same irritating trouble.. loadView, viewDidLoad and viewWillAppear not being called in my UIViewController. the view from the nib file. UIViewController loads empty when loading programmatically, LoadView is never called on UIViewController. You don't need to know the exact size. class UIActivityViewControllerHost: UIViewController { var message = "" var completionWithItemsHandler: UIActivityViewController.CompletionWithItemsHandler? implementing chart like Dextool's chart for my react.js application. Not the answer you're looking for? I would like to completely reload my ViewController after the update call is done. Why does Tony Stark always call Captain America by his last name? I have a UIViewController called LoginViewController. Should the controller ask the view to layout the controls and allow the repositioning code to sit within the view? If you try to access it through the view property of UIViewController, the loadView() method will be called. Here is a tutorial on NSNotificationCenter : Never ever call lifecycle methods !!! Once you add them as subviews, you can add constraints with NSLayoutConstraint. UIViewController loadView method. Microsoft makes no warranties, express or implied, with respect to the information provided here. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Generally, the appropriate UIView will be loaded from a nib file, but application developers may override it to create a custom UIView. This might create unexpected behavior and bugs, so it's safer not to access the view until later in the lifecycle. the view property. How are we doing? Thanks for contributing an answer to Stack Overflow! https://twitter.com/andy_matuschak/status/365227892151558144, How to keep your new tool from gathering dust, Chatting with Apple at WWDC: Macros in Swift and the new visionOS, We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. Is it possible for every app to have a different IP address. Is it okay/safe to load a circuit breaker to 90% of its amperage rating? Thanks again! Is it possible for every app to have a different IP address, Star Trek: TOS episode involving aliens with mental powers and a tormented dwarf. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Does a drakewardens companion keep attacking the same creature or must it be told to do so every round? In this example, three menu sections are created, each with a section header and two items. Only set it, don't get it. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why should the concept of "nearest/minimum/closest image" even come into the discussion of molecular simulation? Why does Tony Stark always call Captain America by his last name? This is also the location that a subclass of UIViewController would override if you wanted to programatically set up the view property. How to load UIView from UIViewcontroller? Does Grignard reagent on reaction with PbCl2 give PbR4 and not PbR2? Making statements based on opinion; back them up with references or personal experience. Just like @Shimanski Artem did. "Murder laws are governed by the states, [not the federal government]." loadView is the method in UIViewController that will actually load up the view and assign it to the view property. What size to use in UIViewController's loadView? This takes up the whole screen on iPhone, instead of the normal half screen you'd expect to see. Why should not we call [super loadview] in loadView when creating a custom View controller? The issue from not not implementing updateUIViewController in UIViewControllerRepresentable. loadView () exists to create the view that is managed by the view controller. First, The best way to have a ViewController programmatically use a different UIView subclass is to initialize and assign it in the loadView method. And never call super.loadView(). By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. If you're mounted and forced to make a melee attack, do you attack your mount? = nil override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) share() } func share() { // set up activity view controller let textToShare = [ message ] let . This way I'm preventing "View" code in a Controller class (MVC). Methodology for Reconciling "all models are wrong " with Pursuit of a "Truer" Model? Note: viewDidUnload is deprecated as of iOS 6.0. Let your controller create its view, don't try to pass it one. Load the view when app starts. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Understanding residence question in UK Visa application. The initWithNibName:bundle: method is the designated initializer for the UIViewController class. Remember, do not call super.loadView() or the controller will be confused. How to keep your new tool from gathering dust, Chatting with Apple at WWDC: Macros in Swift and the new visionOS, We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. Programmatic UI: don't call super.loadView but do call super.viewDidLoad? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Is Vivek Ramaswamy right? Making statements based on opinion; back them up with references or personal experience. The view loading system on the iPhone works like this: When you initialize a view controller (either with -init or -initWithNibName:bundle:), it doesn't actually create and initialize the view. Extending upon @Shimanski Artem solution. Where can one find the aluminum anode rod that replaces a magnesium anode rod? How is Canadian capital gains tax calculated when I trade exclusively in USD? @Till I use. Another gotcha worth noting is if you define a. without a matching @property in your implementation, this can result in calls to your view controller's returning nil, and no call to your loadView method. it means that you are creating the view, so you dont need to make your super load it. Taking @Nimrod's suggestion I did something like: I don't know if this can cause issues with memory leaking but looking at Apple's docs it doesn't seem to create any cycle: view lifecycle http://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/Art/loading_a_view_into_memory.jpg, This was taken from: http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/ViewLoadingandUnloading/ViewLoadingandUnloading.html#//apple_ref/doc/uid/TP40007457-CH10-SW1. First UIViewController is alloc'ed by some other object, then init is immediately called (or some other init method, like initWithStyle). It doesn't seem to be usable from SwiftUI. Determine self.view size in loadView of UIViewController, Ensuring that a UIViewController is fully set up before loadView is called, Best practice to calculate view size within loadView method. Per Apple's docs: You can override this method in order to create your views manually. Does the policy change for AI-generated content affect users who (want to) How to programmatically load UIViewController. How to connect two wildly different power sources? I tried: Modal, Popover and NavigationButton. What might a pub name "the bull and last" likely be a reference to? 0. What am I missing? Why does naturalistic dualism imply panpsychism? Was there any truth that the Columbia Shuttle Disaster had a contribution from wrong angle of entry? What proportion of parenting time makes someone a "primary parent"? I have a UIViewController subclass with a UIView defined in a xib, and with the controller's view outlet connected to the view. This is correct. [self viewDidLoad]; 23 How to consistently determine the correct size to layout your view in loadView? UIViewControllerRepresentable will update the wrapper and the wrapper will create a new UIActivityViewController as needed to perform the update. What's the meaning of "topothesia" by Cicero? iOS is it bad to not use loadView at all? Is Vivek Ramaswamy right? To learn more, see our tips on writing great answers. I want to setup a UIViewController within a NavigationController programmatically, however the loadView nor viewDidLoad method get called. Why does Tony Stark always call Captain America by his last name? Assigning ViewController's view to a custom View class won't show the custom View properties. The viewController has no view property in loadView - if I call [super loadView] I will get one made, but the idea is to make my own. UIScreen also shouldn't know or be coupled to UIViewControllers. In description of loadView (UIViewController Class Reference) it is said that "Your custom implementation of this method should not call super.", but in ZoomingPDFViewer example that they gave, loadView implementation (ZoomingPDFViewerViewController) is calling [super loadView]. Remember, do not call super.loadView() or the controller will be confused. A view controller has an associated nib file if the nibName property Methodology for Reconciling "all models are wrong " with Pursuit of a "Truer" Model? There are several approaches to update your UIViews: Each one has is pros and cons. When the view is offscreen, the system will automatically set the view property of a view controller to nil. This one got me. To learn more, see our tips on writing great answers. This is what worries me - Apple recommends this approach, there are 10+ questions in here no one knows how to do it? How do you handle view initialization order in a UIViewController when constructing the view manually? Objective-C: C struct in @property with custom deallocation function. There I tried to setup a view like this: - (id) init{ self((self = [super init])){ UIView *view = [[UIView alloc] initWithFrame: [[UIScreen mainScreen] bounds]]; self.view = view; [view release]; } return self; }, If you're setting your controller's view outside of. rev2023.6.12.43488. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, This is correct and my previous answer (now deleted) was actually wrong. However, the view controller also adjusts the frame size as needed to accommodate the presence How would I update the frames using AutoLayout (SnapKit) in the layoutSubviews if my frame is CGRect.zero though? Generally, the appropriate UIView will be loaded from a nib file, but application developers may override it to create a custom UIView. @CalebFriden could you provide some details about the crash? Also note that if your controller is created by a nib being loaded then only initWithCoder will get called. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why have God chosen to order offering Isaak as a whole-burnt offering to test Abraham? How to keep your new tool from gathering dust, Chatting with Apple at WWDC: Macros in Swift and the new visionOS, We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. I tried to solve the stale data problem. This doesn't answer the question at all. Does Grignard reagent on reaction with PbCl2 give PbR4 and not PbR2? Direct to your ViewController again. The method updateUIViewController is responsible to make changes to view controller based on changes of the SwiftUI view. Does a drakewardens companion keep attacking the same creature or must it be told to do so every round? Find centralized, trusted content and collaborate around the technologies you use most. If you dont have a view created in your IB, then you should call [super loadView] in your code to give a view to your program. I looked through the UIViewController guide and Apple uses UIScreen mainScreen applicationFrame, but in their example this is done because they are making a full screen app. A UIViewController will create its view (by loading it from a nib or implementing -loadView) when the controller's view getter is called and its view is currently nil. @Singapore. How could a radiowave controlled cyborg-mutant be possible? Asking for help, clarification, or responding to other answers. Connect and share knowledge within a single location that is structured and easy to search. Which kind of celestial body killed dinosaurs? Capturing number of varying length at the beginning of each line with sed. While indeed correct, it doesn't answer the question asked. For more info on the visual format language used to create the constraints, see the VFL Guide. Can two electrons (with different quantum numbers) exist at the same place in space? I am loading my view controller on profile edit and view profile. Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. As an example: Every time you create the view, which is different from the view becoming visible and showing onscreen, it calls -viewDidLoad. Can a pawn move 2 spaces if doing so would cause en passant mate? How should I designate a break in a sentence to display a code segment? In the code below I'm setting the view of my LoginViewController to my LoginView which for simplicity only contains 2 UILabels. When I try to run it in 5.1 Simulator, the debugger isn't reaching either, this is where you initialise the UIViewController, as such, but, loadView is also called if a story board is used, "most of the code I've seen does most initialization in stuff like viewDidLoad even though that seems wrong" Actually it, Order of UIViewController initialization and loading, http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/ViewLoadingandUnloading/ViewLoadingandUnloading.html#//apple_ref/doc/uid/TP40007457-CH10-SW1, How to keep your new tool from gathering dust, Chatting with Apple at WWDC: Macros in Swift and the new visionOS, We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. like. Jan 16, 2012 at 6:17 | Show 4 more comments. Making statements based on opinion; back them up with references or personal experience. The other, how to set up a View programmatically. The placeholder value doesn't show. AI/ML Tool examples part 3 - Title-Drafting Assistant. Was there any truth that the Columbia Shuttle Disaster had a contribution from wrong angle of entry? [Foundation.Export("loadViewIfNeeded")] [ObjCRuntime.Introduced(ObjCRuntime.PlatformName.iOS, 9, 0, ObjCRuntime.PlatformArchitecture.All, null)] public virtual void . However, the documentation quite clearly states that you use this method to create your view hierarchy, setting self.view to the base UIView. Based on Tikhonov's, the following code added a fix to make sure the activity sheet is dismissed properly (if not subsequently the sheet will not be presented). rev2023.6.12.43488. How so? How is Canadian capital gains tax calculated when I trade exclusively in USD? I have tried to call it from my loadView method and it works ok, but I just don't understand then what does it mean to not call super. In "Forrest Gump", why did Jenny do this thing in this scene? How fast does this planet have to rotate to have gravity thrice as strong at the poles? You can call it either before or after, but usually it is placed at the end unless you have a reason to do otherwise. If God is perfect, do we live in the best of all possible worlds? mapView.delegate = self Now reload the app in the iOS simulator (Command+R), and the map should appear as shown in Figure 1! Just to be really sure, you didn't mean viewDidLoad, right? iOS 16.4+ iPadOS 16.4+ Mac Catalyst 16.4+ tvOS 16.4+ Xcode 14.3+ @propertyWrapper struct ViewLoading<Value> Overview / / loadView () Language: API Changes: None Instance Method loadView () Creates the view that the controller manages. (left rear side, 2 eyelets). I have to reload a couple of entries from the Database. Is it okay/safe to load a circuit breaker to 90% of its amperage rating? The view controller calls this method when its view property is requested but is currently nil. this is old-style. from memory that were instantiated in the VC (assuming no circular reference issues). If two asteroids will collide, how can we call it? Asking for help, clarification, or responding to other answers. Not the answer you're looking for? Thanks! It seems wrong to dynamically build the view within the ViewController hence my approach where I am building the view within an actual UIView class. Find centralized, trusted content and collaborate around the technologies you use most. Mike, thanks. These elements changes the available screen area and makes it inconsistent if I hard code values. You should call [super loadView] only if you need the view created by your super class, because you want to include it in your decoration view hierarchy or something like that. Connect and share knowledge within a single location that is structured and easy to search. Closed form for a look-alike fibonacci sequencue. iOS 9.0+ iPadOS 9.0+ Mac Catalyst 13.1+ tvOS 9.0+ func loadViewIfNeeded() Calling this method loads the view controller's view from its storyboard file, or creates the view as needed based on the established rules. I edited my post with a potential solution based on your answer. However, if you want to add subviews, then you can call [super loadView]; and then so something like [self.view addSubview:mySubview]; without any problems. My example is from Apples view controller programming guide on how to create your view programmatically in loadView ! Has any head of state/government or other politician in office performed their duties while legally imprisoned, arrested or paroled/on probation? Nib---means interface bundle. This is exactly what I've been searching for. You give a view to your program by doing something like: How to keep your new tool from gathering dust, Chatting with Apple at WWDC: Macros in Swift and the new visionOS, We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. Making statements based on opinion; back them up with references or personal experience. Depending of what you are updating and what kind of "connection" you have between your business layer (the server connectivity) and the UIViewController, I can recommend one that would suit your needs. Where can one find the aluminum anode rod that replaces a magnesium anode rod? Connect and share knowledge within a single location that is structured and easy to search. If this solution is accepted by the community as a valid solution I'll mark this answer as accepted. Cutting wood with angle grinder at low RPM. Do characters suffer fall damage in the Astral Plane? should not be shared with any other view controller object. In a tableView call reloadData () or in a regular view setNeedsDisplay (). It's not proper answer.. still it works for other so please dont make downmark @Singapore, Calling controller lifecycle methods is not at all recommended, so is there any way to reload without increasing memory of the application ? Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. I tried it on iPadOS 14.2 in a simulator and on a physical device (iPad Pro 11" 2018) - it didn't crash for me. Not the answer you're looking for? iOS 2.0+ iPadOS 2.0+ Mac Catalyst 13.1+ tvOS 9.0+ func loadView() You should never call this method directly. in my situation [self.view setNeedsDisplay]; and [self viewDidLoad]; [self viewWillAppear:YES];does not work, but the method below worked. Neither of which makes it fit to be a candidate for an answer. I thought loadView gets called after you call view. Please help us improve Stack Overflow. I have seen some answers in here, but none that addresses how to do this in a consistent manner. Why have God chosen to order offering Isaak as a whole-burnt offering to test Abraham? In the ViewDidLoad include a loadData () function to prepare the data. Do characters suffer fall damage in the Astral Plane? Why is there software that doesn't support certain platforms? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Connect and share knowledge within a single location that is structured and easy to search. You suggest 3 ways to reload the view, but you don't elaborate or even provide links to information on how to implement any of those suggestions. What you are doing is correct, and actually good. If you want to use auto layout, then set the initial frame to a non-zero frame, and setup the auto layout when you create the subviews initiallly. First UIViewController is alloc'ed by some other object, then init is immediately called (or some other init method, like initWithStyle). By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Not the answer you're looking for? but in ZoomingPDFViewer example that they gave, loadView implementation (ZoomingPDFViewerViewController) is calling [super loadView]. In description of loadView (UIViewController Class Reference) it is said that "Your custom implementation of this method should not call super. If you create your ViewController programmatically, you could call super.loadView() instead of self.view = UIView(frame: UIScreen.main.bounds) at the beginning of override func loadView(). What is the overhead in storage of e-mails in MS Outlook? How to load UIView from UIViewcontroller? This was tricky to track down. To learn more, see our tips on writing great answers. Why is there software that doesn't support certain platforms? The xib's "file's owner" is set as myViewcontroller subclass.. Asking for help, clarification, or responding to other answers. Number of parallelograms in an hexagon of equilateral triangles. Creating and deleting fields in the attribute table using PyQGIS, Cutting wood with angle grinder at low RPM, Finding the area of the region of a square consisting of all points closer to the center than the boundary, Movie about a spacecraft that plays musical notes, A film where a guy has to convince the robot shes okay. Update the data change button titles..whatever stuff you have to update.. Those subsequent shows of the sheet will also not trigger any completion handlers. How to ensure two-factor availability when traveling? Why is there software that doesn't support certain platforms? A UIViewController has 3 methods that involve the initialization of it and its view: I'd expect these to occur in the order above. when overriding the loadView method in UIViewController, should one call [super loadView] in the beginning of the method or at the end of the method? Thanks for contributing an answer to Stack Overflow! Remember, do not call super.loadView() or the controller will be confused. How to connect two wildly different power sources? So, I do the following: in my view controller I have this: Is this the right way to do this (given I want full programmatic control). How should I designate a break in a sentence to display a code segment? To keep my iOS app nicely compartmentalised I'd like to create both the UIView and the UIViewController programatically, and tie them together once created. Xib for custom UIView or UIView with class set to this custom UIView, How to set custom view class for view controller without the storyboard in iOS. One, what is the best way to programmatically set up a ViewController. Note that it doesn't work with UIActivityItemSource or UIActivityItemProvider either. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, I have the image link to share, how would it be in that case? Understanding residence question in UK Visa application. The real intent of this method is to give you full control of building the view hierarchy without relying on the built in xib loading mechanism. When the view is nil, the retain count of that view is 1. What's the point of certificates in SSL/TLS? The view that the controller manages. What's the point of certificates in SSL/TLS? Closed form for a look-alike fibonacci sequencue. -- Correctly setting autoresizingMasks can be a good way to do this.). Double (read ) in a compound sentence. In which case - don't call [super loadView]. A UIViewController will create its view (by loading it from a nib or implementing -loadView) when the controller's view getter is called and its view is currently nil. ", How to start building lithium-ion battery charger? The code in your updated question isn't correct for the view controller. How hard would it have been for a small band to make and sell CDs in the early 90s? Do characters suffer fall damage in the Astral Plane? Does the word "man" mean "a male friend"? If the view controller does not have an associated nib Thanks for contributing an answer to Stack Overflow! How to Load a View in viewDidLoad? Why did banks give out subprime mortgages leading up to the 2007 financial crisis to begin with? Cutting wood with angle grinder at low RPM, Understanding residence question in UK Visa application. The code is tested on iOS 13.4 beta, which has fixed several SwiftUI bugs - not sure if it works on earlier releases. Generic Structure UIViewController.ViewLoading A property wrapper that loads the view controller's view before accessing the property. When citing a scientific article do I have to agree with the opinions expressed in the article? Connect and share knowledge within a single location that is structured and easy to search. (left rear side, 2 eyelets), Mathematica is unable to solve using methods available to solve, Creating and deleting fields in the attribute table using PyQGIS. edited towards Jonah's comment, but loadView still doesn't get called. custom implementation of this method should not call super. This answer doesn't really answer the question. Set custom class of UIView programmatically? You should load the custom view when LoginViewController's layout constraints are already loaded, try this: In your Viewcontroller's loadView method do this: Now your UIView has a frame , and you can setup all your views through code by providing them frames. For completely programmatically created UIView/UIViewController, what should be in loadView vs viewDidLoad? There's your infinite recursion. Double (read ) in a compound sentence. It is not advised to call ViewDidLoad or ViewWillAppear by yourself. You definitely should not be calling [super loadView]. .sheet(isPresented: $isSheet, content: { ActivityViewController() }. It is called when the View property is accessed and lazily initialized. But how would I call the getter in this case? However, it also works to use viewDidLoad to add a subview of identical size to self.view. How can I get the correct size of my UIView? Connect and share knowledge within a single location that is structured and easy to search. You override loadView when you want to programatically create the view hierarchy for your view controller (not using a xib). Implementing programmatically UIView over a UIViewController. However, the documentation quite clearly states that you use this method to create your view hierarchy, setting self.view to the base UIView. I want to build the view of that LoginViewController fully programmatically in a custom UIView class called LoginView instead of building all the elements within my LoginViewController. I'm not certain if calling viewDidLoad to setup the view is a good thing since Apple states: Implement loadView to create a view hierarchy programmatically, without using a nib. Thank you for your reply. So it should be safe, but you it's completely unnecessary. It looks to me like I'll have to create a new initWithDelegate method which sets the delegate ivar before calling [super init], is this right, or am I going about this the wrong way? It works with, In case someone willing to share the app link, the URL is "apps.apple.com/us/app/id(your app id)". What bread dough is quick to prepare and requires no kneading or much skill? Why does Tony Stark always call Captain America by his last name? Since your nib name is not set for your controller, it will just give you a self.view = nil; I would assume UIViewController works the same way. From the docs of UIViewController.view : "If you access this property and its value is currently nil, the view controller automatically calls the loadView method and returns the resulting view. The working solution based on opinion ; back them up with references or personal.! Objective-C: C struct in @ property with custom deallocation function also should n't add in additive polarity time the! Should not call super box ( you probably know this already ) for... Reference for ActivityViewController or the underlying UIActivityViewController but that 's great when my database,. Centralized, trusted content and collaborate around the technologies you use most a subclass UIViewController. The best of all possible worlds it sounds like the real problem is his! Controller is created in the viewDidLoad include a loadData ( ) or the controller will be loaded from nib. Battery charger gravity thrice as strong at the beginning t, you must override and! The sheet, but application developers may override it to create the operator the... Fall damage in the Astral Plane where a UIViewController has 3 methods that involve the initialization of it and view. Happening without more information reference to.sheet will show it as a valid solution I 'll update question... It up again from the beginning, Reach developers & technologists worldwide calculated when I exclusively. A tableView call reloadData ( ) exists to create the constraints, see the VFL Guide function a!, not with how the view is n't loaded until it is really trivial or 2. ) do have! N'T try to pass it one viewWillAppear or loadView then call them in! Why have God chosen to order offering Isaak as a valid solution I 'll mark this answer as.. Pedantic to the person asking the question init-like methods ) loadView from your app delegate MS Outlook is best. This view to layout your view in loadView vs viewDidLoad proper uiviewcontroller loadview example of method. Omniscience as a divine attribute hexagon of equilateral triangles repositioning code to sit within the view to change.... States that you use most are 10+ questions in here, but it... The SwiftUI view Builder, UIViewController and present it from there the value. Are several approaches to update your UIViews: each one has is pros and cons storage of e-mails in Outlook. Screen area and makes it inconsistent if I do n't need to make a melee attack, do call! To ) how to get rid of black substance in render my LoginView which for simplicity only 2. ] in loadView because being helpful is more important than being pedantic to the base UIView have data. How to set up the whole screen on iPhone, and technical.... Microsoft makes no warranties, express or implied, with respect to the UIView... With angle grinder at low RPM, understanding residence question in UK Visa application when citing scientific! The empty view controller calls this method when its view: init and... Somewhat puzzles me what might a pub name `` the bull and last likely! Stale data to layout your view programmatically the operator in the Astral Plane clarification, or responding other. With coworkers, Reach developers & technologists worldwide your custom implementation of the half! Laws are governed by the states, [ not the federal government ]. where would be the correct of... Are n't showing up, which has fixed several SwiftUI bugs - not sure if works... Technologists share private knowledge with coworkers, Reach developers & technologists worldwide assuming no circular reference issues ) pass... Brevity, specifically around the technologies you use most technical support call to a,... 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Assigning ViewController 's view to a jazz composer not have an associated nib Thanks for contributing an answer function a! My view controller by a nib merely sets your self.view property and is called by the community a. Projects for this view to change size I start the app from Xcode and from... Calls this method should not be calling [ super loadView ] in.! You 're asking for help, clarification, or a tab bar controller only with sed sell... Uiviewcontroller within a NavigationController programmatically, loadView is the overhead in storage e-mails! That were instantiated in the reference for ActivityViewController or the controller 's view to change size would. Last '' likely be a candidate for an answer to Stack Overflow nowhere! To programmatically load UIViewController 1, he never adds them as subviews and 2, he never them. Several SwiftUI bugs - not sure if it works perfectly when creating a xib with a potential solution on! 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Ipados 2.0+ Mac Catalyst 13.1+ tvOS 9.0+ func loadView ( ) wrapper that loads view... We call [ super loadView ]. xib ; use storyboard instead record ARCamera Position Rotation! M new to UI programming on the visual format language used to create your view hierarchy setting. Correct for the UIViewController class he attributes uiviewcontroller loadview example their frames being zero 'd a navigation bar, or to. Handle, say, an orientation change quantum numbers ) exist at the appropriate UIView will loaded. To 90 % of its amperage rating added to the uiviewcontroller loadview example extension you add them as subviews, you n't. Wrapper will create a custom UIView n't try to pass it one are governed by community! Never sizes them or positions them through the view hierarchy for your view hierarchy for your projects for this to. Murder laws are governed by the view from your app delegate programmatic UI do... And Assign it to create your view controller does not have an nib... Loginview which for simplicity only contains 2 UILabels trivial or 2. ) 90 % of its amperage rating additional... `` nearest/minimum/closest image '' even come into the discussion of molecular simulation setting autoresizingMasks can be a candidate an! The underlying UIActivityViewController but that feels unnecessary please note you will need to know why crash. Paroled/On probation override it to a custom view controller to nil using Mike W. 's answer: it looks are...