When minimize an app on extended display, then plug out the extended display, the app crashes. These simple steps, make every iOS app running on Mac crash. Pls fix it.

I first applied a snapshot on the main thread like this: var snapshot = NSDiffableDataSourceSnapshot<Section, MessageViewModel>() snapshot.appendSections([.main]) snapshot.appendItems([], toSection: .main) dataSource.applySnapshotUsingReloadData(snapshot) After loading data, I applied the snapshot again using: Task { @MainActor in await dataSource.applySnapshotUsingReloadData(snapshot) } On an iPhone 13 mini, I received the following warning: Warning: applying updates in a non-thread confined manner is dangerous and can lead to deadlocks. Please always submit updates either always on the main queue or always off the main queue However, this warning did not appear when I ran the same code on an iPhone 16 Pro simulator. Can anyone explain it to me? Thank you

Is there any possibility to update constraints for elements inside CollectionViewCell with button tap? And where to put the code inside CellForItem or Inside CollectionViewCell Class File?

SwiftUI, using LPLinkView through UIViewRepresentable. Default behavior is a long press brings up a context menu and a popover to preview content. I want to replace that default long press behavior with my own custom screen. Adding a UILongPressGestureRecognizer didn't work. Thanks!

When running UITests on tvOS, tabBar viewIdentifiers (UIKit) are no longer appearing. When you run the test, accessibility identifiers for tabs are no longer locatable but all other identifiers appears except for the tabs in the tabBar. In the stack trace of the debugger, if I print application, I can see all existing viewIdentifiers except those that were set for the tabs (on tvOS only). If I force an action on the simulator after the app has launched and the view appeared ie move left or right, the identifiers appears (confirmed by stack trace) and the test will continue as expected. This was not an issue in the past (no code changes). I am not sure if this appeared after updating my mac to Sequoia. But for iOS, there is no issue. This bug only appears on tvOS and specifically the tabs. Issue persists on: Sequoia 15.4.1 Xcode 16.3

I'm looking for a reliable way to detect when the UIScreen of a UIView changes. I'm developing a renderer SDK that provides a custom UIView subclass which performs OpenGL / Metal rendering, driven by a CADisplayLink. To support scenarios like screen mirroring or external displays on iPad, I need to ensure the CADisplayLink is created using the correct UIScreen, so the refresh rate is accurate. Ideally, I’d like a way to be notified in the view itself (without requiring scene delegate integration) whenever self.window.windowScene.screen changes, even if trait values remain the same. Any ideas or workarounds that work safely in production would be hugely appreciated! Since iOS 13, the architecture is: The app can have multiple UIScene instances (typically UIWindowScene). Each UIWindowScene can have multiple UIWindows. Each UIWindow hosts a view hierarchy. To determine the correct UIScreen, I access self.window.windowScene.screen. If any component in that key path changes (window, windowScene, or screen), I need to detect it and react. Here’s what I’ve tried so far: Overriding willMoveToWindow: and didMoveToWindow: This allows me to detect changes to window, but if windowScene (of the window) or screen (of the scene) changes directly, I get no notification. Overriding traitCollectionDidChange: This works if the screen change causes a difference in traits (e.g., a different displayScale), but fails if the old and new screens share the same traits (e.g., identical scale). Listening to UIScene-related notifications Notifications like UISceneDidDisconnectNotification or UISceneWillEnterForegroundNotification only indicate scene lifecycle events, not that a particular view or window has moved to a different screen. Using KVO to observe self.window.windowScene.screen I found WebKit does something similar, but in practice this causes crashes. The error message suggests that "windowScene" is not KVO-compliant, and my experience confirms it's not safe in production. Apple's official guidance uses UIWindowSceneDelegate In this example, Apple shows how to update a CADisplayLink in a UIWindowSceneDelegate's windowScene:didUpdateCoordinateSpace:interfaceOrientation:traitCollection:. However, as an SDK provider delivering just a UIView, I don't have control over the host app's UIWindowSceneDelegate.

I see viewIsAppearing is available on iOS 13 and above, but when I use it, found that the function not be called below iOS 16 https://developer.apple.com/documentation/uikit/uiviewcontroller/4195485-viewisappearing environment: Macos 14.4.1, Xcode 15.3 import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let sub = SubViewController() addChild(sub) view.addSubview(sub.view) } @available(iOS 13.0, *) override func viewIsAppearing(_ animated: Bool) { super.viewIsAppearing(animated) print("ViewController viewIsAppearing") } } class SubViewController: UIViewController { @available(iOS 13.0, *) override func viewIsAppearing(_ animated: Bool) { super.viewIsAppearing(animated) print("SubViewController viewIsAppearing") } } In iOS 15 devcice console log: ViewController viewIsAppearing iOS 16, 17: ViewController viewIsAppearing SubViewController viewIsAppearing

I have a SwiftUI app which needs the Ivanti AppConnect SDK. The docs only show how to integrate it into a Swift/UIKit app. But I need it to work with SwiftUI. I probably could make a UIKit base app and then load my existing SwiftUI views and code through a SwiftUI component host or something. But I'd like to avoid that if possible. Here is where I'm stuck: The AppConnect framework loads through a custom UIApplication subclass in the main.swift file: import Foundation import AppConnect UIApplicationMain( CommandLine.argc, CommandLine.unsafeArgv, ACUIApplicationClassName, NSStringFromClass(AppDelegate.self) ) The startup works as expected, and the expected function is called in the AppDelegate class: func application( _ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {...} However, the SwiftUI view is not loaded and the scree stays blank. I implemented a SceneDelegate.swift class which doesn't seem to be called. Also, the following function in the AppDelegate doesn't get called either: func application( _ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {...} So how do I bootstrap SwiftUI with a custom UIApplication class? can that be done with the @main macro somehow? I'm still pretty new to Swift and iOS development. Any help is appreciated

My app is a camera app that supports Picture-in-Picture (PiP) mode. Normally, when the device rotates, I get the device orientation from iOS and use it to rotate the camera feed so that the preview stays correctly aligned. However, when the app enters PiP mode, it is considered to be in the background, and I can no longer receive orientation updates from the system. As a result, I can’t apply rotation corrections to the camera video in PiP mode. Is there any way to retrieve device orientation while the app is in the background (specifically during PiP mode)? Any guidance would be greatly appreciated. Thank you!

I have a SwiftUI view that I have wrapped using UIHostingController for use within UIKit. Requirement: Within the UIKit environment, I want to get all the subviews of this SwiftUI view and determine whether the images within those subviews have finished loading. For UIKit views, we can use view.subviews to get all the subviews and do the check. However, for SwiftUI views, I found that the view.subviews turns out to be an empty array, making it impossible to do further checks. So the question is How can I get the subviews of a SwiftUI view?

For now, my app name length is more than 20 characters, so the iPhone app name displays without a space, and uses the range operator to ensure showing the rest in the next line. Is it possible to show space and name with 2 lines?

The badge is cut if it's assigned to the last item. Is it a known issue? Thank you.

I've been teaching myself Objective-C and I wanted to start creating projects that don't use ARC to become better at memory management and learn how it all works. I've been attempting to build and run applications, but I'm not really sure where to start as modern iOS development is used with Swift and memory management is handled. Is there any way to create modern applications that use Objective-C, UIKit, and not use ARC?

Hello, We are experiencing some issues with our USB accessory unexpectedly charging the iOS device it is connected with only when the iOS device supports USB-C and is on iOS 18+ The following is a description of the discrepancy we note between iOS versions: After performing a USB Role switch, our Accessory becomes a typical USB Device and the Apple device becomes the USB host. with iOS 17: 
 The Accessory then sends a PowerSourceUpdate message to the iOS 17 device via iAP2 protocol. Apple device has a USB Type C Connector. * We are specifying: AvailableCurrentForDevice = 0 mA  DeviceBatteryShouldChargeIfPowerIsPresent = 1. Three observations: iPad Battery Settings page -  we observe  'Last charged to…' (indicating no charging) On the Lumify App running (iOS 17), we observe that UIKit.current.batteryState indicated 'Not charging' Battery icon on top right of the screen indicates 'No Charging' with iOS 18: The same Accessory sends the same PowerSourceUpdate message to the iOS 18 device via iAP2 protocol using USB Type C Connector. We are specifying the same: AvailableCurrentForDevice = 0 mA DeviceBatteryShouldChargeIfPowerIsPresent = 1. We observe: iPad Battery Settings page -  we observe  'Charging'  On the Lumify App running (iOS 18), we observe that UIKit.current.batteryState indicated 'Charging' Battery icon on top right of the screen indicates 'No Charging' Please could you help us understand why the Battery status is showing as 'Charging' in the Settings page and with the 'UIKit.current.batteryState' even though we have specified 'AvailableCurrentForDevice = 0 mA'?
 Since our accessory is heavily reliant on the Battery status / Charging state, is there potentially another way we get an accurate battery charging status that we are missing? Or are there other suggestions outside of what we do currently to ensure our accessory does not place the iOS18 device into a charging state?

I have recently submitted a new app version to the Appstore with Xcode 15.0. Unfortunately, I have started to see the below crash in the Xcode organiser &gt; Crashes section occurring for more number of times. UIKitCore: +[UIAlertController _alertControllerContainedInViewController:] + 160 The exception trace is not leading to main() function but not pointing to any of the code line. I had used UIAlertController in the past versions to show the alerts but there is no code written in the current version code related to UIAlertController. Only from the latest version, this kind of crash started to surface. In the latest release, We have added a third party SDK and while implementing the SDK, we had added the Location and Bluetooth Permissions in Info.plist file. But as we don't want to use/track the Location and Bluetooth details from the app, the SDK team has disabled the Location and Bluetooth settings to not reflect in the tracked data. Is this behaviour creating any conflict with the UIAlertController and logging the crash? Because by default the OS tries to show the alert when the permissions exist in the plist file, but the alert will not come as the service is disabled on the SDK server settings. Is this creating any conflict and logging the crash. Please extend your help.

I have a button with the following properties: accessibilityLabel: "Action Button", traits: "Button", accessibilityHint: "Performs the main action". The voiceover reads the button as follows: Action Button, Button, Performs the main action. I want to understand how to configure it to only speak the accessibilityHint or only the accessibilityLabel and never speak the traits. In another example, a switch has the traits: Button, and Toggle. So these traits are a part of what the voiceover speaks. I want only the accessibilityLabel or accessibilityHint to be spoken in this case. Please let me know how. Thanks

Introduction Hello, As part of our ongoing migration to SwiftUI, we are currently managing navigation using UIKit. Our SwiftUI views are embedded in UIHostingController instances and pushed or presented via UINavigationController. We’ve encountered an issue that causes either a UI glitch on iOS 18 or a crash on iOS 17 when using the .refreshable modifier in a SwiftUI view that is added to a UINavigationController via setViewControllers(_:animated:). To reproduce the issue, we’re using the following simple SwiftUI view: struct TestView: View { var body: some View { List { ForEach(0...100, id: \.self) { Text("Number: \($0)") } } .refreshable { // No action needed — the presence of this modifier alone triggers the issue } } } Problematic Scenario The following code causes the issue: class ViewController: UIViewController { override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) let initialNav = self.navigationController let hostingController = UIHostingController(rootView: TestView()) let newNav = UINavigationController() // This causes a freeze (iOS 18) or crash (iOS 17) newNav.setViewControllers([hostingController], animated: true) initialNav?.present(newNav, animated: true) } } After presenting the navigation controller, our app is freezing on iOS 18 or crashing on iOS 17. Working scenario When using pushViewController(_:animated:), the issue does not occur: class ViewController: UIViewController { override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) let initialNav = self.navigationController let hostingController = UIHostingController(rootView: TestView()) let newNav = UINavigationController() // This works without issue newNav.pushViewController(hostingController, animated: true) initialNav?.present(newNav, animated: true) } } Conclusion We would like to better understand the root cause of this behavior. While using pushViewController is a viable workaround, there are scenarios where we must rely on setViewControllers, and currently, that approach breaks the experience or crashes the app. Is this a known issue, or are we missing something about how UIHostingController interacts with .refreshable in this context? Thanks for your time — we look forward to any insights you can share.

I have find out that a UIViewRepresentable, even with a simples UIView, seems to never be dismantled when deleted from a ForEach and this can cause serious crashes. In the following example you can observe this behavior by deleting a row from the list. The dismantleUIView function of SomeUIViewRepresentable or the deinit of SomeUIView are never called. Has anyone faced this and found a solution for it? I have also filled a Feedback: FB11979117 class SomeUIView: UIView {     deinit {         print(#function)     } } struct SomeUIViewRepresentable: UIViewRepresentable {     func makeUIView(context: Context) -> SomeUIView {         let uiView = SomeUIView()         uiView.backgroundColor = .systemBlue         return uiView     }     func updateUIView(_ uiView: SomeUIView, context: Context) { }     static func dismantleUIView(_ uiView: SomeUIView, coordinator: Coordinator) {         print(#function)     } } struct Model: Identifiable {     let id = UUID() } struct ContentView: View {     @State var models = [Model(), Model(), Model(), Model(), Model()]     var body: some View {         List {             ForEach(models) { _ in                 SomeUIViewRepresentable()             }             .onDelete {                 models.remove(atOffsets: $0)             }         }     } }

I am trying to do inline to icon and text in tab bar but it is not allowing me to do it in compact, but it showing me in regular mode , but in regular mode tab bar going at top in portrait mode , But my requirement is tab bar required in bottom with icon and text in inline it showed by horizontally but it showing to me stacked vertically, will you guide me on this so that I can push the build to live users.

Seeing this magical sand table, the unfolding and folding effects are similar to spreading out cards, which is very interesting. But I don't know how to achieve it. I want to see if there are any ways to achieve this effect and give some ideas. May I ask if this effect can be achieved under the existing API