When user enters in a textfield, is the input of textfield gets stored in a String ? If yes, then String in swift being immutable, as user keeps on typing does new memory for storing that text gets allocated with each key stroke ? And when we read users input by using delegate method textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) from textfield.text, we get users input in a String. Is it same storage as used by textfield for storing the user input on key stroke or is it some other storage with copy of the user's input in it? Or is UItextfield using a diffrent data structure (buffer) for storing the user input and when we do textfield.text, it gives a copy of data stored in original buffer?

When call: [UITabBarController setViewControllers:animated:] It crashed and raise an Fatal Exception: Fatal Exception: NSInternalInconsistencyException Attempting to select a view controller that isn't a child! (null) the crash stack is: Fatal Exception: NSInternalInconsistencyException 0 CoreFoundation 0x8408c __exceptionPreprocess 1 libobjc.A.dylib 0x172e4 objc_exception_throw 2 Foundation 0x82215c _userInfoForFileAndLine 3 UIKitCore 0x38a468 -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] 4 UIKitCore 0x3fa8a4 -[UITabBarController _setSelectedViewController:performUpdates:] 5 UIKitCore 0x3fa710 -[UITabBarController setSelectedIndex:] 6 UIKitCore 0x8a5fc +[UIView(Animation) performWithoutAnimation:] 7 UIKitCore 0x3e54e0 -[UITabBarController _setViewControllers:animated:] 8 UIKitCore 0x45d7a0 -[UITabBarController setViewControllers:animated:] And it appear sometimes, what's the root cause?

If I have a Catalyst app with a WKWebView and I select text, I can drag forward to extend the selection, but I can't reduce the length of the selected range by dragging backwards. I've reproduced this in a trivial sample app. Is there some property I need to set somewhere? I've filed this as FB15645411.

Our tvOS app makes use of top shelf Carousel style slides to promote our content. We would like to detect when tvOS transitions between individual top shelf slides, regardless of whether the slide transition is made by a user (via the Siri remote), or by the system idle auto-transition. Has anyone achieved this, maybe there are undocumented system hooks or events we can listen to?

Some crashes were found, not many, but we could not locate the specific code because the error stack is a systematic method. Error: NSInternalInconsistencyException Failed to create remote render context Stack: 0 CoreFoundation 0x000000018a879d78 ___exceptionPreprocess + 220 1 libobjc.A.dylib 0x00000001a34de734 _objc_exception_throw + 60 2 Foundation 0x000000018c0ff358 -[NSMutableDictionary(NSMutableDictionary) initWithContentsOfFile:] + 0 3 UIKitCore 0x000000018d475f8c ___UIKIT_DID_NOT_RECEIVE_A_REMOTE_CACONTEXT_FROM_COREANIMATION_INDICATING_A_POSSIBLE_BACKBOARDD_CRASH + 572 4 UIKitCore 0x000000018d232484 ___UIKIT_IS_REQUESTING_A_CACONTEXT_FROM_COREANIMATION + 80 5 UIKitCore 0x000000018d1fc32c +[_UIContextBinder createContextForBindable:withSubstrate:] + 708 6 UIKitCore 0x000000018d13bdec -[_UIContextBinder _contextForBindable:] + 148 7 UIKitCore 0x000000018cf5bd20 -[_UIContextBinder updateBindableOrderWithTest:force:] + 480 8 UIKitCore 0x000000018d2e1200 -[_UIContextBinder createContextsWithTest:creationAction:] + 92 9 UIKitCore 0x000000018ccd64c0 -[UIWindowScene _prepareForResume] + 156 10 UIKitCore 0x000000018ce2ef80 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:] + 876 11 UIKitCore 0x000000018ce72528 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:] + 288 12 UIKitCore 0x000000018cdfc8c8 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:] + 476 13 FrontBoardServices 0x000000019c9dbe18 -[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:] + 528 14 FrontBoardServices 0x000000019c9f413c ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2 + 152 15 FrontBoardServices 0x000000019c9d9308 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 240 16 FrontBoardServices 0x000000019c9df824 ___94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke + 396 17 libdispatch.dylib 0x000000018a4e0a2c __dispatch_client_callout + 20 18 libdispatch.dylib 0x000000018a4e44e0 __dispatch_block_invoke_direct + 264 19 FrontBoardServices 0x000000019c9dac70 ___FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 48 20 FrontBoardServices 0x000000019c9da040 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 220 21 FrontBoardServices 0x000000019c9de700 -[FBSSerialQueue _performNextFromRunLoopSource] + 28 22 CoreFoundation 0x000000018a89bf04 ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 23 CoreFoundation 0x000000018a8acc90 ___CFRunLoopDoSource0 + 208 24 CoreFoundation 0x000000018a7e6184 ___CFRunLoopDoSources0 + 268 25 CoreFoundation 0x000000018a7ebb4c ___CFRunLoopRun + 828 26 CoreFoundation 0x000000018a7ff6b8 _CFRunLoopRunSpecific + 600 27 GraphicsServices 0x00000001a6899374 _GSEventRunModal + 164 28 UIKitCore 0x000000018d164e88 -[UIApplication _run] + 1100 29 UIKitCore 0x000000018cee65ec _UIApplicationMain + 364 30 ??? 0x00000001059b9ce4 0x00000001059b9ce4 + 0 These crashes occurred when the App was about to enter the foreground. (UIApplicationWillEnterForegroundNotification) These crashes occurred on systems from 15 to 18. crash.log

The Problem When transitioning between view controllers that each have their own MTKView but share a Metal renderer backend, we run into delegate ownership conflicts. Only one MTKView can successfully render at a time, since setting the delegate on one view requires removing it from the other, leading to paused views during transitions. For my app, I need to display the same visuals across multiple views and have them all render correctly. Current Implementation Approach I've created a container object that manages the MTKView and its relationship with the shared renderer: class RenderContainer { let metalView: MTKView private let renderer: MetalRenderer func startRendering() { metalView.delegate = renderer metalView.isPaused = false } func stopRendering() { metalView.isPaused = true metalView.delegate = nil } } View controllers manage the rendering lifecycle in their view appearance methods: override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) renderContainer.startRendering() } override func viewWillDisappear(_ animated: Bool) { super.viewWillDisappear(animated) renderContainer.stopRendering() } Observations & Issues During view controller transitions, one MTKView must stop rendering before the other can start. Also there is no guarantee that the old view will stop rendering before the new one starts, with the current API design. This creates a visual "pop" during animated transitions Setting isPaused = true helps prevent unnecessary render calls but doesn't solve the core delegate ownership problem The shared renderer maintains its state but can only output to one view at a time Questions What's the recommended approach for handling MTKView delegate ownership during animated transitions? Are there ways to maintain visual continuity without complex view hierarchies? Should I consider alternative architectures for sharing the Metal content between views? Any insights for this scenario would be appreciated.

I have an iOS App which looks great on iPhone, portrait only, which makes a lot of use of UITableViews. On iPad those tables look stretched out in Landscape. On MacOS with Apple Silicon the app can be resized to any size and the table views look very stretched. There are views in the App which users want to resize so limiting app size not an option. I've been modifying the app's table views to limit their width and centre them using constraints. This isn't easy, it's a lot of work as UITableViewController doesn't allow for constraining the table width. Or does it? So I've changed them to UIViewControllers with UITableView imbedded in the root UIView with constraints. Looks really nice. Now I've just run into the limitation that static tables, which I have a number of, aren't allowed to be embedded. So how can I limit the width of them? I really don't want to add a lot of dynamic code. Please tell me there's an simpler, more elegant method to what really makes a much more aesthetically pleasing UI on iOS App running on iPad and MacOS? TIA!

I have a swiftui view with Button(intent: ) and using UIHostingViewcontroller to use it in UIKit. The problem is that button not works in uikit but normal button(without intent works)

Following instructions from ChatGPT, I'm trying to rearrange the order of rows in a UITableView. - (void)tableView:(UITableView *)tableView performDropWithCoordinator:(id<UITableViewDropCoordinator>)coordinator { NSIndexPath *destinationIndexPath = coordinator.destinationIndexPath ?: [NSIndexPath indexPathForRow:self.items.count inSection:0]; [tableView performBatchUpdates:^{ for (UITableViewDropItem *dropItem in coordinator.items) { NSString *movedItem = dropItem.dragItem.localObject; if (movedItem) { NSIndexPath *sourceIndexPath = dropItem.sourceIndexPath; if (sourceIndexPath) { [self.items removeObjectAtIndex:sourceIndexPath.row]; [self.items insertObject:movedItem atIndex:destinationIndexPath.row]; [tableView moveRowAtIndexPath:sourceIndexPath toIndexPath:destinationIndexPath]; } } } } completion:nil]; } Xcode is complaining that UITableViewDropItem does not exist. The class is in all the documentation, it is just not showing up when needed! Suggestions?

xcode16,iphone16,iOS 自定义navigationItemLeftBar,设置 navigationController?.interactivePopGestureRecognizer?.delegate = self，侧划返回一半，点击屏幕，界面卡死。 18系统之前的手机，或者非iphone16的手机没有问题。

Hi, I'm trying to create a UICollectionView where the cell high is automatic. Cells contains a UILabel with all anchors to the contentView of the cell. It seems to work but I have a strange behavior with longer text, on reload data and on device rotation: Cells do not display the whole text or they change row, both randomly. To create my collection view I first create the collection view with a custom flow layout setting the automatic size on viewWillAppear: let collectionViewFlowLayout = CustomFlowLayout() collectionViewFlowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize collectionView = UICollectionView(frame: .zero, collectionViewLayout: collectionViewFlowLayout) and I have also overridden: override func willAnimateRotation(to toInterfaceOrientation: UIInterfaceOrientation, duration: TimeInterval) { collectionView.setNeedsLayout() self.collectionView.layoutIfNeeded() self.collectionView.collectionViewLayout.invalidateLayout() //self.collectionView.reloadData() } Then, I created the custom layout as follow: import UIKit final class CustomFlowLayout: UICollectionViewFlowLayout { override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? { let layoutAttributesObjects = super.layoutAttributesForElements(in: rect)?.map{ $0.copy() } as? [UICollectionViewLayoutAttributes] layoutAttributesObjects?.forEach({ layoutAttributes in if layoutAttributes.representedElementCategory == .cell { if let newFrame = layoutAttributesForItem(at: layoutAttributes.indexPath)?.frame { layoutAttributes.frame = newFrame } } }) return layoutAttributesObjects } override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? { guard let collectionView = collectionView else { fatalError() } guard let layoutAttributes = super.layoutAttributesForItem(at: indexPath)?.copy() as? UICollectionViewLayoutAttributes else { return nil } layoutAttributes.frame.origin.x = sectionInset.left if(indexPath.section == 0){ layoutAttributes.frame.size.width = collectionView.safeAreaLayoutGuide.layoutFrame.width - sectionInset.left - sectionInset.right } else if (indexPath.section == collectionView.numberOfSections - 1){ let width = ScreenUtility.getCollectionCellWidthForElement(in: collectionView, sectionLeft: sectionInset.left, sectionRight: sectionInset.right, minimumInteritemSpacing: minimumInteritemSpacing, multiplier: 3) layoutAttributes.frame.origin.x = ScreenUtility.getCollectionCellOriginForElement(in: collectionView, at: indexPath, forElementHavingWidth: width, sectionLeft: sectionInset.left, sectionRight: sectionInset.right, minimumInteritemSpacing: minimumInteritemSpacing, multiplier: 3) layoutAttributes.frame.size.width = width } else if (indexPath.section == collectionView.numberOfSections - 3) || (indexPath.section == collectionView.numberOfSections - 4){ let width = ScreenUtility.getCollectionCellWidthForElement(in: collectionView, sectionLeft: sectionInset.left, sectionRight: sectionInset.right, minimumInteritemSpacing: minimumInteritemSpacing) layoutAttributes.frame.origin.x = ScreenUtility.getCollectionCellOriginForElement(in: collectionView, at: indexPath, forElementHavingWidth: width, sectionLeft: sectionInset.left, sectionRight: sectionInset.right, minimumInteritemSpacing: minimumInteritemSpacing) layoutAttributes.frame.size.width = width } else { let width = ScreenUtility.getCollectionCellSizeForElementFullRow(in: collectionView, sectionLeft: sectionInset.left, sectionRight: sectionInset.right) layoutAttributes.frame.origin.x = ScreenUtility.getCollectionCellOriginForElementFullRow(in: collectionView, sectionLeft: sectionInset.left, sectionRight: sectionInset.right) layoutAttributes.frame.size.width = width } return layoutAttributes } } And finally on collection view cells: override func preferredLayoutAttributesFitting(_ layoutAttributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes { setNeedsLayout() layoutIfNeeded() let targetSize = CGSize(width: layoutAttributes.frame.width, height: 0) layoutAttributes.frame.size = contentView.systemLayoutSizeFitting(targetSize, withHorizontalFittingPriority: .required, verticalFittingPriority: .fittingSizeLevel) return layoutAttributes } override func prepareForReuse() { self.nameLabel.text = "" self.idLabel.text = "" self.contentView.setNeedsLayout() self.contentView.layoutIfNeeded() } Let me show you an example on the iPad that is the worst. First Time I open the collection view I have cells on wrong rows and not sized properly Then I rotate the device portrait and the cells are fine On landscape again it changes behavior: This is just an example, things happens apparently randomly, and also sometimes cells disappear (I think the height is set to 0). I really do not understand why, cells width seems to be computed correctly, and cell label is set via setter: open var step: String = "" { didSet { nameLabel.text = step nameLabel.sizeToFit() self.contentView.setNeedsLayout() self.contentView.layoutIfNeeded() } }

I'm working on integrating the new format panel shown in the WWDC24 session "What's New in UIKit" under the Text Improvements section. So far, I've implemented long-press functionality on a text passage, allowing the editing options to appear. From there, you can go to Format > More..., which successfully opens the new format panel. However, I would also like to add a button to programmatically display this format panel—similar to how the Apple Notes app has a button in the keyboard toolbar to open it. Does anyone know how to achieve this? Here's my current code for the text editor (I've enabled text formatting by setting allowsEditingTextAttributes to true): struct TextEditorView: UIViewRepresentable { @Binding var text: String func makeCoordinator() -> Coordinator { Coordinator(self) } func makeUIView(context: Context) -> UITextView { let textEditorView = UITextView() textEditorView.delegate = context.coordinator textEditorView.allowsEditingTextAttributes = true return textEditorView } func updateUIView(_ uiView: UITextView, context: Context) { uiView.text = text } class Coordinator: NSObject, UITextViewDelegate { var parent: TextEditorView init(_ uiTextView: TextEditorView) { self.parent = uiTextView } func textViewDidChange(_ textView: UITextView) { self.parent.text = textView.text } } } Thanks in advance for any guidance!

In a UITabBarController, its controllers are set to be UINavigationControllers. When programmatically setting the selectedViewController to a desired controller which is not currently displayed, the selected icon is correct however the actual view controller is still the previously selected. Pseudo code: tabController.controllers = [viewcontroller1, viewcontroller2, viewcontroller3].map{ UINavigationController(rootViewController: $0) } .... // let's say at some point tab bar is set to e.g. showing index 1 tabController.selectedController = tabController.controllers[0] // after this the icon of the 1st tab is correctly displayed, but the controller is still the one at index 1 I have noticed that if the controllers are simple UIViewController (not UINavigationController) upon setting the selectedViewController the TabController sets both icon and content correctly. But this is not the wanted setup and different UINavigationControllers are needed. Is this a new bug in iOS18? Any idea how to fix this (mis)behaviour?

code: let action1 = UIAction(title: "Restore".localized, image: UIImage(resource: .listRestore)) { [weak self] action in self?.trashRestoreTapped(id: button.tag) } let action2 = UIAction(title: "Delete".localized, image: UIImage(resource: .listDelete), attributes: [.destructive]) { [weak self] action in self?.trashDeleteTapped(id: button.tag) } button.menu = UIMenu(options: .displayInline, preferredElementSize: .large, children: [action1, action2]) button.showsMenuAsPrimaryAction = true MacOS 15.1: iPad:

We recently converted an existing app to adopt scenes (for CarPlay). The app has one main view controller that presents a WKWebView to show our content. Everything works fine in both landscape and portait mode when swiping on the screen to scroll. But with an iPad using an external Magic Keyboard, once you rotate to landscape mode the scrolling gestures are reversed. Swiping vertically on the trackpad is scrolling the page horizontally and vice versa. When this happens an error like below is logged (this error also shows up when in portait mode, but scrolling works as expected): Unexpected window orientation: <UIWindow: 0x10370d8f0; orientation: landscapeLeft (4)> { hidden = NO; frame = {{0, 0}, {1180, 820}}; bounds = {{0, 0}, {1180, 820}}; ownsOrientation = NO; ownsOrientationTransform = NO; autorotationDisabled = NO; windowInterfaceOrientation = unknown (0); rootTransformOrientation = landscapeLeft (4); viewTransformOrientation = unknown (0); autorotationDisabled = NO; orientationVC = ... { providedSupportedOrientations = ( Pu Ll Lr Pd ); resolvedSupportedOrientations = ( Pu Ll Lr Pd ); canPreferOrientation = NO; }; }, event type: 6 It seems to suggest that while the view controller orientation is set correctly. It doesn't know what the orientation is for the window. I have been unable to figure out what would change with adopting scenes that would explain this behavior. I assume it has to do with the potential multi-window nature of it but haven't found any docs that describe how to ensure the window is setup to use the same orientation as the device. Any suggestions on things to check?

Hello bro, I create a custom button like this way: UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.titleLabel.font = [UIFont fontWithName:fontName size:fontSize]; Then I receive any issue from the third crash collection platform: 0 libobjc.A.dylib 0x000000018fd1e694 _objc_moveWeak + 196 1 libobjc.A.dylib 0x000000018fd1e694 _objc_moveWeak + 196 2 CoreFoundation 0x0000000197e7da94 __CFXNotificationRegistrarAddObserver + 392 3 CoreFoundation 0x0000000197e7c864 _CFXNotificationRegistrarAdd + 580 4 CoreFoundation 0x0000000197e7c040 __CFXNotificationRegisterObserver + 248 5 UIKitCore 0x000000019a1b6c98 _UILabelCommonInit + 188 6 UIKitCore 0x000000019a1b69fc -[UILabel _commonInit] + 520 7 UIKitCore 0x000000019a1cdf88 -[UILabel initWithFrame:] + 56 8 UIKitCore 0x000000019a24824c -[UIButtonLabel _initWithFrame:button:] + 100 9 UIKitCore 0x000000019a247c14 -[UIButtonLegacyVisualProvider _newLabelWithFrame:] + 84 10 UIKitCore 0x000000019a15ee80 -[UIButtonLegacyVisualProvider _setupTitleViewRequestingLayout:] + 84 11 UIKitCore 0x000000019a15d81c -[UIButtonLegacyVisualProvider titleViewCreateIfNeeded:] + 44 12 UIKitCore 0x000000019a1cfa78 -[UIButton titleLabel] + 36 So would you please tell me how to avoid it?

we are migrating our app to support Arabic language support but the requirement is we want the calendar/date object to display as missed. That is all the numbers in english digits and rest all the words like days, months should be in Arabic. I tried few options but at the end its resulting everything is in Arabic or in English but not the mixed as expected. Attaching the expected behavior.

在webview全屏打开Video视频前后获取设备的宽高结果不同 [UIScreen mainScreen].bounds对应的设备逻辑分辨率发生变化，导致根据分辨率显示的页面显示错误

I'm currently migrating a midsize (20k LOC) project to Swift structured concurrency. With complete checking turned on, it currently builds with only two warnings, both of which are related to the QLPreviewControllerDelegate protocol: "Main actor-isolated instance method 'previewControllerDidDismiss' cannot be used to satisfy nonisolated protocol requirement; this is an error in the Swift 6 language mode" as well as the same warning but substituting 'previewController(_:transitionViewFor:)' for the method name. I'm confused as to how to make these nonisolated, as they use UIKit classes/subclasses as arguments and/or return types.

Only IOS 18+ bug. After tap share on UIPrintInteractionController - crash. So: #0 0x00000001bc38edf4 in _realizeSettingsExtension.cold.5 () #1 0x00000001bc310ed0 in _realizeSettingsExtension () #2 0x00000001bc33d100 in _ingestPropertiesFromSettingsSubclass () #3 0x00000001bc33be50 in __FBSIngestSubclassProperties_block_invoke () #4 0x00000001bc33bd7c in FBSIngestSubclassProperties () #5 0x00000001bc33d814 in FBSSettingForLegacySelector () #6 0x00000001bc30ecf8 in FBSSettingForSelector () #7 0x00000001bc350d98 in -[FBSMutableSceneSettings addPropagatedProperty:] () #8 0x00000001a64bae88 in __58-[_UISceneHostingController createSceneWithConfiguration:]_block_invoke_3 () #9 0x00000001c5bc16ec in -[FBScene _joinUpdate:block:completion:] () #10 0x00000001a64bab9c in -[_UISceneHostingController createSceneWithConfiguration:] () #11 0x00000001a64ba838 in -[_UISceneHostingController initWithAdvancedConfiguration:] () #12 0x00000001a64ba8cc in -[_UISceneHostingController initWithProcessIdentity:sceneSpecification:] () #13 0x00000001c05a8bd0 in -[SHSheetRemoteScene setupSceneHosting] () #14 0x00000001c05a88d0 in -[SHSheetRemoteScene activate] () #15 0x00000001c05f2e88 in -[SHSheetInteractor startSession] () #16 0x00000001c05ebc08 in -[SHSheetPresenter initWithRouter:interactor:] () #17 0x00000001c05de3c8 in +[SHSheetFactory createMainPresenterWithContext:] () #18 0x00000001c05d4dec in -[UIActivityViewController _createMainPresenterIfNeeded] () #19 0x00000001c05d6320 in -[UIActivityViewController _viewControllerPresentationDidInitiate] () #20 0x00000001a5a109c4 in -[UIViewController _presentViewController:withAnimationController:completion:] () #21 0x00000001a5a1311c in __63-[UIViewController _presentViewController:animated:completion:]_block_invoke () #22 0x00000001a5a0d248 in -[UIViewController _performCoordinatedPresentOrDismiss:animated:] () #23 0x00000001a5a0ceb4 in -[UIViewController _presentViewController:animated:completion:] () #24 0x00000001a5a0ccc0 in -[UIViewController presentViewController:animated:completion:] () #25 0x00000002001f3660 in -[UIPrintPanelViewController showSharePanelForPDFURL:] () In log throwing an error (I'm not 100% sure that is related - but last class in stack trace the same): failure in void _realizeSettingsExtension(__unsafe_unretained Class, __unsafe_unretained Class) (FBSSceneExtension.m:502) : could not convert "1" to an integer What I have is that big project with a lot of dependencies and etc.. Trying on clear project and it worked. (sharing simple local image with url). Testing on my project: With no controllers at all - check. With different approaches (htm content; pdf data, image local url) - check. With UIActivityViewController - check With day of UIPrintInteractionController creation (not a thread/related issue) - check. No other work can be done from my side (except rewrite 10years project). Help me please to debug it from private api prospective as I have no Idea what is happening. (trying to remove all appearances and all dependency - not easy task). Thanks