Hi!I hope someone can help me.A user told me that my app crashes when scrolling a tableView on iOS 13.1.2.I received the crash log and the error it’s just crazy.The crash log indicate that the error is at the first line inside the trailingSwipeActionsConfigurationForRowAt method.override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? { guard items.count > indexPath.row else {return nil} //This line crash. … }The items property is defined as:private var items = [AnyObject]()The error is EXC_BREAKPOINT (SIGTRAP).How can this line of code crash? items is a non optional variable and indexPath is also a non optional struct.It's as if indexPath.row was deliberately creating an EXC_BREAKPOINT exception. It is possible?Another strange thing is that the user say that the app crash during scrolling. It seems that the method trailingSwipeActionsConfigurationForRowAt is called during scroll. That's also strange, it should not be called only when the user does a left swipe? Maybe it has something to do with some accessibility feature because in the call stack of crash report I see some system accessibility methods calls (see crash report below).Has anyone any ideas that can help me or has encountered a similar problem?Thank youException Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000001, 0x00000001de522a94 Termination Signal: Trace/BPT trap: 5 Termination Reason: Namespace SIGNAL, Code 0x5 Terminating Process: exc handler [1431] Triggered by Thread: 0 Thread 0 name: Thread 0 Crashed: 0 libswiftUIKit.dylib 0x00000001de522a94 $s10Foundation9IndexPathV5UIKitE7sectionSivgTm + 52 1 libswiftUIKit.dylib 0x00000001de522a78 $s10Foundation9IndexPathV5UIKitE7sectionSivgTm + 24 2 MYAPP 0x000000010219ca4c specialized GroupTableViewController.tableView(_:trailingSwipeActionsConfigurationForRowAt:) + 272 (GroupTableViewController.swift:714) 3 MYAPP 0x0000000102194544 @objc GroupTableViewController.tableView(_:trailingSwipeActionsConfigurationForRowAt:) + 136 (:0) 4 UIKitCore 0x00000001ad6ae200 -[UITableView _trailingSwipeConfigurationAtIndexPath:fromRemoveButton:] + 2140 (UITableView.m:16580) 5 UIKit 0x00000001de7889f0 -[UITableViewCellAccessibility _privateAccessibilityCustomActions] + 544 (UITableViewCellAccessibility.m:3153) 6 UIAccessibility 0x00000001b49e6228 -[NSObject(AXPrivCategory) _retrieveCustomActionsForElement:] + 72 (NSObjectAccessibility.m:2973) 7 UIAccessibility 0x00000001b49e650c -[NSObject(AXPrivCategory) _accessibilityCustomActions] + 260 (NSObjectAccessibility.m:3021) 8 UIAccessibility 0x00000001b49e9978 -[NSObject(AXPrivCategory) _accessibilityCustomActionNamesAndIdentifiers] + 68 (NSObjectAccessibility.m:3683) 9 UIAccessibility 0x00000001b49f07bc -[NSObject(AXPrivCategory) _iosAccessibilityAttributeValue:] + 6580 (NSObjectAccessibility.m:6542) 10 UIAccessibility 0x00000001b49d1d9c _copyMultipleAttributeValuesCallback + 544 (UIAccessibilityRuntime.m:344) 11 AXRuntime 0x00000001b39fc834 ___AXXMIGCopyMultipleAttributeValues_block_invoke + 64 (AccessibilityPriv.m:1192) 12 AXRuntime 0x00000001b39fc3a8 _handleNonMainThreadCallback + 68 (AccessibilityPriv.m:467) 13 AXRuntime 0x00000001b39fc6b8 _AXXMIGCopyMultipleAttributeValues + 304 (AccessibilityPriv.m:1191) 14 AXRuntime 0x00000001b39f658c _XCopyMultipleAttributeValues + 396 (AccessibilityClientDefsServer.c:1354) 15 AXRuntime 0x00000001b3a0bd28 mshMIGPerform + 272 (MachServerHelper.c:447) 16 CoreFoundation 0x00000001a939d91c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 60 (CFRunLoop.c:1937) 17 CoreFoundation 0x00000001a939cfe8 __CFRunLoopDoSource1 + 448 (CFRunLoop.c:2075) 18 CoreFoundation 0x00000001a9397c20 __CFRunLoopRun + 2144 (CFRunLoop.c:3098) 19 CoreFoundation 0x00000001a9397098 CFRunLoopRunSpecific + 480 (CFRunLoop.c:3192) 20 GraphicsServices 0x00000001b3501534 GSEventRunModal + 108 (GSEvent.c:2246) 21 UIKitCore 0x00000001ad4b77ac UIApplicationMain + 1940 (UIApplication.m:4753) 22 MYAPP 0x000000010209cae8 main + 68 (PlaceViewController.swift:25) 23 libdyld.dylib 0x00000001a9216f30 start + 4

Hi, I found a case that cause a list to never deselect the row when the back button is pressed. In the following code I modally present a list. When you select a row another list is displayed. If you select a row of the second list and you go back the row will stay selected. This is the code: struct ContentView: View { 		@State var modalVisible = false 		var body: some View { 				Button(action:{ 						self.modalVisible.toggle() 				}) { 						Text("Open modal") 				} 				.sheet(isPresented: $modalVisible) { 						NavigationView { 								List { 										NavigationLink("Item", destination: List { 												NavigationLink("Sub Item", destination: Text("If you go back the row will stay selected.")) 										})                 }             }         }     } } Does anyone know if there is a way to force the list to deselect the row when the back button is pressed? Thank you

Hi, On iOS 13 and iOS 14, if you have a navigation controller that use large titles and you push a controller that does not want a large title (navigationItem.largeTitleDisplayMode = .never) there is a smooth animation between the two navigation bar heights (from the large one to the small one). On iOS 15 the animation is missing and during the transition the pushed controller view top part is covered by the large title bar until the end of the transition. After the animation is done the height of the navigation bar suddenly becomes small. Here's the transition on iOS 14. The navigation bar height gradually changes from large to small: And here's the transition on iOS 15. The navigation bar height is not animated and remains the same until the end of the transition animation: I opened a bug report regarding this issue (FB9290717) but I want to know if someone has found a temporary fix for this. Thank you

Hi, Sometimes it is useful to show a movie to better explain the behaviour of something. Animated gifs would be perfect for this purpose. Unfortunately it doesn't seem possible to include animated gifs in posts. When I try to do it (using the "Add Image" feature) I always got this error message: Will the attachment of animated gifs be supported in the future? If not, what is the recommended way to include a short movie in a post? Thank you

I'm using the following code to get the height of the keyboard: class ViewController: UIViewController {     override func viewDidLoad() {         super.viewDidLoad()         NotificationCenter.default.addObserver(             self,             selector: #selector(keyboardHeight),             name: UIResponder.keyboardDidChangeFrameNotification,             object: nil         )     }     @objc private func keyboardHeight(notification: Notification) {         guard let keyboardRect = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else { return }         print("==> keyboardFrameEndUserInfoKey height: \(keyboardRect.size.height)")     } } This code on iPad work correctly when the keyboard is normal but it does not work when the keyboard is floating. After the user tap on a text field, the keyboard appear and the keyboardDidChangeFrameNotification notification is called. If the keyboard is floating then the first time we get a wrong height of 362. If the user then manually move somewhere the floating keyboard the notification is called again and the correct value of 308 is returned. It is a bug or I miss something? I need to be able to get the correct height the first time the keyboard appear. This is happening on iOS 13 and iOS 14. Any idea?

If we use white as tint color for an inline or compact UIDatePicker (iOS 14, dark mode) then if the today day is selected the number become unreadable. The problem is that the today day number color is always white and, when selected, the background color is also white. Anyone know a way to set the color of today's day number to black when is selected? Thank you

Hi! When using a diffable data source on iOS 13 and iOS 14 in combination with a fetched result controller, the didChangeContentWith method of the NSFetchedResultsController delegate return a new snapshot with inserted, deleted and moved items. Unfortunately, in the new snapshot items that have been modified are not refreshed. That's because the system appears to compare the identifiers to determine whether a refresh is needed or not. If we change an attribute of a Core Data entity the identifier remain the same and the item in the snapshot is not refreshed. For this reason, on iOS 13 and iOS 14, we need to manually check which objects have been updated and manually refresh the corresponding items in the snapshot. Now, it seems that on iOS 15 this is no more needed. The new snapshot I receive in the NSFetchedResultsController didChangeContentWith delegate method also contain refreshed items. So, in order to apply the new snapshot I only need to call a single line of code: func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) { guard let diffableDataSource = diffableDataSource else {return} diffableDataSource.apply(snapshot as NSDiffableDataSourceSnapshot<Section, NSManagedObjectID>, animatingDifferences: true) } That's great, but I'm not sure if that's a feature we can count on from iOS 15 onwards. Is this new behaviour documented somewhere? Thank you

Hi, It seems that when using the inset grouped style in a UITableView, the cells are not aligned with the navigation bar large title. However, I've noticed that all Apple apps that seem to use this style (Settings, Notes) don't have this issue and the cells are perfectly aligned with the title. In the below example you can see that the cells of an inset grouped table are not aligned with the title (extra space between the red line and the cells) but the one's of the Apple apps are perfectly aligned. Do you know if there is a way to change the left and right cells margins of an inset grouped table in order to align them with the large title? Thank you

Hi, This is how I'm currently configuring an UICollectionView sidebar cell. let rowRegistration = UICollectionView.CellRegistration<UICollectionViewListCell, SidebarItem> { (cell, indexPath, item) in var contentConfiguration = UIListContentConfiguration.sidebarSubtitleCell() contentConfiguration.text = item.title contentConfiguration.secondaryText = item.subtitle contentConfiguration.image = item.image cell.contentConfiguration = contentConfiguration } In order to specify the selection background color of the cell I'm setting the backgroundConfiguration property. This work as expected: let rowRegistration = UICollectionView.CellRegistration<UICollectionViewListCell, SidebarItem> { (cell, indexPath, item) in var contentConfiguration = UIListContentConfiguration.sidebarSubtitleCell() contentConfiguration.text = item.title contentConfiguration.secondaryText = item.subtitle contentConfiguration.image = item.image cell.contentConfiguration = contentConfiguration var backgroundConfiguration = UIBackgroundConfiguration.listSidebarCell() backgroundConfiguration.backgroundColorTransformer = UIConfigurationColorTransformer { [weak cell] (color) in if let state = cell?.configurationState { if state.isSelected || state.isHighlighted { return UIColor(named: "Primary")! } } return .clear } cell.backgroundConfiguration = backgroundConfiguration } Now I also need to change the text color based on the cell selection. When the cell is selected the text should be white. I tried to set the colorTransformer of textProperties of contentConfiguration like so: contentConfiguration.textProperties.colorTransformer = UIConfigurationColorTransformer { [weak cell] (color) in if let state = cell?.configurationState { if state.isSelected || state.isHighlighted { return .white } } return .black } Unfortunately the text color does not change after the cell has been selected. What am I doing wrong? Can anyone help me? Thank you

Hi, I'm currently let the user pick a photo using PHPickerViewController. The advantage of PHPickerViewController is that the user is not requested to grant photo access (no permission alerts). After the user picked the photo I need to take note of the local identifier and the cloud identifier (PHCloudIdentifier). For the local identifier no problem, I just use the assetIdentifier from the PHPickerResult. For obtaining the cloud identifier (PHCloudIdentifier, on iOS 15 only) I need to use the cloudIdentifierMappings method of PHPhotoLibrary. The problem of that method is that is causing the photo library access permission alerts to display. Someone know if there is another way to get the cloud identifier from a local identifier without having to prompt the user photo library access? Thank you

Hi, I need to understand inside an override of UIBarButtonItem what is the systemItem of the button (done, add, trash, search, ...). Unfortunately at the moment the only method I found is to inspect the content of self.description (see below), but this solution, as well as being ugly, is very fragile because we can't be sure that the description will be the same also on future version of iOS / Swift. Someone know a better way to check for systemItem inside an UIBarButtonItem override class? Thank you class BarButtonItem: UIBarButtonItem {     override func awakeFromNib() {         super.awakeFromNib()         print(self.description)     } } <MyApp.BarButtonItem: 0x7fadbcacbea0> systemItem=Trash

Hi, If I generate an image from a symbol the resulting image is surrounded by some margins. For example this code: let image = UIImage(systemName: "suit.heart") will generate this image: As you can see there are some margins around the content. There is a way to build an image cropped to the actual content, like showed in the below example? Thank you

I need to set the value of a variable according to a preprocessor rule, like in the example below. var doSomething = false #if targetEnvironment(macCatalyst) doSomething = true #endif if doSomething { print("Execute!") } If I build the code for an iOS simulator, Xcode will generate a "Will never be executed" alert at the print("Execute!") line. This make sense because preprocessor rules are evaluated before compilation and therefore the code above, when the target is an iOS simulator, corresponds to: var doSomething = false if doSomething { print("Execute!") } I just want to know if there is any advices for handling cases like that. Ideally, I would like to avoid using the preprocessor condition for every statement, like so: #if targetEnvironment(macCatalyst) print("Execute!") #endif but rely on a variable like the original example. I would also prefer to avoid completely disabling in Xcode the display of "Will never be executed" warnings for all source codes. Is there a way to set the "doSomething" variable so that Xcode doesn't display the warning in a case like that? Thank you

Hi, I'm starting using StoreKit 2 and I have some questions regarding transactions. To check which non-consumable in-app purchases the user has purchased, immediately after starting the app I look at Transaction.currentEntitlements. That's working fine, but I have some questions about it. Question 1: What happens if the user is not connected to the internet? Will Transaction.currentEntitlements still return data? Question 2: What happens if the user sign out from the AppStore? Will Transaction.currentEntitlements be empty? Question 3: What happens if the user sign in AppStore with different credentials? Transaction.currentEntitlements will return the transaction of the new AppStore user? Thank you

Hi, I'm looking for a way to get the list of pending purchases, i.e. the purchases made when the "Ask to buy" feature is enabled and which have yet to be approved. I need this in order to update the UI of my store and disable the possibility to buy products when they are pending for approval. I tried to look into Transaction.all but pending transactions seems to be missing. How can we get the list of pending purchases? Thank you