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self.tableView = [[UITableView alloc] initWithFrame:self.view.frame]; - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section { UILabel *label = [[UILabel alloc] init];     label.text = @"test";     return label; } - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {     return 0.01; } it works perfect on iOS14. but on iOS15 XCode13 beta. it doesn't work anymore. have a default header which height is 22 here

The following code fails since iOS14.x Is this a bug? No depreciation statements found in the SDK. Is there a workaround? import UIKit class ViewController: UIViewController { private lazy var barButtonItem: UIBarButtonItem = { UIBarButtonItem(image: .add, style: .plain, target: self, action: #selector(doSomething)) }() override var navigationItem: UINavigationItem { let item = super.navigationItem item.rightBarButtonItem = barButtonItem // <- Thread 1: EXC_BAD_ACCESS (code=2, address=...) item.title = "TestCase" return item } override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. } @objc private func doSomething() { print(">>doSomething") } } We are running a complex software since iOS4 and cannot simply migrate to SwiftUI. https://stackoverflow.com/questions/64270033/override-var-navigationitem-uinavigationitem-fail-in-ios-14

Hi In this snippet, I've already added a button, the onDisplay action simply adds another UIButton with an addAction event to the view controller @IBAction func onDisplay(_ sender: UIButton) { let semaphore = DispatchSemaphore(value: 1)     var didComplete = false     addButton("hello world") { result in         print("result: \(result)")         didComplete = result         semaphore.signal()     }     if semaphore.wait(timeout: .now() + 5) == .timedOut {         print("timeout: \(didComplete)")     }     print("didComplete: \(didComplete)") } func addButton(_ message: String, completion: @escaping (Bool) -> Void) {     let button = UIButton(type: .system)     button.frame = CGRect(x: 100, y: 100, width: 100, height: 40)     button.backgroundColor = .systemBlue     button.setTitle(message, for: .normal)     button.titleLabel?.tintColor = .white     button.addAction(UIAction(handler: { action  in             completion(true)     }), for: .touchUpInside)     view.addSubview(button) } What I'm expecting to happen, is the new "hello world" button get created (which it does). If the user does nothing for 5 seconds (semaphore timeout), then print timeout: false. If the user tapped the button, this would print result: true in the completion closure. But what happens when I don't touch the button is didComplete: false prints out (the last line) and the semaphore.wait never gets invoked. How do I make the semaphore execute it's wait operation? Been struggling with this for days 😞

Hi, One of our users is having an issue with our iOS App hanging consistently. The trace produced is not always the same but some parts are consistent between hangs. We have not been able to reproduce on our end. One sample stack trace from user is: CrashReporter Key: bf76ea06932831ef2338cbe2b08c552b6140ef83 Hardware Model: iPhone12,3 Version: 100.0.0 Role: Foreground OS Version: iOS 14.6 App Hang: The app was terminated while unresponsive 0 libsystem_kernel.dylib ___psynch_cvwait 1 libsystem_pthread.dylib __pthread_cond_wait 2 Metal -[_MTLCommandBuffer waitUntilCompleted] 3 CoreImage CI::MetalContext::readback_bitmap(CI::Bitmap*, CI::swizzle_info) 4 CoreImage ____ZN2CI16image_get_bitmapEPNS_7ContextEPNS_5ImageE6CGRectP12CGColorSpacePNS_6BitmapEPKNS_17RenderDestinationE_block_invoke 5 CoreImage CI::recursive_tile(CI::RenderTask*, CI::Context*, CI::RenderDestination const*, char const*, CI::Node*, CGRect const&, CI::PixelFormat, CI::swizzle_info const&, CI::TileTask* ( block_pointer)(CI::ProgramNode*, CGRect)) 6 CoreImage CI::tile_node_graph(CI::Context*, CI::RenderDestination const*, char const*, CI::Node*, CGRect const&, CI::PixelFormat, CI::swizzle_info const&, CI::TileTask* ( block_pointer)(CI::ProgramNode*, CGRect)) 7 CoreImage CI::image_get_bitmap(CI::Context*, CI::Image*, CGRect, CGColorSpace*, CI::Bitmap*, CI::RenderDestination const*) 8 CoreImage -[CIContext render:toBitmap:rowBytes:bounds:format:colorSpace:] 9 CoreUI -[CUIShapeEffectStack _newFlattenedImageFromShapeCGImage:withScale:ciContext:blendOverImage:] 10 CoreUI -[CUICatalog imageByStylingImage:stylePresetName:styleConfiguration:foregroundColor:scale:] 11 UIKitCore -[UIImage _imageWithStylePresets:tintColor:traitCollection:] 12 UIKitCore -[UIImageView _renditionForSource:size:withCGImageProvider:lazy:] 13 UIKitCore -[_UIImageContentContextualEffect _renditionWithCGImageProvider:size:lazy:] 14 UIKitCore -[_UIImageContent renditionWithSize:scale:applyingEffect:] 15 UIKitCore -[_UIImageContent renditionApplyingEffect:] 16 UIKitCore -[_UIImageCGImageContent renditionApplyingEffect:] 17 UIKitCore -[_UIImageContentLayout _materializeContentsIfNeeded] 18 UIKitCore -[_UIImageContentLayout contentsMultiplyColor] 19 UIKitCore -[UIImageView _updateContentsMultiplyColorAndSwizzleFromLayout:] 20 UIKitCore -[UIImageView _setImageViewContents:] 21 UIKitCore -[UIImageView _updateState] 22 UIKitCore +[UIView(Animation) performWithoutAnimation:] 23 UIKitCore -[UIImageView _updateImageViewForOldImage:newImage:] 24 UIKitCore -[UIImageView setImage:] 25 UIKitCore -[UIButton _updateImageView] 26 UIKitCore -[UIButton layoutSubviews] 27 UIKitCore -[UIView(CALayerDelegate) layoutSublayersOfLayer:] 28 QuartzCore -[CALayer layoutSublayers] 29 QuartzCore CA::Layer::layout_if_needed(CA::Transaction*) 30 QuartzCore CA::Layer::layout_and_display_if_needed(CA::Transaction*) 31 QuartzCore CA::Context::commit_transaction(CA::Transaction*, double, double*) 32 QuartzCore CA::Transaction::commit() 33 QuartzCore CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) 34 CoreFoundation ___CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ 35 CoreFoundation ___CFRunLoopDoObservers 36 CoreFoundation ___CFRunLoopRun 37 CoreFoundation _CFRunLoopRunSpecific 38 GraphicsServices _GSEventRunModal 39 UIKitCore -[UIApplication _run] 40 UIKitCore _UIApplicationMain 42 libdyld.dylib _start What could be causing the above? Thanks in advance for your help.

I have iPhone 11 Pro running iOS 14 beta 2. In one of my projects (and only that project perhaps), the view controller doesn't autorotate when connected to XCode (11 or 12) debugger. When not connected to debugger, there is no issue in autorotation. This happens for only one particular project and it's not clear what could be blocking autorotation. None of the autorotation methods are called. I wonder what could be blocking autorotation. And if I connect any iOS 13 device, autorotation works with the debugger. Is this a known issue with iOS 14/XCode?

Hi! I'm developing a new iOS app that will store user-created items. These particular items will be divided into categories, which I want to be able to assign an emoji. Just like Reminders app does for lists. In Reminders instead of choosing the icon, the user can tap on the emoji symbol and the special keyboard type will be presented. This keyboard forces the user to use emoji only and doesn't allow switching to some other languages. I wonder if it's possible for ordinary mortals? My app would benefit from using emojis this way, just like icons, then including some icons pack for users to choose from instead.

Hi, I am trying to integrate new DatePicker available with iOS 14 in my app and I am facing an issue with its animation while closing it. Steps to reproduce: Tap on DatePicker to Select time Tap on Time textfield Use keypad to change the time Tap outside to close the picker Issue: Picker moves down slightly after closing and then jumps up to its original position

I've created what seems to be the simplest possible programmatically-created iOS UI - just a view with a single UITextField placed in it. However, when I try to type in the text field, nothing happens - what am I missing in order to make this UI functional? My application consists of only an AppDelegate and a ViewController. My main function calls into UIApplicationMain using my AppDelegate, and I have only overridden two functions: AppDelegate's didFinishLaunchingWithOptions, and ViewController's viewDidLoad function. My AppDelegate just creates a single window, sets the root view controller, and makes it the key window: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; self.window.rootViewController = [[ViewController alloc] init]; [self.window makeKeyAndVisible]; return YES; } And my ViewController just creates a text field and adds it to the view: - (void)viewDidLoad { [super viewDidLoad]; // Creates a text field somewhere near-ish to the center of the screen UITextField* text = [[UITextField alloc] initWithFrame:CGRectMake(50, 100, 200, 50)]; text.borderStyle = UITextBorderStyleRoundedRect; text.returnKeyType = UIReturnKeyDone; // Set the view background as white just to make sure we're in the right place... self.view.backgroundColour = [UIColor whiteColor]; [self.view.addSubview:text]; } Some things which I have tried without any effect: Overriding loadView from ViewController as well as viewDidLoad and creating the view manually in that function Bringing the text field to the front with [self.view bringSubviewToFront:text] Setting all the enabled properties I can find - [text setUserInteractionEnabled true], [self.view setUserInteractionEnabled true], text.enabled = true Also possibly related - if I force the keyboard to become active with [text becomeFirstResponder]; immediately after adding the text field, the keyboard does show up, but no keypresses have any effect and an assert shows up in the debugger log when typing: [Assert] View <(null):0x0> does not conform to UITextInput protocol. If default text is set in the text field, I'm able to tap it to bring up the keyboard, but again run into this assert and an inactive keyboard. What am I missing in my attempt to create a simple text field programmatically in an iOS app? And, for bonus points, is there any good way to debug the assertion that fires?

Hello everyone, I'm trying to integrate a SwiftUI TextField component into a UIViewController. But any kind of tutorial I've seen, have this implementation: let childView = UIHostingController(rootView: SwiftUIView()) addChild(childView) childView.view.frame = frame view.addSubview(childView.view) childView.didMove(toParent: self) But, when I do this, my Navigation Bar disappear. But when I remove the "addChild" peace of code, everything works well. Is this a wrong thing to do? Can I remove this part of code?

I have a UIViewController that presents a UIDocumentPicker to pick PDF files, and contains a UICollectionView that displays them (each cell contains a PDFView to do so). Here is the code: import MobileCoreServices; import PDFKit; import UIKit class ViewController: UIViewController { var urls: [URL] = [] @IBOutlet weak var collectionView: UICollectionView! @IBAction func pickFile() { DispatchQueue.main.async { let documentPicker = UIDocumentPickerViewController(documentTypes: [kUTTypePDF as String], in: .import) documentPicker.delegate = self documentPicker.modalPresentationStyle = .formSheet self.present(documentPicker, animated: true, completion: nil) } } override func viewDidLoad() { collectionView.register(UINib(nibName: PDFCollectionViewCell.identifier, bundle: .main), forCellWithReuseIdentifier: PDFCollectionViewCell.identifier) } init() { super.init(nibName: "ViewController", bundle: .main) } required init?(coder: NSCoder) { fatalError() } } extension ViewController: UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout { func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: PDFCollectionViewCell.identifier, for: indexPath) as! PDFCollectionViewCell cell.pdfView.document = PDFDocument(url: urls[indexPath.row]) return cell } func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return urls.count } func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { CGSize(width: 150, height: 150) } } extension ViewController: UIDocumentPickerDelegate { // MARK: PDF Picker Delegate func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) { controller.dismiss(animated: true, completion: nil) } func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) { controller.dismiss(animated: true, completion: { DispatchQueue.main.async { self.urls.append(contentsOf: urls) self.collectionView.reloadData() } }) } } class PDFCollectionViewCell: UICollectionViewCell { static let identifier = "PDFCollectionViewCell" @IBOutlet weak var pdfView: PDFView! { didSet { setPdfViewUI() } } func setPdfViewUI() { pdfView.displayMode = .singlePage pdfView.autoScales = true pdfView.displayDirection = .vertical pdfView.isUserInteractionEnabled = false } } Now, for some reason, the collectionView.reloadData() actually only works one time in two. It works the first time, then the second time nothing happens, then the third time the collection view is updated again with the three expected elements... I realized that even if I'm calling reloadData(), the dataSource and delegate methods (numberOfItems/cellForItem) are not getting called when this happens. Any idea of what is happening? Am I doing something wrong? Thank you for your help!

I don't understand the changes made to the tab bar in iOS 15. In my app, I have a collection view that goes all the way down to the bottom of the screen. When the tab bar appears, it covers some of that collection view, which is fine. However, in iOS15, the tab bar has no background (and no blur effect), thus making the tab bar item text hard to see over the collection view. In interface builder, I tried turning on the "Scroll Edge" option. This gives a translucent background to the tab bar similar to what I had in iOS 14. Unfortunately, the menu tab bar item text size is affected by this option. For some reason, it doesn't use the font size I set, but something smaller. Why is this happening? How do I get it to use the correct font size? P.S. I'm only using text for the tab bar items. There are no images.