Several questions here: override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) - UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "dataCell", for: indexPath) as! GalleryImageCell let asset = images[indexPath.row] let ImageManager = PHImageManager.default() if cell.tag != 0 { ImageManager.cancelImageRequest(PHImageRequestID(cell.tag)) } cell.tag = Int(ImageManager.requestImage(for: asset, targetSize: CGSize(width: 120, height: 120), contentMode: .aspectFill, options: nil, resultHandler: { (result, _) in cell.galleryImage?.image = result })) return cell } line 6, are you sure the tag is 0 ? should add a print to check: if cell.tag != 0 { ImageManager.cancelImageRequest(PHImageRequestID(cell.tag)) print("Exists, tag is", cell.tag) } result is optional. Did you try to unwrap result cell.tag = Int(ImageManager.requestImage(for: asset, targetSize: CGSize(width: 120, height: 120), contentMode: .aspectFill, options: nil, resultHandler: { (result, _) in cell.galleryImage?.image = result ?? UIImage() })) Are you sure to get an image ? To check, try to copy the image in a single UIImageView, to check you get some image. Note: var names should start with lowercase: imageManager vs ImageManager

Not sure to understand exactly what you want. Is there a method that gets called when the "clear" button from notification center is used? I want on that call to reset badge number to 0. Which badge is it ? When you clear, it is automatically reset to zero. Is it a badge in your app ? May have a look here for possible solution: https://stackoverflow.com/questions/48191694/how-to-detect-clear-notifications

Have you a mean to extract a simplified project without the library ? Another idea (low probability): does it happen wherever you tap on screen, or only on certain parts ? check all the parameters of the tabBar (in IB). May be some size is too large and cover other parts of the screen ? did you debug the view hierarchy when running in simulator ?

There are no tapGestureRecognizers anywhere in my code except for that found in a well-known third party library that does not have any known bugs relating to this issue. How can you be so sure ? If you want to force the selected tab, look here https://stackoverflow.com/questions/25325923/programmatically-switching-between-tabs-within-swift and here https://stackoverflow.com/questions/52178000/tapping-on-a-tabbar-item-should-always-open-the-first-view-controller for some hints.

Please show more code, the full class. How did you define AppDelegate class ? Should be like this, with all the AppDelegate func, such as didFinishLaunchingWithOptions : @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) - Bool {         // Override point for customization after application launch.         return true     } I tested, I get non nil delegate.

It seems problem has already been reported several times: https://developer.apple.com/forums/thread/667921 https://developer.apple.com/forums/thread/652852 For others, it worked in iOS13 and no more on 14 ß https://developer.apple.com/forums/thread/650741 Could you test on an iOS 13 device ? If it works, I fear you'll have to avoid iOS13 simulator for this app…

In the Project targets, you need to : go to Signing and Capabilities Tap on "+ Capability" Double click on the item in the list that appears

I found a trick, but not very satisfying. I opened the project in Xcode 10. I got some warning on signing certificate that I ignored There, in Capabilities, I could switch off Background modes Reopened in Xcode 12, the entry was cleared. I filed a bug report : FB9044716

Yes. It was really well hidden !

You have to set title explicitly: Swift           button.setTitle("Some title", for: .normal) objC: use (void)setTitle:(NSString *)title forState:(UIControlState)state; should be like [button setTitle:@"Some Title" forState:UIControlEventAllEvents];

App crashes at start under iOS 13.x what x ? Does it work in 13.5 ? Does it crash below 13.4 ?

Don't animate present. Replace self?.present(vc, animated: true) with self?.present(vc, animated: false) Also check you call super where needed, as you did in viewDidLoad.

I would really contact React native support. That may be a VPN issue, only them can investigate.

The problem is that you can test only once a day, that makes debugging harder. Very quick reading so far. Have you checked, each day, the values of let sunriseGoldenHourStart = sunlight.calculate(.dawn, twilight: .custom(-4)) let sunsetGoldenHourStart = sunlight.calculate(.dusk, twilight: .custom(6)) Why repeats true, do you really want it to be repeated once user has read ? In anywise, I would try not to repeats false Take care also, if formattedSunsetGoldenHourStart.minute is less than 30, you'll have an error.

Why do you reload once selected. That removes the selection, hence may cause a problem. In addition, you add target in didSelectRowAt. That should be done instead in cellForRow at