We are seeing crashes only on iOS 14 (and its sub-releases) that we are unable to reproduce locally with the following stack trace: Fatal Exception: NSGenericException UIPopoverPresentationController (<UIPopoverPresentationController: 0x112513b50>) should have a non-nil sourceView or barButtonItem set before the presentation occurs. Last Exception Backtrace: 0 CoreFoundation 0x1a36eb9d8 __exceptionPreprocess + 216 (NSException.m:199) 1 libobjc.A.dylib 0x1b7a6eb54 objc_exception_throw + 56 (objc-exception.mm:565) 2 UIKitCore 0x1a577eba4 -[UIPopoverPresentationController presentationTransitionWillBegin] + 3908 (UIPopoverPresentationController.m:1326) 3 UIKitCore 0x1a578a1fc __80-[UIPresentationController _initViewHierarchyForPresentationSuperview:inWindow:]_block_invoke + 2392 (UIPresentationController.m:1574) 4 UIKitCore 0x1a5787cd8 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke.466 + 532 (UIPresentationController.m:1079) 5 UIKitCore 0x1a63fff08 -[_UIAfterCACommitBlock run] + 64 (_UIAfterCACommitQueue.m:122) 6 UIKitCore 0x1a5f65984 _runAfterCACommitDeferredBlocks + 296 (UIApplication.m:2920) 7 UIKitCore 0x1a5f54eb4 _cleanUpAfterCAFlushAndRunDeferredBlocks + 200 (UIApplication.m:2898) 8 UIKitCore 0x1a5f86484 _afterCACommitHandler + 76 (UIApplication.m:2954) 9 CoreFoundation 0x1a366a87c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32 (CFRunLoop.c:1799) 10 CoreFoundation 0x1a3664f50 __CFRunLoopDoObservers + 604 (CFRunLoop.c:1912) 11 CoreFoundation 0x1a3665498 __CFRunLoopRun + 960 (CFRunLoop.c:2953) 12 CoreFoundation 0x1a3664ba0 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242) 13 GraphicsServices 0x1ba3ca598 GSEventRunModal + 160 (GSEvent.c:2259) 14 UIKitCore 0x1a5f562f4 -[UIApplication _run] + 1052 (UIApplication.m:3253) 15 UIKitCore 0x1a5f5b874 UIApplicationMain + 164 (UIApplication.m:4707) 16 libswiftUIKit.dylib 0x1b6de2b54 UIApplicationMain(_:_:_:_:) + 100 (UIKit.swift:528) 17 IXLMath 0x1049da44c main + 58444 (<compiler-generated>:0) 18 libdyld.dylib 0x1a3343568 start + 4 We only set modalPresentationStyle = .popover with this method in our UIViewController extension   @discardableResult  func setUpPopoverPresentation(sourceView: UIView, sourceRect: CGRect)  -> UIPopoverPresentationController {   modalPresentationStyle = .popover   popoverPresentationController!.sourceView = sourceView   popoverPresentationController!.sourceRect = sourceRect   return popoverPresentationController!  } We sometimes pass a force unwrapped optional, e.g., @IBOutlet weak var borderLabel: UILabel!, as sourceView, but we don't expect this value to be nil and believe we would see other issues if it were nil. Are there any requirements for the sourceView or sourceRect we use for the popoverPresentationController besides being non-nil? Can sourceView be a force unwrapped optional as long as it is not nil? Can sourceRect have a 0 height and 0 width? Is there potentially an iOS 14 bug related to this? Could bad memory be manifesting itself with this exception? Does anyone have other ideas about the cause of this issue or suggestions for fixing it? We have already looked at Apple documentation for UIPopoverPresentationController and popoverPresentationController and have not been able to find answers. Thank you!

Could someone provide some insights about the performance hits for adding associated domains? What guidelines should we use to make the most out of associated domains and minimize performance impact? Are there specific tips in terms of domains for different locales or using wildcards in the domain? Is there a point where there are too many associated domains in the entitlements file? Will marking an associated domain as developer mode improve performance for prod apps, as production apps won’t need to request the asa files from those domains? Thanks!

We have a learning website for children. We have had multiple customer reports of some of our pages, e.g., https://www.ixl.com/math/grade-3/find-equivalent-fractions-using-area-models-two-models and https://www.ixl.com/standards/minnesota/ela/grade-3, being blocked with "Limit Adult Websites" turned on in the Screen Time settings. What causes websites to be blocked with "Limit Adult Websites" turned on? How can we prevent our children friendly pages from being blocked with this setting? Is there anything Apple can do to address this? Thank you!