Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread. I have been experiencing frequent crashes on iOS 17 and above recently, and I'm having trouble pinpointing the source of the crashes. The crash logs provide no information about the specific location of the crashes. Is there any workaround or solution to identify and resolve this issue? Please find attached the crash logs below

Having an issue with crashes on iOS 16 and iOS 17 devices. App works and will appear to operate normally. However after a while the app will crash with a EXC_BREAKPOINT on libobjc.A.dylib object_getClass. The root cause seems to be something related to UIViews/Core Animation, I think. However the root crash trigger seems to be a half a dozen different triggers from the UI on main thread. It also only triggers on release builds, or the dev builds take a lot longer to trigger to the point it's very difficult to reproduce. Here are some examples of the crashes occurring. Crashed: com.apple.main-thread 0 libobjc.A.dylib 0xe838 object_getClass + 48 1 Foundation 0x1c854 _NSKeyValueObservationInfoGetObservances + 264 2 Foundation 0x1bd1c NSKeyValueWillChangeWithPerThreadPendingNotifications + 232 3 QuartzCore 0x59408 CAAnimation_setter(CAAnimation*, unsigned int, _CAValueType, void const*) + 128 4 QuartzCore 0x749b4 -[CAAnimation setBeginTime:] + 52 5 QuartzCore 0x728b4 CA::Layer::commit_animations(CA::Transaction*, double (*)(CA::Layer*, double, void*), void (*)(CA::Layer*, CA::Render::Animation*, void*), void (*)(CA::Layer*, __CFString const*, void*), CA::Render::TimingList* (*)(CA::Layer*, void*), void*) + 740 6 QuartzCore 0x2aeac invocation function for block in CA::Context::commit_transaction(CA::Transaction*, double, double*) + 148 7 QuartzCore 0x2adb4 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 368 8 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 9 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 10 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 11 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 12 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 13 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 14 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 15 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 16 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 17 QuartzCore 0x2ad40 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 18 QuartzCore 0x6f548 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 11192 19 QuartzCore 0x65e3c CA::Transaction::commit() + 648 20 UIKitCore 0x924cc _afterCACommitHandler + 84 21 CoreFoundation 0x3583c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36 22 CoreFoundation 0x34244 __CFRunLoopDoObservers + 548 23 CoreFoundation 0x33960 __CFRunLoopRun + 1028 24 CoreFoundation 0x33478 CFRunLoopRunSpecific + 608 25 GraphicsServices 0x34f8 GSEventRunModal + 164 26 UIKitCore 0x22c62c -[UIApplication _run] + 888 27 UIKitCore 0x22bc68 UIApplicationMain + 340 0 libobjc.A.dylib 0x5d94 object_getClass + 48 1 Foundation 0xadb8 _NSKeyValueObservationInfoGetObservances + 248 2 Foundation 0x3f670 NSKeyValueWillChangeWithPerThreadPendingNotifications + 232 3 QuartzCore 0xbb18 CAAnimation_setter(CAAnimation*, unsigned int, _CAValueType, void const*) + 128 4 QuartzCore 0xcc14 -[CAPropertyAnimation setKeyPath:] + 52 5 QuartzCore 0xcbc0 +[CAPropertyAnimation animationWithKeyPath:] + 36 6 UIKitCore 0xc89fb0 -[UIMorphingLabel animateGlyph:toScale:delay:] + 308 7 UIKitCore 0xc8a1fc -[UIMorphingLabel animateShowGlyph:alpha:alphaDuration:delay:] + 196 8 UIKitCore 0xc8b3f0 -[UIMorphingLabel animateSubstitutionAlignmentHunkAtIndex:] + 1068 9 UIKitCore 0x42cd84 -[UIMorphingLabel animateGlyphs] + 276 10 UIKitCore 0xa374 -[UIMorphingLabel layoutSubviews] + 368 11 UIKitCore 0x4420 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1992 12 QuartzCore 0x9f30 CA::Layer::layout_if_needed(CA::Transaction*) + 500 13 QuartzCore 0x1d4ac CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 148 14 QuartzCore 0x2e8d8 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 444 15 QuartzCore 0x5de80 CA::Transaction::commit() + 648 16 QuartzCore 0x47df0 CA::Transaction::flush_as_runloop_observer(bool) + 88 17 CoreFoundation 0x90234 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36 18 CoreFoundation 0x1a410 __CFRunLoopDoObservers + 532 19 CoreFoundation 0x7a19c __CFRunLoopRun + 1028 20 CoreFoundation 0x7f3ec CFRunLoopRunSpecific + 612 21 GraphicsServices 0x135c GSEventRunModal + 164 22 UIKitCore 0x39cf58 -[UIApplication _run] + 888 23 UIKitCore 0x39cbbc UIApplicationMain + 340 I'm at a loss, I'm clearly doing something wrong in the UIView/Core Animation side of things. Would be very grateful for anyone who can point me in the right direction.

Hello everyone, I'm working on a macOS application and encountering an issue related to multi-screen setups. My application includes an animation in the menu bar, and it works perfectly on the primary screen. However, I want this animation to stop or not appear when the app is being used on a secondary monitor(non-focused monitor). (for cpu related problem, when it's 3 monitor -> x3 cpu with x3 animation objects) I've tried a few approaches to detect when the application is being used on a secondary screen and then stop the animation, but so far, I haven't had any success. The main challenge seems to be accurately determining the screen where the app is actively being used and controlling the animation accordingly. Has anyone faced a similar issue or have suggestions on how to effectively stop or prevent the menu bar animation from running on a secondary screen? Any guidance or insights would be greatly appreciated. Thank you in advance for your help!

I have a navigation controller with two VCs. One VC is pushed onto the NavController, the other is presented on top of the NavController. The presented VC has a relatively complex animation involving a CAEmitter -> Animate birth rate down -> Fade out -> Remove. The pushed VC has an 'inputAccessoryView' and can become first responder. The expected behavior is open presented VC -> Emitter Emits pretty pictures -> emitter stops gracefully. The animation works perfectly. UNLESS I open pushed VC -> Leave -> go to presented VC. In this case when I open the presented VC the emitter emits pretty pictures -> they never stop. (Please do not ask me how long it took to figure this much out 🤬😔) The animation code in question is: let animation = CAKeyframeAnimation(keyPath: #keyPath(CAEmitterLayer.birthRate)) animation.duration = 1 animation.timingFunction = CAMediaTimingFunction(name: .easeIn) animation.values = [1, 0 , 0] animation.keyTimes = [0, 0.5, 1] animation.fillMode = .forwards animation.isRemovedOnCompletion = false emitter.beginTime = CACurrentMediaTime() let now = Date() CATransaction.begin() CATransaction.setCompletionBlock { [weak self] in print("fade beginning -- delta: \(Date().timeIntervalSince(now))") let transition = CATransition() transition.delegate = self transition.type = .fade transition.duration = 1 transition.timingFunction = CAMediaTimingFunction(name: .easeOut) transition.setValue(emitter, forKey: kKey) transition.isRemovedOnCompletion = false emitter.add(transition, forKey: nil) emitter.opacity = 0 } emitter.add(animation, forKey: nil) CATransaction.commit() The delegate method is: extension PresentedVC: CAAnimationDelegate { func animationDidStop(_ anim: CAAnimation, finished flag: Bool) { if let emitter = anim.value(forKey: kKey) as? CALayer { emitter.removeAllAnimations() emitter.removeFromSuperlayer() } else { } } } Here is the pushed VC: class PushedVC: UIViewController { override var canBecomeFirstResponder: Bool { return true } override var canResignFirstResponder: Bool { return true } override var inputAccessoryView: UIView? { return UIView() } } So to reiterate - If I push pushedVC onto the navController, pop it, present PresentedVC the emitters emit, but then the call to emitter.add(animation, forKey: nil) is essentially ignored. The emitter just keeps emitting. Here are some sample happy print statements from the completion block: fade beginning -- delta: 1.016232967376709 fade beginning -- delta: 1.0033869743347168 fade beginning -- delta: 1.0054619312286377 fade beginning -- delta: 1.0080779790878296 fade beginning -- delta: 1.0088880062103271 fade beginning -- delta: 0.9923020601272583 fade beginning -- delta: 0.99943196773529 Here are my findings: The issue presents only when the pushed VC has an inputAccessoryView AND canBecomeFirstResponder is true It does not matter if the inputAccessoryView is UIKit or custom, has size, is visible, or anything. When I dismiss PresentedVC the animation is completed and the print statements show. Here are some unhappy print examples: fade beginning -- delta: 5.003802061080933 fade beginning -- delta: 5.219511032104492 fade beginning -- delta: 5.73025906085968 fade beginning -- delta: 4.330522060394287 fade beginning -- delta: 4.786169052124023 CATransaction.flush() does not fix anything Removing the entire CATransaction block and just calling emitter.add(animation, forKey: nil) similarly does nothing - the birth rate decrease animation does not happen I am having trouble creating a simple demo project where the issue is reproducible (it is 100% reproducible in my code, the entirety of which I'm not going to link here) so I think getting a "solution" is unrealistic. What I would love is if anyone had any suggestions on where else to look? Any ways to debug CAAnimation? I think if I can solve the last bullet - emitter.add(animation, forKey: nil) called w/o a CATransaction - I can break this whole thing. Why would a CAAnimation added directly to the layer which is visible and doing stuff refuse to run?

To reproduce this bug: Set the .large navigation title in a View (which is in a NavigationView) Add the .searchable modifier And add the .refreshable modifier over a scroll view for example Drag the pull to refresh Actual result: The navigation bar is blinking and jumping to the top without smooth animation Expected result: Navigation bar behaves expectedly as usual I noticed if we use the .inline navigation title style or remove the .searchable modifier it work correctly

Hi. Can anyone who's into cosmology give hints as to how I might depict and animate dark matter for the VisionPro?

In the iOS app I'm developing, I've noticed that since upgrading to iOS 17 (Xcode 15.1), crashes of this type occur frequently. The crashes are random and can't be reliably reproduced. Below is a typical crash report: CrashReporter Key: fd24cf14a51d73ebfc1852cccb1b8d50822b247c Hardware Model: iPhone11,2 Process: MyApp [89057] Path: /private/var/containers/Bundle/Application/06B982E0-B818-48A9-B2D1-F28999EC3BC0/MyApp.app/MyApp Identifier: com.company.MyApp Version: 2.0.0 (72) Code Type: ARM-64 (Native) Role: Foreground Parent Process: launchd [1] Coalition: com.company.MyApp [4659] Date/Time: 2024-03-24 14:50:46.3982 +0800 Launch Time: 2024-03-24 14:38:38.1438 +0800 OS Version: iPhone OS 17.3.1 (21D61) Release Type: User Baseband Version: 6.00.00 Report Version: 104 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000001, 0x000000018c44e838 Termination Reason: SIGNAL 5 Trace/BPT trap: 5 Terminating Process: exc handler [89057] Triggered by Thread: 0 Kernel Triage: VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libobjc.A.dylib 0x18c44e838 object_getClass + 48 1 Foundation 0x1930807b4 _NSKeyValueObservationInfoGetObservances + 264 2 Foundation 0x19307fc7c NSKeyValueWillChangeWithPerThreadPendingNotifications + 232 3 QuartzCore 0x19572f14c CAAnimation_setter(CAAnimation*, unsigned int, _CAValueType, void const*) + 128 4 QuartzCore 0x19574a6b4 -[CAAnimation setBeginTime:] + 52 5 QuartzCore 0x1957485b4 CA::Layer::commit_animations(CA::Transaction*, double (*)(CA::Layer*, double, void*), void (*)(CA::Layer*, CA::Render::Animation*, void*), void (*)(CA::Layer*, __CFString const*, void*), CA::Render::TimingList* (*)(CA::Layer*, void*), void*) + 740 6 QuartzCore 0x195700bf0 invocation function for block in CA::Context::commit_transaction(CA::Transaction*, double, double*) + 148 7 QuartzCore 0x195700af8 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 368 8-14QuartzCore 0x195700a84 CA::Layer::commit_if_needed(CA::Transaction*, void (CA::Layer*, unsigned int, unsigned int) block_pointer) + 252 15 QuartzCore 0x195745248 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 11192 16 QuartzCore 0x19573bb80 CA::Transaction::commit() + 648 17 QuartzCore 0x19573b828 CA::Transaction::flush_as_runloop_observer(bool) + 88 18 CoreFoundation 0x1940ff7bc __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36 19 CoreFoundation 0x1940fe1c4 __CFRunLoopDoObservers + 548 20 CoreFoundation 0x1940fd8e0 __CFRunLoopRun + 1028 21 CoreFoundation 0x1940fd3f8 CFRunLoopRunSpecific + 608 22 GraphicsServices 0x1d768b4f8 GSEventRunModal + 164 23 UIKitCore 0x1965238a0 -[UIApplication _run] + 888 24 UIKitCore 0x196522edc UIApplicationMain + 340 25 MyApp 0x102c1f014 main + 140 26 dyld 0x1b6e52dcc start + 2240 By looking up information on the Exception Type and Termination Reason, I found that Apple officially mentions that EXC_BREAKPOINT (SIGTRAP) SIGNAL 5 Trace/BPT trap: 5 could be caused by Swift runtime error crashing mechanisms, mainly due to: If you use the ! operator to force unwrap an optional value that’s nil, or if you force a type downcast that fails with the as! operator, the Swift runtime catches these errors and intentionally crashes the app. For details, see the link: https://developer.apple.com/documentation/xcode/addressing-crashes-from-swift-runtime-errors My project is a mix of Objc+Swift compilation, the crash usually occurs after a button click triggers a change in UIView properties, mostly related to layout. All Swift code in the project is unrelated to this type of UI. So, I speculate that it might not be related to Swift runtime errors, but I'm unsure what other possible causes could lead to the aforementioned crash. A common denominator in all similar crash reports is that they occur on the main thread during system framework function calls, All show multiple instances of VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter CA::Layer::commit_if_needed is always invoked. I noticed many crashes relate to CALayer setting properties internally calling CAAnimation, so I added: @implementation CALayer (Animation) /// Prevent crashes + (void)disableAnimation:(VoidBlock)block{ [CATransaction begin]; [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions]; block(); [CATransaction commit]; } @end Using [CALayer disableAnimation:^{view.layer.someProperty = someValue;}] to disable animations has prevented some crashes, but I'm powerless in situations like the stack trace above, where all calls are made by system frameworks. I've also noticed other similar crash issues on forums: EXC_BREAKPOINT - libobjc.A.dylib object_getClass Crash on the main thread. The author experienced this issue after iOS 16 and iOS 17, with very similar stack information to mine. I suspect other potential causes might include: Whether it's related to KVO in UI code not being correctly released. Whether it involves calls to GPU resources from other threads. I've rewritten most of the code to ensure no GPU-related image operations occur on other threads during CoreAnimation runtime. Whether it's related to high memory usage and peak virtual memory. My app is related to image processing, and opening 4K photos for processing typically consumes more than 500MB of memory. If you've encountered similar situations or can help identify potential causes, please advise. Many thanks!

I have an app that displays an instrument dial that looks a bit like a speedometer or voltmeter with a circular face and a pointer. When operating, it updates perhaps once or twice a second, possibly more (it's triggered by data updates received by the network), using a CABasicAnimation as shown in the code below. But it's also quite possible that the dial is not visible to the user, for instance, if another tab view is active, or the dial is scrolled off-screen. What happens to animations on views/layers that aren't visible, do they just get discarded? I'm wondering if I should add a check of some sort in my code to minimize unnecessary performance hits. If so, how would I check if a UIView/CALayer is user-visible? I'm assuming animations are "efficient" in the way I imagine but you know what they say about assuming... func updateDialWithAnimation(degrees: CGFloat) { let radians = degrees * CGFloat.pi / 180 let animation = CABasicAnimation() animation.keyPath = "transform.rotation.z" animation.fromValue = CGFloat(angle.value) * CGFloat.pi / 180 animation.toValue = radians animation.duration = 0.33 angleLabel.text = String(Float(degrees)) angle.value = Float(degrees) // needle is a subclass of UIView needle.layer.add(animation, forKey: "basic") needle.layer.transform = CATransform3DMakeRotation(radians, 0, 0, 1) }

I am implementing pan and zoom features for an app using a custom USB camera device, in iPadOS. I am using an update function (shown below) to apply transforms for scale and translation but they are not working. By re-enabling the animation I can see that the scale translation seems to initially take effect but then the image animates back to its original scale. This all happens in a fraction of a second but I can see it. The translation transform seems to have no effect at all. Printing out the value of AVCaptureVideoPreviewLayer.transform before and after does show that my values have been applied. private func updateTransform() { #if false // Disable default animation. CATransaction.begin() CATransaction.setDisableActions(true) defer { CATransaction.commit() } #endif // Apply the transform. logger.debug("\(String(describing: self.videoPreviewLayer.transform))") let transform = CATransform3DIdentity let translate = CATransform3DTranslate(transform, translationX, translationY, 0) let scale = CATransform3DScale(transform, scale, scale, 1) videoPreviewLayer.transform = CATransform3DConcat(translate, scale) logger.debug("\(String(describing: self.videoPreviewLayer.transform))") } My question is this, how can I properly implement pan/zoom for an AVCaptureVideoPreviewLayer? Or even better, if you see a problem with my current approach or understand why the transforms I am applying do not work, please share that information.

with the latest Xcode that runs with Mac OS 14.5 Developer Beta has messages with a time and date in them There are also some other fields of an indeterminate origin/type. "2024-05-06 15:37:32.383996-0500 RoomPlanExampleApp[24190:1708576] [CAMetalLayerDrawable texture] should not be called after already presenting this drawable. Get a nextDrawable instead." specifically I need to know how the string [24190:1708576] relates to a location in my application so I can act on the message. I certainly can't find the text in the "[CAMetalLayerDrawable texture]". field anywhere in the user documentation OR the Development documentation. In order for a diagnostic message to be Actionable and remedied by a user it must identify the module and source line of the initiating code and there must be accessible documentation for users to access to get an explanation of potential remedies.. This interface fails to supply enough information to diagnose the problem. The label in [CAMetalLayerDrawable texture] cannot even be found in a search of the package information attached to the Xcode Release paired with the IOS and Mac OS system releases.

I've caught a very strange problem (THAT ONLY OCCURS ON REAL DEVICES) that has to do with using @NameSpace and MatchedGeometryEffect using NavigationStack. The problem is that if I go from the first screen to the second screen (on the second screen I have a View with MatchedGeometryEffect) , I get a strange bug where the MatchedGeometryEffect animation starts to work very badly (ONLY ON REAL DEVICE), it feels like the animation frame count drops to a minimum, but on simulator or preview everything works fine as it should. However, if I use the screen without NavigationStack, there is no such animation problem. What can this be related to ? And how can this be fixed ? It only takes a couple of lines of code to catch the animation problem, but it took all day to figure out what the problem is. FirstView struct NameSpaceTest2Navigation: View { @State private var nameSpaceTest2Path: [String] = [] var body: some View { NavigationStack { Button(action: { nameSpaceTest2Path.append("nameSpaceTest2") }, label: { Text("Button") }) .navigationDestination(for: String.self) { path in NameSpaceTest2() } } } } Second View struct NameSpaceTest2: View { @State private var selection: Int = 0 var body: some View { VStack { TabView(selection: $selection) { ForEach(0..<5, id: \.self) { _ in Color.white } } .tabViewStyle(.page(indexDisplayMode: .never)) } .overlay(alignment: .top) { NameSpaceTest2Header(selection: $selection) } } } Third View struct NameSpaceTest2Header: View { @Binding var selection: Int @Namespace var sectionUnderline var body: some View { ScrollViewReader { scrollReader in //START: ScrollViewReader ScrollView(.horizontal, showsIndicators: false) { //START: ScrollView HStack(spacing: 0) { //START: HStack ForEach(0..<5, id: \.self) { index in VStack { //START: VStack Text("Name: \(index)") .foregroundStyle(Color.green) .padding(.horizontal, 24) .padding(.vertical, 15) .overlay(alignment: .bottom) { if selection == index { Rectangle() .fill(Color.red) .frame(height: 5) .matchedGeometryEffect(id: "sectionUnderline", in: sectionUnderline, properties: .frame) .transition(.scale(scale: 1)) } } .animation(.smooth, value: selection) } //END: VStack .onTapGesture { withAnimation(.smooth) { scrollReader.scrollTo(index) selection = index } } .tag(index) } } //END: HStack } //END: ScrollView .onChange(of: selection, perform: { value in withAnimation(.smooth) { scrollReader.scrollTo(value, anchor: .center) } }) } //END: ScrollViewReader } } Try to repeat this code and run it on a real device with NavigationStack and you will get a bug with the animation, it will twitch like it has 5-10 frames per second. Then try to run Second View without Navigation Stack and you will get smooth animation, which is what it should be. What could be the problem ? How to get the smooth animation back ? Once again, you should only test on a real device.

Why do I get this error almost immediately on starting my rendering pass? Multiline BlockQuote. 2024-05-29 20:02:22.744035-0500 RoomPlanExampleApp[491:10341] [] <<<< AVPointCloudData >>>> Fig assert: "_dataBuffer" at bail (AVPointCloudData.m:217) - (err=0) 2024-05-29 20:02:22.744455-0500 RoomPlanExampleApp[491:10341] [] <<<< AVPointCloudData >>>> Fig assert: "_dataBuffer" at bail (AVPointCloudData.m:217) - (err=0) 2024-05-29 20:05:54.079981-0500 RoomPlanExampleApp[491:10025] [CAMetalLayer nextDrawable] returning nil because allocation failed. 2024-05-29 20:05:54.080144-0500 RoomPlanExampleApp[491:10341] [] <<<< AVPointCloudData >>>> Fig assert: "_dataBuffer" at bail (AVPointCloudData.m:217) - (err=0)

I've got a full-screen animation of a bunch of circles filled with gradients, with plenty of (careless) overdraw, plus real-time audio processing driving the animation, plus the overhead of SwiftUI's dependency analysis, and that app uses less energy (on iPhone 13) than the Xcode "Metal Game" template which is a rotating textured cube (a trivial GPU workload). Why is that? How can I investigate further? Does CoreAnimation have access to a compositor fast-path that a Metal app cannot access? Maybe another data point: when I do the same circles animation using SwiftUI's Canvas, the energy use is "Very High" and GPU utilization is also quite high. Eventually the phone's thermal state goes "Serious" and I get a message on the device that "Charging will resume when iPhone returns to normal temperature".

Recently I tried to apply a custom transition to a custom contextMenu. However, I want to make sure that during the transition process (which is not over yet), my contextMenu elements such as buttons can be tapped. But I tried a lot of things without success. I know you have a lot of experience, so I would like to ask you about how to implement the transition and be able to interact before it is over. I know that a UIView can be tapped during animation, but I haven't tried the button in a UIView. I've been trying to transition ViewControllers. For example, in a transition from fromViewController to toViewController, I wanted to be able to tap on a tableView in toViewController during the transition, but I was frustrated and found it very difficult to implement. I would like to ask you about the possibilities of interaction during the Viewcontrollers transition. (PS: In Github Issues, I uploaded a GIF example of the plus button on the left of the input box in iMessage. After tapping the plus button, you can tap the "Apple Cash" button before the transition is finished.) Your advice would be incredibly valuable to me. Thank you in advance for your time and assistance. [GithubLink]https://github.com/Juhnkerg/DemoForInteractionDuringTransition)

Our on field app is facing significant crashes at CA::Transaction::commit() from QuartzCore. The crash report does not point to any code in our app and the information available is very limited. It's a EXC_BAD_ACCESS KERN_INVALID_ADDRESS crash. We have tried using sanitisers and zombies but unable to reproduce the crash locally. Can someone help explain and point in right direction? Below are the crash details. Full crash report Distributor ID: com.apple.AppStore Hardware Model: iPhone15,3 AppStoreTools: 15F31e AppVariant: 1:iPhone15,3:16 Code Type: ARM-64 (Native) Role: Foreground Parent Process: launchd [1] Date/Time: 2024-06-03 20:41:59.3315 +0530 Launch Time: 2024-06-03 19:15:20.6051 +0530 OS Version: iPhone OS 17.4.1 (21E236) Release Type: User Baseband Version: 2.51.04 Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000110 Exception Codes: 0x0000000000000001, 0x0000000000000110 VM Region Info: 0x110 is not in any region. Bytes before following region: 4372119280 REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL UNUSED SPACE AT START ---> __TEXT 104994000-105420000 [ 10.5M] r-x/r-x SM=COW /var/containers/Bundle/Application/ Termination Reason: SIGNAL 11 Segmentation fault: 11 Terminating Process: exc handler [35195] Triggered by Thread: 0 Kernel Triage: VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter Thread 0 name: Thread 0 Crashed: 0 QuartzCore 0x000000018f4633b4 CA::Transaction::commit() + 1152 (CATransactionInternal.mm:480) 1 QuartzCore 0x000000018f4633ec CA::Transaction::commit() + 1208 (CATransactionInternal.mm:480) 2 QuartzCore 0x000000018f462e64 CA::Transaction::flush_as_runloop_observer(bool) + 88 (CATransactionInternal.mm:942) 3 UIKitCore 0x00000001900b1260 _UIApplicationFlushCATransaction + 52 (UIApplication.m:3160) 4 UIKitCore 0x00000001900b0d78 _UIUpdateSequenceRun + 84 (_UIUpdateSequence.mm:119) 5 UIKitCore 0x00000001900b0468 schedulerStepScheduledMainSection + 144 (_UIUpdateScheduler.m:1037) 6 UIKitCore 0x00000001900b0524 runloopSourceCallback + 92 (_UIUpdateScheduler.m:1186) 7 CoreFoundation 0x000000018ddc162c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1957) 8 CoreFoundation 0x000000018ddc08a8 __CFRunLoopDoSource0 + 176 (CFRunLoop.c:2001) 9 CoreFoundation 0x000000018ddbf0b8 __CFRunLoopDoSources0 + 340 (CFRunLoop.c:2046) 10 CoreFoundation 0x000000018ddbdd88 __CFRunLoopRun + 828 (CFRunLoop.c:2955) 11 CoreFoundation 0x000000018ddbd968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420) 12 GraphicsServices 0x00000001d20b34e0 GSEventRunModal + 164 (GSEvent.c:2196) 13 UIKitCore 0x0000000190230edc -[UIApplication _run] + 888 (UIApplication.m:3692) 14 UIKitCore 0x0000000190230518 UIApplicationMain + 340 (UIApplication.m:5282) 15 AppName 0x000000010542072c main + 64 (AppDelegate.swift:13) 16 dyld 0x00000001b12ded84 start + 2240 (dyldMain.cpp:1298)

I've got an iOS app that is using MetalKit to display raw video frames coming in from a network source. I read the pixel data in the packets into a single MTLTexture rows at a time, which is drawn into an MTKView each time a frame has been completely sent over the network. The app works, but only for several seconds (a seemingly random duration), before the MTKView seemingly freezes (while packets are still being received). Watching the debugger while my app was running revealed that the freezing of the display happened when there was a large spike in memory. Seeing the memory profile in Instruments revealed that the spike was related to a rapid creation of many IOSurfaces and IOAccelerators. Profiling CPU Usage shows that CAMetalLayerPrivateNextDrawableLocked is what happens during this rapid creation of surfaces. What does this function do? Being a complete newbie to iOS programming as a whole, I wonder if this issue comes from a misuse of the MetalKit library. Below is the code that I'm using to render the video frames themselves: class MTKViewController: UIViewController, MTKViewDelegate { /// Metal texture to be drawn whenever the view controller is asked to render its view. private var metalView: MTKView! private var device = MTLCreateSystemDefaultDevice() private var commandQueue: MTLCommandQueue? private var renderPipelineState: MTLRenderPipelineState? private var texture: MTLTexture? private var networkListener: NetworkListener! private var textureGenerator: TextureGenerator! override public func loadView() { super.loadView() assert(device != nil, "Failed creating a default system Metal device. Please, make sure Metal is available on your hardware.") initializeMetalView() initializeRenderPipelineState() networkListener = NetworkListener() textureGenerator = TextureGenerator(width: streamWidth, height: streamHeight, bytesPerPixel: 4, rowsPerPacket: 8, device: device!) networkListener.start(port: NWEndpoint.Port(8080)) networkListener.dataRecievedCallback = { data in self.textureGenerator.process(data: data) } textureGenerator.onTextureBuiltCallback = { texture in self.texture = texture self.draw(in: self.metalView) } commandQueue = device?.makeCommandQueue() } public func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) { /// need implement? } public func draw(in view: MTKView) { guard let texture = texture, let _ = device else { return } let commandBuffer = commandQueue!.makeCommandBuffer()! guard let currentRenderPassDescriptor = metalView.currentRenderPassDescriptor, let currentDrawable = metalView.currentDrawable, let renderPipelineState = renderPipelineState else { return } currentRenderPassDescriptor.renderTargetWidth = streamWidth currentRenderPassDescriptor.renderTargetHeight = streamHeight let encoder = commandBuffer.makeRenderCommandEncoder(descriptor: currentRenderPassDescriptor)! encoder.pushDebugGroup("RenderFrame") encoder.setRenderPipelineState(renderPipelineState) encoder.setFragmentTexture(texture, index: 0) encoder.drawPrimitives(type: .triangleStrip, vertexStart: 0, vertexCount: 4, instanceCount: 1) encoder.popDebugGroup() encoder.endEncoding() commandBuffer.present(currentDrawable) commandBuffer.commit() } private func initializeMetalView() { metalView = MTKView(frame: CGRect(x: 0, y: 0, width: streamWidth, height: streamWidth), device: device) metalView.delegate = self metalView.framebufferOnly = true metalView.colorPixelFormat = .bgra8Unorm metalView.contentScaleFactor = UIScreen.main.scale metalView.autoresizingMask = [.flexibleWidth, .flexibleHeight] view.insertSubview(metalView, at: 0) } /// initializes render pipeline state with a default vertex function mapping texture to the view's frame and a simple fragment function returning texture pixel's value. private func initializeRenderPipelineState() { guard let device = device, let library = device.makeDefaultLibrary() else { return } let pipelineDescriptor = MTLRenderPipelineDescriptor() pipelineDescriptor.rasterSampleCount = 1 pipelineDescriptor.colorAttachments[0].pixelFormat = .bgra8Unorm pipelineDescriptor.depthAttachmentPixelFormat = .invalid /// Vertex function to map the texture to the view controller's view pipelineDescriptor.vertexFunction = library.makeFunction(name: "mapTexture") /// Fragment function to display texture's pixels in the area bounded by vertices of `mapTexture` shader pipelineDescriptor.fragmentFunction = library.makeFunction(name: "displayTexture") do { renderPipelineState = try device.makeRenderPipelineState(descriptor: pipelineDescriptor) } catch { assertionFailure("Failed creating a render state pipeline. Can't render the texture without one.") return } } } My question is simply: what gives?

With the introduction of the new matchedTransitionSource from iOS 18, we can apply a zoom transition in the navigation view using .navigationTransition(.zoom) This works well for zoom animations. However, when I try to apply a matched geometry effect to views that are similar in the source and destination views, the zoom transition works, but those views don't transition seamlessly as they do with a matched geometry effect. Is it possible to still use matched geometry for subviews of the source and destination views along with the new navigationTransition? Here’s a little demo that reproduces this behaviour: struct ContentView: View { let colors: [[Color]] = [ [.red, .blue, .green], [.yellow, .purple, .brown], [.cyan, .gray] ] @Namespace() var namespace var body: some View { NavigationStack { Grid(horizontalSpacing: 50, verticalSpacing: 50) { ForEach(colors, id: \.hashValue) { rowColors in GridRow { ForEach(rowColors, id: \.self) { color in NavigationLink { DetailView(color: color, namespace: namespace) .navigationTransition( .zoom( sourceID: color, in: namespace ) ) .edgesIgnoringSafeArea(.all) } label: { ZStack { RoundedRectangle(cornerRadius: 5) .foregroundStyle(color) .frame(width: 48, height: 48) Image(systemName: "star.fill") .foregroundStyle(Material.bar) .matchedGeometryEffect(id: color, in: namespace, properties: .frame, isSource: false) } } .matchedTransitionSource(id: color, in: namespace) } } } } } } } struct DetailView: View { var color: Color let namespace: Namespace.ID var body: some View { ZStack { color Image(systemName: "star.fill") .resizable() .foregroundStyle(Material.bar) .matchedGeometryEffect(id: color, in: namespace, properties: .frame, isSource: false) .frame(width: 100, height: 100) } .navigationBarHidden(false) } } #Preview { ContentView() }

Repo is here Visual Description is here: Basically the red view should never be inside the blue view. The red view has a fixed aspect ratio. The blue view initially has an aspect ratio different from the red view and is animated to have the same aspect ratio. The red view is constrained inside the blue view as follows: let ac = brokenView.widthAnchor.constraint(equalTo: brokenView.heightAnchor, multiplier: 9/16) let xc = brokenView.centerXAnchor.constraint(equalTo: animView.centerXAnchor) let yc = brokenView.centerYAnchor.constraint(equalTo: animView.centerYAnchor) let widthC = brokenView.widthAnchor.constraint(equalTo: animView.widthAnchor) widthC.priority = .defaultLow let gewc = brokenView.widthAnchor.constraint(greaterThanOrEqualTo: animView.widthAnchor) let geHC = brokenView.heightAnchor.constraint(greaterThanOrEqualTo: animView.heightAnchor) geHC.priority = .required So the red view should start at equal width, but prioritize always been taller and wider than the blue view while staying centered and keeping a fixed aspect ratio. As you can see in the visual description it is not priortizing being taller. Any suggestions on how to fix, work around, or otherwise get past this would be appreciated. Really trying to avoid manually doing a spring animation with keyframes and an assload of math. I have filed a bug on feedback assistant, but figured someone here might have experience//know how. Thanks

When I use CAEmitterLayer on my screen, it does not affect performance no matter how many layers and particles I use. I always see CPU usage zero. Is it possible to know how CAEmitterLayer affects performance or even measure this?

We want to animate the images using animationImages propery of UIImageView in our app. There are 45 heif images with dimensions of 1668x2388. Below is the code i am using to animate images. let imageViewAnimation = UIImageView() imgViewAnimation.animationImages = images imgViewAnimation.animationDuration = 5.0 imgViewAnimation.animationRepeatCount = 1 imgViewAnimation.startAnimating() Timer.scheduledTimer(withTimeInterval: 5.0 + 0.5, repeats: false) { _ in DispatchQueue.main.async { self.showAlert() } } The issue i am facing is, it takes more than 5.0 seconds (animationDuration) to display all the images. Alert is shown before all the images are shown. We face this issue only for few sets of images. For some other sets, it is working fine. Is this issue due to heif images used, or due to memory and CPU load of using large number of images.