SwiftUI List performance

The following code, in an independent project works fine: struct ContentView: View { var body: some View { List { Text(Hello, world!) } } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } } The following code in a Widget Extension results in an error being displayed in the SwiftUI view (it builds fine): struct ContentView: View { var body: some View { List { Text(Hello, World!) } } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() .previewContext(WidgetPreviewContext(family: .systemMedium)) } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView().previewContext(WidgetPreviewContext(family: .systemMedium)) } }

Hi! Thank you for the Core ML Performance Report, it's a great tool! Is there a way to get peak memory footprint in addition to runtime? Thanks!

Hi!I am trying to add SCNAudioPlayer to my node that represent monster in the Scene, so I want play positional audio, such monster can be more than 1 etc(1-10) objects, so I clone root node of this monster and add AudioPlayer for each cloned node, but at this time I receive a huge performance issue that my frame rate decries from 60 to 30 frames/sec.Than I found one way that I can share 1 instance of SCNAudioSouce between all my copies, like it posible with geometry, but its not working for me, because SCNAudioPlayer added only to 1 node from 10 that I cloned.Source code:private lazy var _beeMinion: SCNReferenceNode = { if let filePath = Bundle.main.path(forResource: Bee Enemy, ofType: scn, inDirectory: art.scnassets), let refereceNode = SCNReferenceNode(url: URL(fileURLWithPath: filePath)) { return refereceNode } print(Node not loaded !!!) abort() }() var beeMinion: SCNReferenceNode { if !_beeMinion.isLoaded { _beeMinion.load() AudioEngine.instance.actionSoundPlayer?.play3DSound(.BeeMinion, node: _b

Our team use videotool box to do hardware-accelerated decoding and encoding. From iphone 6 to 7 plus, the performance of encoding increases, and it takes less time to transcode a video. However, the time spent on VTCompressionSessionEncodeFrame increases drastically on iphone 8 and newer models. For example, it takes about 650 us to encode a 720p frame on iphone 8 but 4100 us on iphone xs max. The other problem is, when i compare our app to a simple video recording app (both encode in 1080p), the time we spent on VTCompressionSessionEncodeFrame is almost 8 times as the recoding app. Is this normal?

We have a widget bundle with multiple widgets. I'm adding a widget that is interactive (iOS 17 and higher). Our widget code is in a static library that gets linked into the widget extension target in our main app Xcode project. I have SwiftUI buttons constructed with the intent constructor in our UI See https://developer.apple.com/documentation/swiftui/button/init(intent:label:) When I press the button the timeline refreshes (conforming to TimelineProvider) but the perform method doesn't seem to be called. I've seen multiple pieces of advice and none of them seem to work. I've tried on a physical device and a simulator. I've tried adding an AppIntentsPackage. I've tried including the AppIntent code in the app and the widget. I've tried setting the openAppWhenRun to true and false and not setting it at all. I've tried simplifying the intent to just printing out a line to the console and returning a result. At this point I have no idea how to debug this and I don't know what else to t

I am developing an app for Mac OSX and i need to perform a button click with code but i can't handle it.Anybody knows how to do this ??Just to remember i am coding to MAC.THANKS

Hi, I'm new to swiftUI and am having a few issues getting my head around how it works. My immediate issue is that I'm getting a response from an api in the form of a JSON string that I'm splitting into 2 arrays of my data model. This works fine and I have 2 lists in my view that if I change the binding in my list, the data changes to the other list. I can't seem to get it to change on a button click though. I want 2 buttons (one for each list) and clicking them will change the binding. I've got to the stage where I feel I'm soooooo close, but am missing something obvious. This is the code in my view: struct SplitView: View { @EnvironmentObject var viewRouter: ViewRouter @State var list1 = [MyModel]() @State var list2 = [MyModel]() private var viewingModels: [MyModel] { list1 } var body: some View { HStack { Button(action: { //selected = 1 }){ Text(List 1) } Button(action: { //selected = 2 }){ Text(List 2) } } List(viewingModels, id: .ID)

I am trying to publish your application on me, but I am facing a problem in reviewing the application Note that the application works efficiently without any problems on my device. Performance - App Completeness : an internet error message when we launched the app. Issue Description The app exhibited one or more bugs that would negatively impact App Store users. Bug description: an internet error message when we launched the app. Review device details: Device type: iPad Air (5th generation) and iPhone 13 mini OS version: iOS 17.6 app link (TestFlight) : https://testflight.apple.com/join/5HvH2sk1

While investigating some performance issues in my game app I found that AVAudioPlayerNode.play() is taking a long time to complete, sometimes close to 20 milliseconds (more than the time allotted for a single frame at 60 FPS).Currently I'm disconnecting and reconnecting player nodes with each play event to ensure they're connected with the proper format for the sound being played. Below is some example code (it uses Xcode's iOS game template and replaces the code in GameViewController.swift):import AVFoundation import GLKit import OpenGLES import QuartzCore final class GameViewController: GLKViewController { private let engine = AVAudioEngine() private let player = AVAudioPlayerNode() private var context: EAGLContext? private var buffer: AVAudioPCMBuffer? override func viewDidLoad() { // General set up. super.viewDidLoad() context = EAGLContext(api: .openGLES2) let view = self.view as! GLKView view.context = context! // Load audio buffer. let path = Bundle.main.path(forResource: test.wav, ofType: nil