I have built a SwiftUI FileDocument app like this. struct MyApp: App {     var body: some Scene {         DocumentGroup(newDocument: MyFileDocument()) { file in             DocumentView(document: file.$document)         }     } } I'm a bit confused how to use the $document Binding. I know with ObservableObject I can do: document.objectWillChange 		.sink { _ in 				print("Document changed") 		} How can I react to changes on $document in my Non-GUI code? Use case: I'm building an app, where for some changes in the document, there's a command sent over the network. This command should also be sent, if I use e.g. undo. That's why I don't want so send these updates from within my View but as a reaction to a change in $document.

I've pretty much completed creating my first macOS SwiftUI app. It's working fine but after using it for more than 10 minutes I noticed a dramatic slow down and big memory footprint. I condensed the problem down into the following minimal example, which is a full SwiftUI app for both macOS and iOS. language Swift import SwiftUI @main struct TestApp: App { @State var selection: Int? var body: some Scene { WindowGroup { NavigationView { List(0...10, id: \.self) { element in NavigationLink(destination: VeryComplexView(text: "\(element)"), tag: element, selection: $selection) { Text("\(element)") } } } } } } struct VeryComplexView: View { let text: String var body: some View { HStack { ForEach(1...10, id: \.self) { _ in List(1...5000, id: \.self) { element in Text("\(text) \(element)") } } } } } On macOS after just a few clicks in the NavigationView I'm getting a memory footprint of 1GB and performance decreases. Profiling the app with Leak Detector also shows a massive amount of leaks in SwiftUI classes. Compiling the same app for iOS stays at a reasonable footprint of 50 MB even after using it for a while. This bug prevents me from properly using my app. I submitted a bug report in Feedback Assistant about a month ago with no answer or reaction. Please help! How can such a huge leak stay unnoticed. I'm running the latest Big Sur 11.2.1 and Xcode 12.4

Hi there, I previously experienced a massive memory leak in SwiftUI on macOS which now seems to be fixed. CLICK - https://developer.apple.com/forums/thread/676860 But my app still becomes slower and memory footprint grows after some time of using it. I was able to created a new minimal but more extreme example to reproduce: This is a full app for SwiftUI. Compile for macOS (I'm using Xcode 12.4 macOS 11.2.3) import SwiftUI @main struct DemoApp: App {     @State var strings = ["Hello 1", "Hello 2"]     @State var bool = false     let timer = Timer.publish(every: 0.1, on: .main, in: .common).autoconnect()     @State var selected: Int?     var body: some Scene {         WindowGroup {             List(strings.indices, id: \.self, selection: $selected) { stringIndex in                 Text(strings[stringIndex])             }             .toolbar(content: {                 ForEach(1...100, id: \.self) { _ in                     Text("Hello World")                 }             })             .onReceive(timer) { input in                 if bool == true { selected = 0 }                 else { selected = 1 }                 bool = !bool             }         }     } } Timer is optional but it will show the problem more quickly. It seems to be connected to toolbar content a lot. Memory footprint quickly goes up, as well as CPU utilization & app slows down significantly just after a few seconds. Please help! What can I do? My app is pretty much not usable because of this bug. Johannes