if you know what is the caused that lead me to wrap those methods with DispatchQueue.main.async{} as stated above please let me know hehe Thanks for sharing your experience. But unfortunately, whether enclosing with DispatchQueue.main.async{...} or not does not affect the behavior of my test project, so I have nothing to tell you right now. Please share your info when you find something new, I will be watching on this thread.

As far as I tried, UIDocumentPickerViewController shows the file saved in the Documents directory. (For plist files, "com.apple.property-list" seems to be the right type specifier.) Have you set Info.plist of your app properly? You need to set both UIFileSharingEnabled and LSSupportsOpeningDocumentsInPlace to YES.

I can't save the color there next to the appicon in the small color square with the white color, while I set the color(any) to the large Universal squares. Sorry, but as far as I tried, I cannot get the screen you have described. What version of Xcode are you using? Are you sure you have chosen Color Set after pressing the + button at the left bottom? Can you share the screen shot of your Assets editor by any means? (It's a pity this site does not have an image sharing feature yet.)

Maybe it needs to type the right command in the terminal ?  No, never.

Sorry, bug your description and code are too vague and I do not understand what you really want to do? when users press a button in another view called Play In your code, there is no button in the view Play. I have created a view called Graph  Your Play has a view named ViewGraph inside, is it the same as the view called Graph? a graph is displayed What triggers the graph to be displayed? Can you show the whole code of Graph (or ViewGraph) ?

What am I missing? Maybe it is caused by some implementation details of the current SwiftUI in the similar way where .sheet cannot handle @State vars. A simple workaround: import SwiftUI @main struct MenuTestApp: App { 		@State var active = false 		var body: some Scene { 				WindowGroup { 						ContentView() 				} 				.commands(content: { 						CommandMenu("Tools", content: { 								Button("Normally active", action: {active = !active}).disabled(active) 								Button("Normally inactive", action: {active = !active}).disabled(!active) 						}) 						CommandGroup(after: .newItem, addition: { 								MyCommandGroup(active: $active) 						}) 				}) 		} } struct MyCommandGroup: View { 		@Binding var active: Bool 		var body: some View { 				Button("Normally active", action: {active.toggle()}).disabled(active) 				Button("Normally inactive", action: {active.toggle()}).disabled(!active) 		} }

I probably need to assign a color name with swift code 5. The color in the little square next to the appicon is already there. You can edit the asset names by long-clicking on the names, no need to write code in Swift.

I solved the problem, thank you. Thanks for reporting. Please mark the right answer as the solution if there is. Or else, please post an answer by yourself and mark it as the solution.

There is a new non-blocking error : DocumentManager] Failed to associate thumbnails for picked URL  ... Some articles on the web say, that you can safely ignore it. If you find something non-ignorable with this message, you should better start a new thread.

If the transfer works then my sendData() method up top would print a statement but my addToFav only prints "favourite button pressed". Then I guess delegate is nil when sendData() is called. By the way, please follow the simple coding rule of Swift -- type names should start with Capital letter. Your code is hard to read.

When you want to test a simple expression like print("Hello, World!") on the top level, it needs to be written in a fixed file main.swift, no other file names are allowed. And main.swift would only work with the project template: macOS Command Line Tool. Create a new project macOS Command Line Tool, and edit main.swift. Or if you want to test your code in a GUI app, you need to move the line print("Hello, World!") into some function.

I ran into this issue when I was using either @ObservedObject or @StateObject and the boolean controlling the button state would be @Published in the corresponding class. I guess such things may cause issue when used with .sheet as well.

Swift Array has many methods to search, an example: let searchIdNumber = 2 if let foundHorse = myHorses.first(where: {$0.idNumber == searchIdNumber}) { 		print(foundHorse.name) } else { 		print("Not Found") } Better check the part Finding Elements in the documentation of Array - https://developer.apple.com/documentation/swift/array.

As far as I tried, I could save a file using UIActivityViewController with the same settings in Info.plist. My app name appears under On My iPhone after choosing Save to Files, very similar to UIDocumentPickerViewController. I also would like to be able for the user to select/change the file name User can tap the name where save button is active, to rename the saved file. [ShareSheet] cancelled request - error: The operation couldn’t be completed. Invalid argument I could not reproduce this error. Have no idea what's affecting.

I intialized my delegate to not be nil  Hidden parts of your code may be affecting. For example, The actual instance of the view controller running sendData() may not be the same instance you initialized. If you could show enough code, we would not need such guess game.