Seems the best way for me is go to the Flutter world. HeHe. Congratulations for finding the best for you. May your app be great.

Can you show a complete code to reproduce the issue?

Can you show a complete code which can reproduce the issue?

How do I do this? I've been wrestling with all kinds of different syntax and can't figure it out. Can you show some of them? Frankly, I do not understand what you are trying to do, and expecting some codes would make it clearer.

Thanks for showing the additional code. But unfortunately, your code contains some unknown things: OrderedSet, IncomingMessage, Message, ChatMessageCell. Someone would be able to help you with the currently shown info, but I cannot. Hope your issue would be solved soon. Good luck.

 I'm trying to avoid the use of a global variable, as that's a poor solution, Please do not forget, using too many class variable is as poor as, or poorer than using a global variable. but I'm starting to wonder if Swift supports the concept of these class variables in the same way that other languages I've used do. What sort of languages are you accustomed? You can write something like this: class Foo { private static var _a: String = "" class var a: String { set { self._a = newValue } get { return self._a } } } class Bar: Foo { func printit() { print(Foo.a) } } Foo.a = "abc" let someBar = Bar() someBar.printit() But not sure if this is what you want.

I created a macOS Command Line Tool project with Language: C++, and copied your code into main.cpp. And it compiled without any issues. What have you done with Xcode? Please clarify.

My internet connection is slow. I don't want to download 11 GB Xcode. Could someone help me? Better find a good place where you can use broadband internet. The recent Xcode works with tight communications with Apple's servers. You will meet many other messages and cannot run or distribute your app unless you do things in the right way. Generally, installing Xcode through More Download pages - https://developer.apple.com/download/more/ may work in a little less stable communications environment, but you need to download 11GB Xcode and many more hidden components.

Writing an initialization code of Views in Button actions does not make sense. Write a code to show other views using NavigationLink or sheet or something else, and change the @State variable for it.

(Sorry, I was missing the word macOS.) You can find some old threads for macOS. Some examples: https://developer.apple.com/forums/thread/14485 Or https://stackoverflow.com/questions/28139294/how-does-one-display-a-new-view-controller-in-the-same-mac-window Can't you find anything useful in any of them?

Have you tried installing the latest Xcode (12.5) from the More Downloads page - https://developer.apple.com/download/more/?

maybe someone can think about developing one. Unfortunately, there are many agreements or contracts between Apple and us developers. So, most developers believe that third party developers cannot develop a fully functional IDE on iPhone or iPad. You can write a feature request to Apple using the Feedback Assistant - https://developer.apple.com/bug-reporting/. You may already know and may not think it as a fully functional development tool, but Swift Playgrounds is a good tool to learn programming in Swift.

MIDICompletionProc is a typealias of a closure type, as shown in the doc - https://developer.apple.com/documentation/coremidi/midicompletionproc. typealias MIDICompletionProc = (UnsafeMutablePointerMIDISysexSendRequest) - Void You may need to pass a global function or a closure of @convention(c). completionRefCon is any type of pointer which points to some stable address while MIDI process is running. Or it can be nil. So, for example, you can write something like this: // Define a global function, somewhere outside any classes func handleMIDISysexSendRequestCompletion(_ request: UnsafeMutablePointerMIDISysexSendRequest) { //... } class SomeClass { //... func someFunc(...) { //... var request = MIDISysexSendRequest( destination: endPoint, data: dataPointer, bytesToSend: dataSize, complete: isComplete, reserved: (0,0,0), completionProc: handleMIDISysexSendRequestCompletion, completionRefCon: nil ) let result = MIDISendSysex(&request) print(result) //... } }

Please show the definition of the protocol Handler, and show the precise code to represent what you did. With shown a code with bunch of syntax errors, it is hard to say what's causing the issue. And please do not forget to use Code block (icon ``) of this site when showing some code.

Ok, but I am still wondering about how to get the things to trigger if setIconPurchased = true Maybe you need to clarify when you expect setIconPurchased gets true and when if setIconPurchased is executed.