SOLVED: Need some help with macOS menu items

@swsharpy

Apr '23

Below is a simple code to add a menu item under the "File" command. Basically, I want a subitem to be disabled when dataArray is empty and enabled when dataArray contains a value. The code runs, but does not update when I add a value to dataArray.

import SwiftUI

public var dataArray: [Int] = []

struct ContentView: View {
    @State var element: Int?
    var body: some View {
        VStack {
            TextField("Enter fisrt element", value: $element, format: .number)
                .onChange(of: element) { _ in
                    dataArray.append(element!)
                    print(dataArray)
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

and

import SwiftUI

@main
struct TestJSONApp: App {

    var body: some Scene {

        WindowGroup {
            ContentView()
        }

        .commands {
            CommandGroup(before: CommandGroupPlacement.newItem) {
                Button("Save data array to file") {
                    /* Do some stuff here */
                }
                .disabled(dataArray.isEmpty)
            }
        }
    }
}

@Hectorcrdna

Apr '23

Hi, In order to update the changes you need to create a class that conforms to ObservableObject and then add a @Published var array = [Int]() inside, then create an @StateObject var in the TestJSONApp and pass that var to content view as @ObservedObject.

Class

class DataArray: ObservableObject {
    @Published var array = [Int]()
}

ContentView

struct ContentView: View {
    @ObservedObject public var dataArray: DataArray

    @State var element: Int?
    var body: some View {
        VStack {
            TextField("Enter fisrt element", value: $element, format: .number)
                .onChange(of: element) { _ in
                    dataArray.array.append(element!)
                    print(dataArray.array)
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView(dataArray: DataArray())
    }
}

MainApp

@main
struct TestJSONApp: App {
    @StateObject var dataArray = DataArray()

    var body: some Scene {
        WindowGroup {
            ContentView(dataArray: dataArray)
        }
        .commands {
            CommandGroup(before: CommandGroupPlacement.newItem) {
                Button("Save data array to file") {
                    /* Do some stuff here */
                }
                .disabled(dataArray.array.isEmpty)
            }
        }
    }
}

@swsharpy

Apr '23

Thank you @Hectorcrdna !

I suspected that @ObserevdObject was needed, but kept going in circles trying to make it work. Tested your code and works beautifully. Now I need to look it over and understand exactly what is going on.

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