I have the following construct

import SwiftUI

class TopClass: ObservableObject {
    @Published var someArr = [SomeClass(), SomeSubclass()]
}

class SomeClass: Identifiable {
    let id = UUID()
}

class SomeSubclass: SomeClass {
    var toggle = true
}

struct ContentView: View {
    @ObservedObject var topClass = TopClass()
    var body: some View {
        ForEach($topClass.someArr) {
            $value in
            if let someSubclass = $value as? SomeSubclass  {
                Toggle("Test", isOn: someSubclass.toggle)
            }
        }
    }
}

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

I can`t figure out if it is possible to somehow bind someSubclass.toggle to isOn of the Toggle. I solution or a hint to where I could research this would be very appreciated.

CodePudding user response：

If you are really hell-bent on using this approach, then try this example code:

struct ContentView: View {
    @ObservedObject var topClass = TopClass()
    
    var body: some View {
        ForEach($topClass.someArr) { $value in
            if let someSubclass = $value.wrappedValue as? SomeSubclass  {
                Toggle("test", isOn: Binding<Bool> (
                    get: { someSubclass.toggle },
                    set: {
                        topClass.objectWillChange.send()
                        someSubclass.toggle = $0
                    })
                )
            }
        }
    }
}