ios – In SwiftUI how do I push a DetailView in a NavView when including a brand new merchandise to a Checklist?

Do that strategy, utilizing a NavigationPath with the NavigationStack, as proven, works for me. This code will ...make it so it programmatically opens the navigation view when including a brand new merchandise.

struct ContentView: View {
    var physique: some View {
        ListView()
    }
}

struct ColorDetail: View {
    var colour: Colour
    var physique: some View {
        Textual content(colour.description)
    }
}

struct ListView: View {
    @State var colours: [Color] = [.red] // <--- right here all colours have to be distinctive
    @State var path = NavigationPath()  // <-- right here
    
    var physique: some View {
        NavigationStack(path: $path) {  // <-- right here
            Checklist(colours, id: .self) { colour in   // <-- right here
                NavigationLink(colour.description, worth: colour)
            }
            .toolbar {
                Button("+") {
                    let newColor = Colour.blue  // <-- right here, a special colour
                    colours.append(newColor)
                    path.append(newColor)  // <-- right here
                }
            }
            .navigationDestination(for: Colour.self) { colour in
                ColorDetail(colour: colour)
            }
            .navigationTitle("Colours")
        }
    }
}

EDIT-1:

Close to your new query, right here is the code that can assist you to change the Colour within the ColorDetail.

struct ContentView: View {
    var physique: some View {
        ListView()
    }
}

struct ColorDetail: View {
    @Binding var mycolor: MyColor
    
    var physique: some View {
        Textual content(mycolor.colour.description)
        Picker("", choice: $mycolor.colour) {
            ForEach([Color.black, Color.pink, Color.yellow, Color.green], id: .self) { colour in
                Textual content(colour.description).tag(colour)
            }
        }
    }
}

struct MyColor: Identifiable, Hashable {
    let id = UUID()
    var colour: Colour
}

struct ListView: View {
    @State var myColors: [MyColor] = [MyColor(color: .red)]
    @State var path = NavigationPath()
    
    var physique: some View {
        NavigationStack(path: $path) {
            Checklist(myColors) { colour in
                NavigationLink(colour.colour.description, worth: colour)
            }
            .toolbar {
                Button("+") {
                    let newColor = MyColor(colour: .blue)
                    myColors.append(newColor)
                    path.append(newColor)
                }
            }
            .navigationDestination(for: MyColor.self) { colour in
                if let ndx = myColors.firstIndex(the place: {$0.id == colour.id}) {
                    ColorDetail(mycolor: $myColors[ndx])
                }
            }
            .navigationTitle("Colours")
        }
    }
}