Picker with Menu does not work with Int32 but it works with Int

Question

This code does not work, meaning onChange is never called and the variable is not changed when a dropdown option is selected.

struct ExamplePicker: View {
    
    @State var val: Int32 = 2
    
    var body: some View {
        HStack {
            
            Menu {
                
                Picker(selection: $val, label: EmptyView()) {
                    
                    Text("Val1").tag(1)
                    Text("Val2").tag(2)
                    Text("Val3").tag(3)
                }                   
            } label: {
                HStack {
                    Text("Value: ")
                    Spacer()
                    
                    Text(String(format: "%d", val))
                    
                    Spacer()
                }
            }
            .onChange(of: val) { newSelection in
               print(">>> HERE")
           }    
        }
    }
}

but if you change val to type Int it works perfectly fine. This looks like a bug to me

EDIT: Solved - the problem is that in .tag() you need the EXACT same type. so .tag(1) would be Int not Int32. and thus .tag(Int32(1)) is needed

just to make it more confusing, this works:

struct ExamplePicker: View {
    
    @Binding var val: Int64
    
    var body: some View {
        HStack {
            
            Picker(selection: $val, label: EmptyView()) {
                
                Text("Val1").tag(1)
                Text("Val2").tag(2)
                Text("Val3").tag(3)
            }
            .onChange(of: val) { newSelection in
                print(">>> HERE")
            }   
        }
    }
}

Answer 1

It works fine when the tag values of the Picker items have the same type as the state variable. Like this:

Picker(selection: $val, label: EmptyView()) {
    Text("Val1").tag(Int32(1))
    Text("Val2").tag(Int32(2))
    Text("Val3").tag(Int32(3))
}