How to create an inverted Toggle in SwiftUI?-CodePudding

I'm trying to create a view that has two toggles that both operate off the same variable, but the twist is that I want one to be the inverse of the variable and only be toggled on when the variable is false.

At first I looked for a simple way to invert the isOn variable with a well placed exclamation point:

> Toggle(isOn: $myStruct.myBooleanVar) {
                            Text("Yes").frame(width: 80)
                        }.toggleStyle(.button)
                        Toggle(isOn: $myStruct.!myBooleanVar) {
                            Text("no").frame(width: 80)
                        }.toggleStyle(.button)

I was unsuccessful

'.!' is not a binary operator

Next I looked to see if there was a modifier I could put on the toggle to invert it. Something like:

> Toggle(isOn: $myStruct.myBooleanVar) {
                            Text("Yes").frame(width: 80)
                        }.toggleStyle(.button)
                        Toggle(isOn: $myStruct.myBooleanVar) {
                            Text("no").frame(width: 80)
                        }.toggleStyle(.button)
                        .inverted(true)

I found no such modifier

Next I tried using procedural variables, state variables, and custom binding variables, but they all gave the same error:

Cannot use instance member 'settings' within property initializer; property initializers run before 'self' is available

CodePudding user response：

you could try this approach to have ...two toggles that both operate off the same variable, but the twist is that I want one to be the inverse of the variable and only be toggled on when the variable is false.:

   Toggle(isOn: $myBooleanVar) {
    Text("Yes").frame(width: 80)
}

Toggle(isOn: Binding(
    get: { !myBooleanVar },
    set: { if !$0 { myBooleanVar = !$0 } } )) {  // <-- more logic if required
        Text("no").frame(width: 80)
    }