Swift @Binding init

Question

How do I manually init a Swift Binding, with a desired wrapped value?

Using Bool as type, here is most basic desired init

let b: Binding<Bool> = Binding.init(true) //errors out with messages:

Cannot convert value of type 'Bool' to expected argument type 'Binding<Bool?>

Value of optional type 'Binding<Bool>?' must be unwrapped to a value of type 'Binding<Bool>'

Questions I have

1. Why does the above error out?
2. What is the correct syntax to init a simple Bool binding
3. Why must optionals be involved in the type signature (<'Binding<Bool?>)

Answer 1

You rather need @State. If you want default initial value along with the opportunity to set it, consider this.

@State var a: Bool
init(initialA: Bool = true) {
    _a = .init(initialValue: initialA)
}