Detecting when state variable changes

I tried using willSet or didSet on an @State variable, but it didn’t work

@State var consumed: Bool = false {
    didSet {
        print("never called")
    }
}

Instead what works is to use the onChange event:

Toggle("My toggle", isOn: $consumed)
    .onChange(of: self.consumed) { v in
        print("is called")
    }