How to create a toggle switch

SwiftUI’s toggle lets users move between true and false states, just like UISwitch in UIKit.

For example, we could create a toggle that either shows a message or not depending on whether the toggle is enabled or not, but of course we don’t want to have to track the state of the toggle by hand – we want SwiftUI to do that for us.

Instead we should define a @State Boolean property that will be used to store the current value of our toggle. We can then use that to show or hide other views as needed.

For example:

struct ContentView : View {
    @State var showGreeting = true

    var body: some View {
        VStack {
            Toggle(isOn: $showGreeting) {
                Text("Show welcome message")
            }.padding()

            if showGreeting {
                Text("Hello World!")
            }
        }
    }
}

I’ve made that code so that a text view is returned only when showGreeting is true, which means the VStack will decrease in size when showGreeting is false – it doesn’t have a second view in its stack.