SwiftUI. How To pass Binding variable to PreviewProvider

Hi, this is a short How-To to give you an example on how to pass Binding<> variable to PreviewProvider.

Let’s assume you have a SwiftUI view with the Binding variable, that looks something like this:

struct ExampleView: View {
    @Binding var isPlaying: Bool
		var body: some View {
				Button(action: {
	        self.isPlaying.toggle()
        }) {
          Image(systemName: isPlaying ? "pause.circle" : "play.circle")
        }
		}
}

In order to pass a Binding variable to ExampleView’s constructor in PreviewProvider you need to do the following:

struct ExampleView_Previews: PreviewProvider {
    static var previews: some View {
        ExampleView(isPlaying: .constant(true))
    }
}

JFY, you can wrap anything, depending of what type of Binding variable you have. For example:

struct ExampleView: View {
    @Binding var status: String = "pause"
		var body: some View {
				Button(action: {
	        self.status = "play"
        }) {
          Image(systemName: "\\(status).circle")
        }
		}
}

and PreviewProvider:

struct ExampleView_Previews: PreviewProvider {
    static var previews: some View {
        ExampleView(isPlaying: .constant("pause"))
    }
}

That’s it. Happy coding!