Performing actions / working with gestures via Live Preview (SwiftUI)

Question

I have CustomToggle and I want to test it via Live Preview. The problem is that tapping on toggle via Live Preview does nothing, but works well when running Simulator.

struct CustomToggle: View {
    @Binding var isOn: Bool

    // ... displaying CustomToggle view
    // ... and toggling isON onTapGesture

}

struct CustomToggle_Previews: PreviewProvider {
    @State static var isOn = true
    static var previews: some View {
        CustomToggle(isOn: $isOn)
    }
}

Answer 1

You can define a struct for this purpose:

struct StatefulPreviewWrapper<Value, Content: View>: View {
    @State var value: Value
    var content: (Binding<Value>) -> Content

    var body: some View {
        content($value)
    }

    init(_ value: Value, content: @escaping (Binding<Value>) -> Content) {
        self._value = State(wrappedValue: value)
        self.content = content
    }
}

Then use it in your preview like this:

struct CustomToggle_Previews: PreviewProvider {
    static var previews: some View {
        StatefulPreviewWrapper(false) { CustomToggle(isOn: $0) }
    }
}