live preview problem

Question

Created Jan ’21

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I want to test the code below in live preview, but it seems not to work. In simulator, the button can change the text well, but not in live preview. How to fix it? Thanks in advance.

Code Block import SwiftUI
struct PreviewOnchangeTest: View {
    @Binding var toggle: Bool
    @State var text = "nice"
    var body: some View {
        VStack{
        	Text("\(text)")
            .onChange(of: toggle, perform: { value in
               		 text = toggle.description
            	})
        	Button(action: {toggle.toggle()}, label: {
            	Text("change")
       	  })
        }
    }
}
struct PreviewOnchangeTest_Previews: PreviewProvider {
    @State static var toggle = true
    static var previews: some View {
        PreviewOnchangeTest(toggle: $toggle)
    }
}

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Answer 1

OOPer OP

Jan ’21

As far as I know, SwiftUI cannot manage static @State variables properly.

Please try this:

Code Block struct ContainerView: View {
    @State var toggle = true
    var body: some View {
        PreviewOnchangeTest(toggle: $toggle)
    }
}
struct PreviewOnchangeTest_Previews: PreviewProvider {
    static var previews: some View {
        ContainerView()
    }
}

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