Great！！Inspired by your answers, I find that ".buttonStyle(BorderlessButtonStyle())" is the key point. If I apply it to Button view in my code above. The action block indeed works! But I can't get the reason. In addition, how could I prevent the onTapGesture block from working for Button? In other words, how could I make action block work only(mask the onTapGesture block )?

I have tried 4 methods above one by one: Disabling "Connect Hardware Keyboard" seems only to affect the behavior of simulators, but not the canvas. I switch to different simulators, include iPhone & iPad. But the problem is still there. I add a new swiftui view and make it to have the simplest code. But it is still no go. struct TextFieldPopupView: View {     @State private var text = ""     var body: some View {         TextField("Hello", text: $text)             .textFieldStyle(RoundedBorderTextFieldStyle())     } } struct TextFieldPopupView_Previews: PreviewProvider {     static var previews: some View {         TextFieldPopupView()     } } 4. Removing derived data has no effect yet. Thank you all the same.