When I click the following button on the top of a preview phone, Xcode copies the preview phone for me. So if there is only one preview phone before clicking the button, there are two afterward.

My question is: How to remove the copied preview phone?

CodePudding user response：

Previews only happen because your code says they should happen. All this button really does is to modify the code that generates the preview(s). For example:

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            ContentView()
            ContentView()
        }
    }
}

See how it says ContentView() twice? That's two previews. To remove the second preview, revert the change. For example:

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}