每次单击按钮时，SwiftUI都会在两个文本之间切换

import SwiftUI

struct ContentView: View {
    @State private var isTextVisible = false
    
    var body: some View {
        VStack {
            if isTextVisible {
                Text("Hello")
            } else {
                Text("World")
            }
            
            Button(action: {
                self.isTextVisible.toggle()
            }) {
                Text("Toggle")
            }
        }
    }
}

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