SwiftUI—如何激活表单以及如何使表单失效

struct ContentView : View {
    @State var enableForm = false //用来表示是否激活表单
    @State var enableNotification = false //和开关视图进行绑定
    @State var userName = "" //用户名
    @State var password = "" //密码
    var body: some View {
        NavigationView {
            Form {
                Toggle(isOn: $enableForm) { //使用该视图激活或取消激活表单
                    Text("Enable Form")
                }
                Section(header: Text("Please enter your information:")) {
                    TextField("Username", text: $userName)
                    SecureField("Password", text: $password)
                    Toggle(isOn: $enableNotification) {
                        Text("Enable Notification")
                    }
                }.disabled(enableForm)
            }.navigationBarTitle(Text("Profiles"))
        }
    }
}