这是 Login() 视图:
struct Login: View {
@Environment(\.presentationMode) var presentationMode
var body: some View{
VStack{
HStack{
Button(action: {
presentationMode.wrappedValue.dismiss()
}) {
Image(systemName: "xmark")
.resizable()
.frame(width: 18, height: 18)
}
}
NavigationLink(destination: CreateAccount().navigationBarBackButtonHidden(true), label: {
Text("create account")
// and close the current view Login()
})
}
}
}
是否可以打开一个新视图,在本例中为 CreateAccount() 并关闭当前视图 Login()?
为了做到这一点,我建议完全跳过
NavigationView
,请参阅 here 了解更多信息。您的情况的示例:
//You need an `ObservedObject` to do this, and a overall holder view
enum ViewStates{
//Declare possible views
case ContentView
case Login
case CreateAccount
}
//Then use an observableObject
class viewControl: ObservableObject{
@Published var currentView: ViewStates = .ContentView
}
//Finally, pass this into your views. Take a look at the second part of the tutorial I posted below for more info
//such as using `EnvironmentObject` and adding animation. Example implimentation below:
struct ControllerView: View{
@StateObject var controller: viewControl
var body: some View{
switch controller.currentView{
case .ContentView:
ContentView(controller: controller)
case .Login:
Login(controller: controller)
case .CreateAccount:
CreateAccount(controller: controller)
}
}
}
接下来,您的所有视图中都需要有
@ObservedObject var controller: viewControl
。请注意,您不需要在 switch 子句中使用默认语句,因为 enum
声明了所有可能的值。以下是 CreateAccount 视图的示例。您也不再需要解雇 - 事实上,这将不再起作用。
struct CreateAccount: View{
@ObservedObject var controller: viewControl
var body: some View{
//Content
Button("Dismiss"){
controller.currentView = .ContentView
}
}
}
这将允许您通过单击来切换视图。不要在 ContentView 中使用 NavigationLink,而是执行以下操作:
Button{
controller.currentView = .CreateAccount
} label: {
Text("Create Account")
}
要返回,您只需再次设置该值即可。这也可以扩展以显示更多视图。