在SwiftUI中呈现新视图 [英] Present a new view in SwiftUI
问题描述
我想单击一个按钮,然后在UIKit中显示一个类似于present modally
的新视图
I want to click a button and then present a new view like present modally
in UIKit
我已经看过"如何使用工作表呈现新视图,但我不想将其作为模式表附加到主视图.
I have already seen "How to present a new view using sheets", but I don't want to attach it to the main view as a modal sheet.
我不想使用NavigationLink
,因为我不希望新视图和旧视图具有导航关系.
And I don't want to use NavigationLink
, because I don't want a new view and old view have a navigation relationship.
感谢您的帮助...
推荐答案
显示模式(iOS 13样式)
您只需要一个简单的sheet
即可自行关闭:
struct ModalView: View {
@Binding var presentedAsModal: Bool
var body: some View {
Button("dismiss") { self.presentedAsModal = false }
}
}
并像这样显示它:
struct ContentView: View {
@State var presentingModal = false
var body: some View {
Button("Present") { self.presentingModal = true }
.sheet(isPresented: $presentingModal) { ModalView(presentedAsModal: self.$presentingModal) }
}
}
请注意,我已将presentingModal
传递给模态,因此您可以将其从模态本身中消除,但是可以摆脱它.
Note that I passed the presentingModal
to the modal so you can dismiss it from the modal itself, but you can get rid of it.
您需要访问ViewController
.因此,您需要一些辅助容器和环境材料:
You need to access to the ViewController
. So you need some helper containers and environment stuff:
struct ViewControllerHolder {
weak var value: UIViewController?
}
struct ViewControllerKey: EnvironmentKey {
static var defaultValue: ViewControllerHolder {
return ViewControllerHolder(value: UIApplication.shared.windows.first?.rootViewController)
}
}
extension EnvironmentValues {
var viewController: UIViewController? {
get { return self[ViewControllerKey.self].value }
set { self[ViewControllerKey.self].value = newValue }
}
}
然后您应该使用实现此扩展名:
Then you should use implement this extension:
extension UIViewController {
func present<Content: View>(style: UIModalPresentationStyle = .automatic, @ViewBuilder builder: () -> Content) {
let toPresent = UIHostingController(rootView: AnyView(EmptyView()))
toPresent.modalPresentationStyle = style
toPresent.rootView = AnyView(
builder()
.environment(\.viewController, toPresent)
)
NotificationCenter.default.addObserver(forName: Notification.Name(rawValue: "dismissModal"), object: nil, queue: nil) { [weak toPresent] _ in
toPresent?.dismiss(animated: true, completion: nil)
}
self.present(toPresent, animated: true, completion: nil)
}
}
最后
您可以将其设置为fullscreen
,例如:
struct ContentView: View {
@Environment(\.viewController) private var viewControllerHolder: UIViewController?
var body: some View {
Button("Login") {
self.viewControllerHolder?.present(style: .fullScreen) {
Text("Main") // Or any other view you like
// uncomment and add the below button for dismissing the modal
// Button("Cancel") {
// NotificationCenter.default.post(name: Notification.Name(rawValue: "dismissModal"), object: nil)
// }
}
}
}
}
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