SwiftUIでモーダルからフルモーダルを表示する
SwiftUIでモーダルからフルモーダルを表示する方法です。 以下の記事の改良版？です。
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| import SwiftUI | |
| import UIKit | |
| struct ContentView: View { | |
| @Environment(\.viewController) private var viewControllerHolder: ViewControllerHolder | |
| @State private var isPresented = false | |
| private var viewController: UIViewController? { | |
| self.viewControllerHolder.value | |
| } | |
| var body: some View { | |
| VStack { | |
| Button(action: { | |
| self.isPresented = true | |
| }) { | |
| Text("Show Modal") | |
| } | |
| .sheet(isPresented: $isPresented) { | |
| ModalView() | |
| } | |
| Button(action: { | |
| self.viewController?.present( | |
| presentationStyle: UIModalPresentationStyle.overCurrentContext, | |
| transitionStyle: UIModalTransitionStyle.crossDissolve, | |
| animated: true) { | |
| FullModalView() | |
| } | |
| }) { | |
| Text("Show Full Modal") | |
| } | |
| } | |
| } | |
| } | |
| struct ModalView: View { | |
| @Environment(\.viewController) private var viewControllerHolder: ViewControllerHolder | |
| private var viewController: UIViewController? { | |
| self.viewControllerHolder.value | |
| } | |
| var body: some View { | |
| Button(action: { | |
| self.viewController?.present( | |
| presentationStyle: UIModalPresentationStyle.fullScreen, | |
| transitionStyle: UIModalTransitionStyle.crossDissolve, | |
| animated: true) { | |
| FullModalView() | |
| } | |
| }) { | |
| Text("Show Full Modal") | |
| } | |
| } | |
| } | |
| struct FullModalView: View { | |
| @Environment(\.viewController) private var viewControllerHolder: ViewControllerHolder | |
| private var viewController: UIViewController? { | |
| self.viewControllerHolder.value | |
| } | |
| var body: some View { | |
| Button(action: { | |
| self.viewController?.dismiss(animated: true, completion: nil) | |
| }) { | |
| Group { | |
| VStack { | |
| Text("Modal") | |
| } | |
| .frame(width: 200, height: 200, alignment: .center) | |
| .background(Color.white) | |
| } | |
| .onAppear() { | |
| DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) { | |
| self.viewController?.dismiss(animated: true, completion: nil) | |
| } | |
| } | |
| .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity) | |
| .background(Color.gray.opacity(0.5)) | |
| .edgesIgnoringSafeArea(.all) | |
| } | |
| } | |
| } | |
| struct ViewControllerHolder { | |
| weak var value: UIViewController? | |
| init(_ value: UIViewController?) { | |
| self.value = value | |
| } | |
| } | |
| struct ViewControllerKey: EnvironmentKey { | |
| static var defaultValue: ViewControllerHolder { | |
| guard var visibleViewController = UIApplication.shared.windows.first?.rootViewController else { | |
| return ViewControllerHolder(nil) | |
| } | |
| while let vc = visibleViewController.presentedViewController { | |
| visibleViewController = vc | |
| } | |
| return ViewControllerHolder(visibleViewController) | |
| } | |
| } | |
| extension EnvironmentValues { | |
| var viewController: ViewControllerHolder { | |
| get { return self[ViewControllerKey.self] } | |
| set { self[ViewControllerKey.self] = newValue } | |
| } | |
| } | |
| extension UIViewController { | |
| func present<Content: View>( | |
| presentationStyle: UIModalPresentationStyle = .automatic, | |
| transitionStyle: UIModalTransitionStyle = .coverVertical, | |
| animated: Bool = true, | |
| backgroundColor: UIColor = .clear, | |
| completion: @escaping () -> Void = {}, | |
| @ViewBuilder builder: () -> Content) { | |
| let toPresent = UIHostingController(rootView: AnyView(EmptyView())) | |
| toPresent.rootView = AnyView( | |
| builder() | |
| .environment(\.viewController, ViewControllerHolder(toPresent)) | |
| ) | |
| toPresent.view.backgroundColor = backgroundColor | |
| toPresent.modalPresentationStyle = presentationStyle | |
| toPresent.modalTransitionStyle = transitionStyle | |
| self.present(toPresent, animated: animated, completion: completion) | |
| } | |
| } | |
| struct ContentView_Previews: PreviewProvider { | |
| static var previews: some View { | |
| ContentView() | |
| } | |
| } |