Dismiss a SwiftUI View that is contained in a UIHostingController

Question

I have rewritten my sign in view controller as a SwiftUI View. The SignInView is wrapped in a UIHostingController subclass (final class SignInViewController: UIHostingController<SignInView> {}), and is presented modally, full screen, when sign in is necessary.

Everything is working fine, except I can't figure out how to dismiss the SignInViewController from the SignInView. I have tried adding:

@Environment(\.isPresented) var isPresented 

in SignInView and assigning it to false when sign in is successful, but this doesn't appear to interop with UIKit. How can I dismiss the view?

Answer 1

I found another approach that seems to work well and which feels a little cleaner than some of the other approaches. Steps:

1. Add a dismissAction property to the SwiftUI view:

struct SettingsUIView: View {     var dismissAction: (() -> Void)     ... }     

2. Call the dismissAction when you want to dismiss the view:

Button(action: dismissAction ) {     Text("Done") } 

3. When you present the view, provide it with a dismissal handler:

let settingsView = SettingsUIView(dismissAction: {self.dismiss( animated: true, completion: nil )}) let settingsViewController = UIHostingController(rootView: settingsView )  present( settingsViewController, animated: true ) 

Answer 2

UPDATE: From the release notes of iOS 15 beta 1:

isPresented, PresentationMode, and the new DismissAction action dismiss a hosting controller presented from UIKit. (52556186)

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I ended up finding a much simpler solution than what was offered:

 final class SettingsViewController: UIHostingController<SettingsView> {     required init?(coder: NSCoder) {         super.init(coder: coder, rootView: SettingsView())         rootView.dismiss = dismiss     }      func dismiss() {         dismiss(animated: true, completion: nil)     } }  struct SettingsView: View {     var dismiss: (() -> Void)?          var body: some View {         NavigationView {             Form {                 Section {                     Button("Dimiss", action: dismiss!)                 }             }             .navigationBarTitle("Settings")         }     } }