SafariViewController auth screen blank if presented from inside a SwiftUI ScrollView

[jnpdx]

I don't know that this is a bug that the Dropbox team can fix as it may just be an issue inherent to SwiftUI, but I thought I'd write up an issue that others may finding searching since it caught me for a couple of hours this morning until I figured it out.

If the auth flow is initiated from SwiftUI, if the UIViewController passed to the DropboxClientsManager resides in a ScrollView, the resulting SafariViewController won't load the Dropbox page. It'll either be completely blank, or uninitialized (eg just say "Website name" at the top).

Here's reproducible code (iOS 13.4) -- note that removing the ScrollView from ContentView solves the problem:

struct ContentView : View {
    @State var isShown = false
    
    var body : some View {
        ScrollView {
            VStack {
                Text("HI!")
                Button(action: {
                    self.isShown.toggle()
                }) {
                    Text("Dropbox....")
                }
                DropboxView(isShown: $isShown)
            }
        }
    }
}


struct DropboxView: UIViewControllerRepresentable {
    typealias UIViewControllerType = UIViewController
    
    @Binding var isShown : Bool

    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
        if isShown {
            DropboxClientsManager.authorizeFromController(UIApplication.shared,
            controller: uiViewController,
            openURL: { (url: URL) -> Void in
                UIApplication.shared.open(url, options: [:], completionHandler: nil)
            })
        }
    }

    func makeUIViewController(context _: Self.Context) -> UIViewController {
        return UIViewController()
    }
}

[greg-db]

Thanks for writing this up! I'll ask the team to take a look over this in case this is something we can fix on our side.

Also, in case it's relevant, I noticed this in the console when reproducing this with the ScrollView:

Presenting view controllers on detached view controllers is discouraged <UIViewController: 0x7fe9f3804430>.

[amoshsueh]

I can't believe that after more than one year there is still no support for SwiftUI, this should be a basic requirement to be a SDK for development.

[greg-db]

Thanks for the feedback!

[greg-db]

The team has updated SwiftyDropbox to support SwiftUI in the latest version of the SDK (v9.1.0). Let us know if you try that and run in to any issues. Thanks!