Using Uiapplicationdelegateadaptor to Get Callbacks from Userdidacceptcloudkitsharewith Not Working

Using UIApplicationDelegateAdaptor to get callbacks from userDidAcceptCloudKitShareWith not working

In Scene-based application the userDidAcceptCloudKitShareWith callback is posted to Scene delegate, but in SwiftUI 2.0 App-based application the scene delegate is used by SwiftUI itself to provide scenePhase events, but does not provide native way to handle topic callback.

The possible approach to solve this is to find a window and inject own scene delegate wrapper, which will handle userDidAcceptCloudKitShareWith and forward others to original SwiftUI delegate (to keep standard SwiftUI events working).

Here is a couple of demo snapshots based on https://stackoverflow.com/a/63276688/12299030 window access (however you can use any other preferable way to get window)

@main
struct athlyticSocialTestAppApp: App {
    @StateObject var shareDataStore = ShareDataStore.shared 
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    let sceneDelegate = MySceneDelegate()
    
    var body: some Scene {
        WindowGroup {
            ContentView().environmentObject(shareDataStore)
              .withHostingWindow { window in
                 sceneDelegate.originalDelegate = window?.windowScene.delegate
                 window?.windowScene.delegate = sceneDelegate
              }
        }
    }
}

class MySceneDelegate : NSObject, UIWindowSceneDelegate {
   var originalDelegate: UISceneDelegate?

   func windowScene(_ windowScene: UIWindowScene, userDidAcceptCloudKitShareWith cloudKitShareMetadata: CKShareMetadata) {

       // your code here
   }

   // forward all other UIWindowSceneDelegate/UISceneDelegate callbacks to original, like
   func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
       originalDelegate?.scene(scene, willConnectTo: session, options: connectionOptions)
   }
}

How to get appdelegate like thing in swiftUI

You can create a custom class that conforms to UIApplicationDelegate, and then use the @UIApplicationDelegateAdaptor to tell your SwiftUI app about it:

class MyAppDelegate: NSObject, UIApplicationDelegate {
  func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
    // your code here
  }
}

@main
struct MyApp: App {
    @UIApplicationDelegateAdaptor(MyAppDelegate.self) var appDelegate

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

Flow for setting up a social component in an app using 100% CloudKit and SwiftUI?

You don't have to use UICloudSharingController, no. You can set up your own CKShare object manually. It has a url property that is what a user needs to click on in order to gain access to the CKRecord you are sharing. So you can display the url in a custom way or pass it around however you like.

The CKShare docs show all the available properties:
https://developer.apple.com/documentation/cloudkit/ckshare

This article is a little old, but it helped me see the overall process of setting up a CKShare: https://kwylez.medium.com/cloudkit-sharing-series-creating-the-ckshare-40e420b94ee8

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