SceneDelegate.md

How to Support SceneDelegate

Apple introduced SceneDelegate in iOS 13. This class can respond to state transitions of a Scene or an app's UI, e.g. entering foreground or background. See Apple's documentation for setting up the environment to launch from Scenes. Please note: setting up Camera Kit from AppDelegate when launching from scenes can lead to unexpected behavior, such as camera failing to appear.

The Camera Kit iOS sample apps do not currently demonstrate how this can be achieved. We intend to update them in a future release. In the meantime, here is some documentation to help you achieve that.

If your app has a SceneDelegate then do your set up there (rather than the AppDelegate) by adding the following code:

import UIKit
import SCSDKCameraKit
import SCSDKCameraKitReferenceUI

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    private enum Constants {
        static let partnerGroupId = "REPLACE-THIS-WITH-YOUR-OWN-APP-SPECIFIC-VALUE"
    }
    
    var window: UIWindow?
    let cameraController = CameraController()


    func scene(
        _ scene: UIScene,
        willConnectTo session: UISceneSession,
        options connectionOptions: UIScene.ConnectionOptions
    ) {
        guard let scene = (scene as? UIWindowScene) else { return }
        window = UIWindow(frame: UIScreen.main.bounds)
        
        cameraController.groupIDs = [SCCameraKitLensRepositoryBundledGroup, Constants.partnerGroupId]
        
        let cameraViewController = CameraViewController(cameraController: cameraController)
      
        window?.rootViewController = cameraViewController
        window?.windowScene = scene
        window?.makeKeyAndVisible()
    }
}

If you would like to support Scenes on iOS 13+, this is all you need to do.

Remember, however, that iOS 12 does not support Scenes. What if you would like your app to deploy a SceneDelegate but also support iOS 12? In that case, you can setup Camera Kit conditionally: do Camera Kit setup in SceneDelegate for iOS 13+ and in AppDelegate for iOS 12.

import UIKit
import SCSDKCameraKit
import SCSDKCameraKitReferenceUI

extension UIApplication {
    var supportsScenes: Bool {
        if #available(iOS 13, *),
           Bundle.main.object(forInfoDictionaryKey: "UIApplicationSceneManifest") != nil {
            return true
        }
        return false
    }
}

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    private enum Constants {
        static let partnerGroupId = "REPLACE-THIS-WITH-YOUR-OWN-APP-SPECIFIC-VALUE"
    }

    var window: UIWindow?
    let cameraController = CameraController()

    func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        if application.supportsScenes {
            // Do nothing here because Camera Kit setup happens in SceneDelegate
            return true
        }
        window = UIWindow(frame: UIScreen.main.bounds)
        
        cameraController.groupIDs = [SCCameraKitLensRepositoryBundledGroup, Constants.partnerGroupId]
        
        let cameraViewController = CustomizedCameraViewController(cameraController: cameraController)

        window?.rootViewController = cameraViewController
        window?.makeKeyAndVisible()

        return true
    }
}