How to detect when RPSystemBroadcastPickerView is dismissed?

Question

In the app, I am using a RPSystemBroadcastPickerView to start a system-wide screen recording. I need to react to the user starting screen record or dismissing the shown picker view. In both cases, the system view gets dismissed.

I assumed that dismissing the system picker view will trigger a viewDidAppear event on the currently shown view controller. This does not happen. I tried to test if the AppDelegate triggers applicationDidBecomeActive or applicationWillEnterForeground - again without success (this are triggered when user open control center).

Does anyone have a suggestion what else to try?

Answer 1

Before iOS 13: hook RPSystemBroadcastPickerView containerVC

iOS 14.0 or later: Monitor the focus and out-focus events of the app

Answer 2

You can achieve it indirectly using Timer and UserDefaults.

Start the Timer in ViewController from the main app and check for corresponding value change from Broadcast Extension.

 class SampleHandler: RPBroadcastSampleHandler {

    override func broadcastStarted(withSetupInfo setupInfo: [String : NSObject]?) {
       appGroupDefaults.set(true, forKey: appGroupUserDefaultKeys.isScreenBroadcastStarted.rawValue)
    }

    override func broadcastFinished() {
       appGroupDefaults.set(true, forKey: appGroupUserDefaultKeys.isScreenBroadcastStopped.rawValue)
    }
    
 }