आईओएस एनक्यू को अनदेखा कर रहा है नमूनाबफर क्योंकि स्थिति विफल हो गई है

यदि आपको इसी तरह की समस्या थी, तो आपको हर बार ऐप को अग्रभूमि में प्रवेश करने पर AVSampleBufferDisplayLayer सेट करने की आवश्यकता होती है। ऐशे ही:

//AppDelegate.swift
func applicationWillEnterForeground(_ application: UIApplication) {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.

    viewcontroller?.setLayer()
}


//ViewController.swift
func setLayer() {
    sessionHandler.layer = AVSampleBufferDisplayLayer()
    sessionHandler.layer.frame = preview.bounds
    sessionHandler.layer.videoGravity = AVLayerVideoGravityResizeAspectFill
    preview.layer.addSublayer(sessionHandler.layer)
}

और सबलेयर को हटाना न भूलें:

func applicationDidEnterBackground(_ application: UIApplication) {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

    viewcontroller?.sessionHandler.layer.removeFromSuperlayer()
}