Ios AVCaptureSession DidFinishRedingToOutputFileATURL：发生中断（如控制中心）时不调用

我花了很多时间在这上面，所以我想我应该重新发布

我正在使用带有AVCaptureMovieFileOutput的AVCaptureSession，允许用户在提供暂停录制按钮的同时录制视频

在应用程序后台启动、控制中心解除或出现报警/呼叫等中断之前，此功能非常有效。根据设备硬件的不同，我们会看到不同类型的错误

• 在较旧的设备上，即使我们重新初始化captureSession，捕获会话也将无法在此类事件之后开始录制
• 在较新的设备上，现有的视频（如果存在的话）是可以的，但是任何后续恢复录制的尝试都将彻底失败，或者无法录制音频

在第一种情况下，DidStartRecordingToOutputFileAttribute:将永远不会被调用。在第二种情况下，将调用didStartRecordingToOutputFileAtURL:但不会调用didFinishRecordingToOutputFileAtURL:

目前，我们正在这样做：

- (void)viewDidLoad {
   [self initializeCaptureSessionAndOutputData]; //based on your requirements
}

- (void)viewWillAppear:(BOOL)animated {
   [super viewWillAppear:animated];
   [self.captureSession startRunning];
   [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(interruptionDidOccur)
                                               name:UIApplicationWillResignActiveNotification
                                           object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
   [super viewWillDisappear:animated];
   [self.captureSession stopRunning];
   [[NSNotificationCenter] defaultCenter] removeObserver:self];
}

- (void)interruptionDidOccur {
   [self.movieFileOutput stopRecording]; //expect didFinishRecordingToOutputFileAtURL to be called
}

---

这个问题没有记录在案，但可以解决。除了打电话

[self.captureSession停止运行]

在ViewWillEnglish中：每当UIApplicationWillResignActiveNotification通知也被激发时，必须调用它。以下是示例代码：

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self handleAppReturn];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(becameActive)
                                             name:UIApplicationDidBecomeActiveNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(resignActive)
                                             name:UIApplicationWillResignActiveNotification
                                           object:nil];
}

- (void)resignActive {
    [self.videoCameraManager.captureSession stopRunning];
    if (!self.isPaused) {
       [self pauseVideo];
    }
}

- (void)becameActive {
    [self.videoCameraManager.captureSession startRunning];
}