AVCaptureSessionNotification

最新推荐文章于 2019-10-23 22:31:10 发布

原创最新推荐文章于 2019-10-23 22:31:10 发布 · 1.4k 阅读

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#Capture #Session #Notificati

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本文详细记录了AVCaptureSession从启动到运行过程中的一系列状态变更，包括开始运行、受到电话打断、应用进入后台导致的停止、打断结束后的自动重启等关键节点。通过观察这些状态变化，有助于理解iOS应用中摄像头捕获流程。

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1.session开始运行

-[RTAVVideoCaputre sessionDidStartRunning:] 
notif = NSConcreteNotification 0x1740536b0 
{name = AVCaptureSessionDidStartRunningNotification; object = <AVCaptureSession: 0x1700142f0 [AVCaptureSessionPreset1280x720]>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureStillImageOutput: 0x17402e380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoDataOutput: 0x17002d380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoPreviewLayer: 0x17402e420>}

2.电话打进来，收到打断通知

-[RTAVVideoCaputre captureSessionWasInterrupt:] [Line 39] notif = NSConcreteNotification 0x170053e60 {name = AVCaptureSessionWasInterruptedNotification; object = <AVCaptureSession: 0x1700142f0 [AVCaptureSessionPreset1280x720]>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureStillImageOutput: 0x17402e380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoDataOutput: 0x17002d380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoPreviewLayer: 0x17402e420>; userInfo = {
    AVCaptureSessionInterruptionReasonKey = 1;
}}

3.app进入后台，session停止通知

-[RTAVVideoCaputre sessionDidStopRunning:] [Line 47] notif = NSConcreteNotification 0x170053e60 {name = AVCaptureSessionDidStopRunningNotification; object = <AVCaptureSession: 0x1700142f0 [AVCaptureSessionPreset1280x720]>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureStillImageOutput: 0x17402e380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoDataOutput: 0x17002d380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoPreviewLayer: 0x17402e420>}

4.电话结束，收到打断结束通知

-[RTAVVideoCaputre sessionInterruptionEnded:] [Line 43] notif = NSConcreteNotification 0x170052f60 {name = AVCaptureSessionInterruptionEndedNotification; object = <AVCaptureSession: 0x1700142f0 [AVCaptureSessionPreset1280x720]>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureStillImageOutput: 0x17402e380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoDataOutput: 0x17002d380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoPreviewLayer: 0x17402e420>}

5.打断结束后，默认session自动restart通知

-[RTAVVideoCaputre sessionDidStartRunning:] [Line 51] notif = NSConcreteNotification 0x170052f60 {name = AVCaptureSessionDidStartRunningNotification; object = <AVCaptureSession: 0x1700142f0 [AVCaptureSessionPreset1280x720]>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureStillImageOutput: 0x17402e380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoDataOutput: 0x17002d380>
    <AVCaptureDeviceInput: 0x17002d320 [Back Camera]> -> <AVCaptureVideoPreviewLayer: 0x17402e420>}

用系统提供的通知

这样object应该传 session实例，传nil 好像也可用，但是穿个其他的通知收不到，还是没有发出来？？

//session 已经运转
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(sessionDidStartRunning:) name:AVCaptureSessionDidStartRunningNotification object:@{@"name":@"小明",@"心别":@"man"}];