在AVCaptureSession运行时显示相机流 [英] Show camera stream while AVCaptureSession's running

问题描述

我可以根据使用AVCaptureSession从相机捕捉视频帧http://developer.apple.com/iphone/library/qa/qa2010/qa1702.html 。但是，似乎AVCaptureScreen从相机捕获帧而不在屏幕上显示相机流。我想像UIImagePicker一样显示相机流，以便用户知道相机正在打开并看到相机指向的位置。任何帮助或指针将不胜感激！

I was able to capture video frames from the camera using AVCaptureSession according to http://developer.apple.com/iphone/library/qa/qa2010/qa1702.html. However, it seems that AVCaptureScreen captures frames from the camera without showing the camera stream on the screen. I would like to also show camera stream just like in UIImagePicker so that the user knows that the camera is being turned on and sees what the camera is pointed at. Any help or pointer would be appreciated!

推荐答案

AVCaptureVideoPreviewLayer 正是您所需要的。

Apple用于演示如何使用它的代码片段是：

The code fragment Apple uses to demonstrate how to use it is:

AVCaptureSession *captureSession = <#Get a capture session#>;
AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession];
UIView *aView = <#The view in which to present the layer#>;
previewLayer.frame = aView.bounds; // Assume you want the preview layer to fill the view.
[aView.layer addSublayer:previewLayer];

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