如何在ios开发中,使用相机时切换摄像头
//先声明两个属性,遵循两个协议(协议可能非必要,视具体开发而定)
// <AVCaptureVideoDataOutputSampleBufferDelegate,AVCaptureAudioDataOutputSampleBufferDelegate>
// @property (nonatomic, strong) AVCaptureSession *captureSession;
// @property (nonatomic, strong) AVCaptureDeviceInput *currentVideoDeviceInput;
// 1.获取当前设备方向
AVCaptureDevicePosition curPosition = _currentVideoDeviceInput.device.position;
// 2.获取需要改变的方向
AVCaptureDevicePosition togglePosition = curPosition == AVCaptureDevicePositionFront?AVCaptureDevicePositionBack:AVCaptureDevicePositionFront;
// 3.获取改变的摄像头设备
AVCaptureDevice *toggleDevice = [self getVideoDevice:togglePosition];
// 4.获取改变的摄像头输入设备
AVCaptureDeviceInput *toggleDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:toggleDevice error:nil];
// 5.移除之前摄像头输入设备
[_captureSession removeInput:_currentVideoDeviceInput];
// 6.添加新的摄像头输入设备
[_captureSession addInput:toggleDeviceInput];
// 7.记录当前摄像头输入设备
_currentVideoDeviceInput = toggleDeviceInput;
