iOS AVCapture前置摄像头不显示镜像翻转

iOS系统下前置摄像头拍照/录像默认是会沿中间镜像翻转的, 项目用到AVCaptureSession拍照/录像, 需求要使用前置摄像头时不要左右镜像效果, 研究了好久, 谷歌到的都是旋转的, 看到UIImagePicker可以使用transform进行翻转, 于是又找transform和layer也是无果, 最终想到可能会有一个bool值能够设定这个镜像, 于是查阅API发现一个videoMirrored方法,
判断为前置摄像头然后将该属性设定为YES, 大功告成!

//负责从AVCaptureDevice获得输入数据
@property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;

//根据设备输出获得连接
AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];

// 前置摄像头翻转
AVCaptureDevicePosition currentPosition=[[self.captureDeviceInput device] position];
if (currentPosition == AVCaptureDevicePositionUnspecified || currentPosition == AVCaptureDevicePositionFront) {
connection.videoMirrored = YES;
} else {
connection.videoMirrored = NO;
}