AVCaptureConnection——setVideoOrientation参数(效果图):
AVCaptureVideoOrientationPortrait

AVCaptureVideoOrientationPortraitUpsideDown

AVCaptureVideoOrientationLandscapeRight

AVCaptureVideoOrientationLandscapeLeft

AVCaptureConnection——setVideoOrientation参数(效果图):
AVCaptureVideoOrientationPortrait
AVCaptureVideoOrientationPortraitUpsideDown
AVCaptureVideoOrientationLandscapeRight
AVCaptureVideoOrientationLandscapeLeft