小编ber*_*cal的帖子

我正在尝试模仿相机应用程序从前到后相机的过渡..它使用UIViewAnimationOptionTransitionFlipFromLeft ..

我目前的方法是使用前置摄像头拍摄照片,切换到后置摄像头,使用后置摄像头拍摄照片,将其加载到两个UIImageViews中并使用图像视图执行转换..(在此过程中隐藏当前的摄像头流)..

问题是,当我从前置摄像头切换到后置摄像头时,cameraView(一个AVCapturePreviewLayer)会在我隐藏它之前立即切换视图(这发生在最后一行的flipCameraToFront中.. [_captureSession commitConfiguration])...

希望这是有道理的,继承人的一些代码我省略了一些,如果你认为它会帮助我知道,我会发布其余部分.
任何帮助将不胜感激,谢谢

//class:RecordViewController
//iVars for this class..   
RecordVideoHandler *_recordHandler;
UIImage *_firstImageForFlip;
UIImage *_secondImageForFlip;
UIImageView *_firstImageViewForFlip;
BOOL isUsingFrontInput;
AVCaptureVideoPreviewLayer *_capturePreviewLayer;
UIView *_capturePreviewView;

- (void)doCameraFlip:(UIButton *)sender
{
    [_recordHandler addStillImageOutput];
    //This method calls imageReturned:(UIImage *)inImage;
    [_recordHandler captureAndReturnStillImage];


}   
- (void)imageReturned:(UIImage *)inImage{

    if(_firstImageForFlip == nil){
        [_capturePreviewLayer setFrame:CGRectZero];
        _firstImageForFlip = inImage;
        _firstImageViewForFlip = [[UIImageView alloc] initWithImage:_firstImageForFlip];


        if(isUsingFrontInput)
            [_firstImageViewForFlip setTransform:CGAffineTransformMakeScale(-1.0, 1.0)];


        [_firstImageViewForFlip setFrame:_capturePreviewView.bounds];
        [_capturePreviewView addSubview:_firstImageViewForFlip];


        if(isUsingFrontInput){
            [_recordHandler flipCameraToBack];
        }else{
            [_recordHandler flipCameraToFront];
        }
        [_recordHandler captureAndReturnStillImage];
    }else{
        _secondImageForFlip = inImage;
        [_recordHandler removeStillImageOutput]; …