的iOS相机应用程序，闪烁时，相机背面

Question

我试图从正面模仿相机的应用过渡到后置摄像头。它采用了UIViewAnimationOptionTransitionFlipFromLeft ..

我目前的方法是在拍摄照片使用前置摄像头，切换到后置摄像头，使用后置摄像头拍摄图片，将它们加载到两个UIImageView中，并执行图像视图的转换..（隐藏当前摄像机流程）。

问题是当我打电话从前置摄像头切换到后置摄像头时，cameraView（AVCapturePreviewLayer）会立即切换视图，然后我可以隐藏它（这发生在flipCamera中ToFront在最后一行.. [_captureSession commitConfiguration]）...

希望这是有道理的，继承人一些代码我省略了一些，如果你认为它会帮助让我知道，我会张贴其余的它。
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]; 
     [self finishCameraFlip]; 
    } 
} 
- (void)finishCameraFlip{ 
    UIImageView *secondImageView = [[UIImageView alloc] initWithImage:_secondImageForFlip]; 
    [secondImageView setFrame:_capturePreviewView.bounds]; 

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

    [UIView transitionWithView:_capturePreviewView duration:3.3f 
options:UIViewAnimationOptionTransitionFlipFromLeft animations: 
    ^{ 
     [_firstImageViewForFlip removeFromSuperview]; 
     [_capturePreviewLayer setFrame:_capturePreviewView.bounds]; 
     [_capturePreviewView addSubview:secondImageView]; 

    } completion: 
    ^(BOOL finished){ 
     [secondImageView removeFromSuperview]; 
    }]; 

    isUsingFrontInput = isUsingFrontInput ? NO : YES; 

    _firstImageForFlip = nil; 
    _secondImageForFlip = nil; 
    } 

类：RecordVideoHandler

//iVars for this class..  
    AVCaptureSession *_captureSession; 

    - (void)flipCameraToFront 
    { 
    [_captureSession beginConfiguration]; 
    for (AVCaptureInput *input in _captureSession.inputs) { 
     if (input == _captureRearInput) { 
      [_captureSession removeInput:_captureRearInput]; 
      [_captureSession addInput:_captureFrontInput]; 
     } 
    } 
    _currentCaptureDevice = _captureDeviceFrontFacing; 
    [_captureSession commitConfiguration]; 
} 

Answer 1

如果有人想知道，我想它了。我必须使用performSelectors来等待下一个运行循环，因为相机立即翻转，而视图的东西在运行循环之后等待......不确定具体情况，继承代码。

- (void)doCameraFlip:(UIButton *)sender 
{ 
    NSLog(@"doCameraFlip"); 
    [_recordHandler addStillImageOutput];  
    [_recordHandler captureAndReturnStillImage];  
} 
- (void)imageReturned:(UIImage *)inImage{ 
    [_recordHandler removeStillImageOutput];    
    _imageViewForFlip= [[UIImageView alloc] initWithImage:inImage]; 
    [_imageViewForFlip setFrame:_containerView.bounds]; 
    [_containerView addSubview:_imageViewForFlip]; 


    [self performSelector:@selector(cfe) withObject:nil afterDelay:0.0f]; 
    [self performSelector:@selector(cfe2) withObject:nil afterDelay:0.0f]; 

} 
- (void)cfe{ 
    if(isUsingFrontInput){ 
     [_recordHandler flipCameraToBack]; 
    }else{ 
     [_recordHandler flipCameraToFront]; 
    } 

} 
- (void)cfe2{ 
    [UIView transitionWithView:_containerView duration:3.0f options:UIViewAnimationOptionTransitionFlipFromRight animations:^{ 
     [_imageViewForFlip removeFromSuperview]; 
     [_containerView addSubview:_capturePreviewView]; 
    } completion:nil]; 
}