我正在尝试模仿从前置摄像头到后置摄像头的相机应用程序过渡。它使用 UIViewAnimationOptionTransitionFlipFromLeft ..
我目前的方法是用前置摄像头拍照,切换到后置摄像头,用后置摄像头拍照,将它们加载到两个UIImageView中并使用图像视图进行过渡..(隐藏当前的相机流在过程中)..
问题是当我调用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,这里有一些我省略的代码,如果你认为它会帮助让我知道,我会发布其余的。
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];
}