Question

我有一个cameraOverlay，它有自己的相机按钮，当我们按下相机按钮并使用委托方法时我使用takePicture方法

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *)info{
    [CommonClass AddToStack:@"ReviewController:imagePickerController"];
    PhotoOverlay *overlay = (PhotoOverlay*)picker.cameraOverlayView;
    [overlay setupImage:[info objectForKey:UIImagePickerControllerOriginalImage]];
}

setupImage:方法只是设置我在叠加层上的UIImageView的图像

这个问题是takePicture和imagepicker委托方法之间有0.3秒的间隙，所以它看起来很奇怪。在使用自定义叠加层时，我已经看到应用程序立即从按相机切换到最终视图。

有人遇到过这个吗？

Answer 1

获取即时图像的方法是首先使用屏幕截图并使用该图像，然后调用takePicture并在屏幕截图准备就绪时替换屏幕截图（屏幕截图的分辨率低于实际图片）。

这是我的代码：

-(void)CameraPressedTake
{
extern CGImageRef UIGetScreenImage();
PhotoOverlay *overlay = (PhotoOverlay*)cameraPicker.cameraOverlayView;

CGImageRef cgoriginal = UIGetScreenImage();

float width = 320.0;
float height = 480.0-[overlay myHeight];
//if it's retina...
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 2) {
    width = 2*width;
    height = 2*height;
}
CGImageRef cgimg = CGImageCreateWithImageInRect(cgoriginal, CGRectMake(0, 0, width, height));            
UIImage *viewImage = [UIImage imageWithCGImage:cgimg];
[overlay setupImage:viewImage];
CGImageRelease(cgoriginal);                
CGImageRelease(cgimg);
[cameraPicker takePicture];
}

在UIImagepickercontroller之后立即获取UIImage - （void）takePicture

1 个答案: