用下面的代码剪裁图片:
- (UIImage*)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect
{
CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
// or use the UIImage wherever you like
UIImage * img = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return img;
}
在模拟器中运行的好好的,但是到了设备上就出问题了。