Crop UIImage

Crop UIImage

- (UIImage *)imageByCroppingImage:(UIImage *)image toSize:(CGSize)size
{
    // not equivalent to image.size (which depends on the imageOrientation)!
    double refWidth = CGImageGetWidth(image.CGImage);
    double refHeight = CGImageGetHeight(image.CGImage);
    
    double x = (refWidth - size.width) / 2.0;
    double y = (refHeight - size.height) / 2.0;
    
    CGRect cropRect = CGRectMake(x, y, size.height, size.width);
    CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], cropRect);
    
    UIImage *cropped = [UIImage imageWithCGImage:imageRef scale:0.0 orientation:image.imageOrientation];
    CGImageRelease(imageRef);
    
    return cropped;
}