- (UIImage*)getSubImage:(CGRect)rect
{
CGImageRef subImageRef = CGImageCreateWithImageInRect(self.CGImage, rect);
CGRect smallBounds = CGRectMake(0, 0, CGImageGetWidth(subImageRef), CGImageGetHeight(subImageRef));
UIGraphicsBeginImageContext(smallBounds.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawImage(context, smallBounds, [self flip:subImageRef]);
UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];
UIGraphicsEndImageContext();
return smallImage;
}
- (CGImageRef )flip:(CGImageRef)image{
CGSize size = CGSizeMake(CGImageGetWidth(image), CGImageGetHeight(image));
UIGraphicsBeginImageContextWithOptions(size, NO, 0);
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, size.width, size.height), image);
CGImageRef result = [UIGraphicsGetImageFromCurrentImageContext() CGImage];
UIGraphicsEndImageContext();
return result;
}
