UIImage with transparent rounded corners

Question

I\'m using following code to add rounded corners to my UIImage, but the problem is that the rounded corners are showing \"white\" area instead of transparent or \"clear\". W

Answer 1

Here's a simpler formulation using UIKit calls:

- (UIImage*) roundCorneredImage: (UIImage*) orig radius:(CGFloat) r {
    UIGraphicsBeginImageContextWithOptions(orig.size, NO, 0);
    [[UIBezierPath bezierPathWithRoundedRect:(CGRect){CGPointZero, orig.size} 
                                cornerRadius:r] addClip];
    [orig drawInRect:(CGRect){CGPointZero, orig.size}];
    UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return result;
}

Notice the NO parameter - this makes the image context transparent, so the clipped-out region is transparent.