Using cornerRadius on a UIImageView in a UITableViewCell

Question

I\'m using a UIImageView for each of my UITableViewCells, as thumbnails. My code uses SDWebImage to asynchronously grab those images from

Answer 1

Non blocking solution

As a follow up to Andrea's response, here is a function that will run his code in the background.

+ (void)roundedImage:(UIImage *)image
          completion:(void (^)(UIImage *image))completion {
    dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        // Begin a new image that will be the new image with the rounded corners
        // (here with the size of an UIImageView)
        UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
        CGRect rect = CGRectMake(0, 0, image.size.width,image.size.height);

        // Add a clip before drawing anything, in the shape of an rounded rect
        [[UIBezierPath bezierPathWithRoundedRect:rect
                                    cornerRadius:image.size.width/2] addClip];
        // Draw your image
        [image drawInRect:rect];

        // Get the image, here setting the UIImageView image
        UIImage *roundedImage = UIGraphicsGetImageFromCurrentImageContext();

        // Lets forget about that we were drawing
        UIGraphicsEndImageContext();
        dispatch_async( dispatch_get_main_queue(), ^{
            if (completion) {
                completion(roundedImage);
            }
        });
    });
}