Proper use of UIRectClip to scale a UIImage down to icon size

Question

Given a UIImage of any dimension, I wish to generate a square \"icon\" sized version, px pixels to a side, without any distortion (stretching). How

Answer 1

Eureka! I had things a little mixed up. This works:

CGRect clipRect = CGRectMake(-offset.x, -offset.y,
                             (ratio * size.width) + delta,
                             (ratio * size.height) + delta);
UIGraphicsBeginImageContext(CGSizeMake(px, px));
UIRectClip(clipRect);
[myImage drawInRect:clipRect];
UIImage *icon = UIGraphicsGetImageFromCurrentImageContext();

// Do something with the icon here ...

UIGraphicsEndImageContext();

No more need for rect. The trick appears to be using a negative offset in the clipping rectangle, thereby lining up the origin of where we want to grab our 50 x 50 image (in this example).

Perhaps there's an easier way. If so, please weigh in!