How to set NSString's background cornerRadius on iOS7

Question

I want to set NSString\'s background cornerRadius on iOS7. But,NSString don\'t have layer...

Please tell me, how to set NSString\'s background cornerRadius on iOS7?<

Answer 1

As a complement to @Emmanuel's solution, adding

CGContextSetAllowsAntialiasing(ctx, YES);
CGContextSetShouldAntialias(ctx, YES);

will make it look much better.