- [UILabel resizeToFit:]

gistfile1.m

/**
 * Resizes a UILabel to be exactly the size it needs to be to fit it's contents
 * within the constraints of CGSize.
 *
 * @param maxSize The maximum allowable size the label may fit in
 */
- (void)resizeToFit:(CGSize)maxSize {
    CGSize expectedLabelSize = [[self text] sizeWithFont:[self font]
                                       constrainedToSize:maxSize
                                           lineBreakMode:[self lineBreakMode]];
    CGRect newFrame = [self frame];
    newFrame.size = expectedLabelSize;
    [self setFrame:newFrame];
}