UILabel 多颜色、字体

NSMutableAttributedString  *str = [[ NSMutableAttributedString  alloc] initWithString:@ "Using NSAttributed String" ];
[str addAttribute: NSForegroundColorAttributeName  value:[UIColor blueColor] range: NSMakeRange (0,5)];
[str addAttribute: NSForegroundColorAttributeName  value:[UIColor redColor] range: NSMakeRange (6,12)];
[str addAttribute: NSForegroundColorAttributeName  value:[UIColor greenColor] range: NSMakeRange (19,6)];
[str addAttribute: NSFontAttributeName  value:[UIFont fontWithName:@ "Arial-BoldItalicMT"  size:30.0] range: NSMakeRange (0, 5)];
[str addAttribute: NSFontAttributeName  value:[UIFont fontWithName:@ "HelveticaNeue-Bold"  size:30.0] range: NSMakeRange (6, 12)];
[str addAttribute: NSFontAttributeName  value:[UIFont fontWithName:@ "Courier-BoldOblique"  size:30.0] range: NSMakeRange (19, 6)];
attrLabel.attributedText = str;