给UIlabel设置不同字体 颜色 下划线

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 520, 100)];

    label.textColor = [UIColor grayColor];

    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"小明回复:终于可以回家了，太高兴了，哈哈哈哈哈哈。"];

    

    [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 blackColor]

                range:NSMakeRange(2,2)];

//下划线

[str addAttribute:(NSString *)kCTUnderlineStyleAttributeName

                           value:(id)[NSNumber numberWithInt:kCTUnderlineStyleSingle]

                           range:NSMakeRange(0, 4)];

    [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)];

    label.attributedText = str;