iOS 富文本

NSMutableAttributedString *abs = [[NSMutableAttributedString alloc]initWithString:@"ABCDEFGHIGKLMN北京上海帝都魔都端午端午吃粽子"];
    [abs beginEditing];
    //字体大小
    [abs addAttribute:NSFontAttributeName
                value:[UIFont systemFontOfSize:20.0]
                range:NSMakeRange(0, 2)];
    //字体颜色
    [abs addAttribute:NSForegroundColorAttributeName
                value:[UIColor blueColor]
                range:NSMakeRange(2, 2)];
    //下划线
    [abs addAttribute:NSUnderlineStyleAttributeName
                value:@(NSUnderlineStyleSingle)
                range:NSMakeRange(3, 7)];

    //字体的设置
    [abs addAttribute:NSFontAttributeName
                value:[UIFont fontWithName:@"AppleGothic" size:24]
                range:NSMakeRange(2, 6)];
    //删除线
    [abs addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(10, 7)];
    //删除线的颜色依附于删除线
    [abs addAttribute:NSStrikethroughColorAttributeName value:[UIColor redColor] range:NSMakeRange(10, 7)];
    //_showLabel 是之前定义好的UILabel
    _showLabel.attributedText = abs;
    _showLabel.numberOfLines = 0;