UILabel 改变部分字体颜色和大小

  //富文本改变部分字体颜色
   NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:str];
   [attribute addAttributes:@{NSForegroundColorAttributeName:goodsPriceColor} range:NSMakeRange(3,str.length-3)];
   [attribute addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:NSMakeRange(3,str.length-3)];
   jifenLab.attributedText = attribute;