修改一句话里面的某几个字体颜色

  NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc]initWithString:self.bottomTip.text];

   NSRange telNum =NSMakeRange(10,11);

    [attributedStringaddAttribute:NSForegroundColorAttributeName value:WJAppTextDeepGrayColorrange:telNum];

    [self.bottomTipsetAttributedText:attributedString];