//改变相应字符串的颜色

• (void)ChangeTextColorByLabel:(UILabel *)label
  font:(CGFloat)font
  model:(NSString *)text{
  //label 需要操作的Label
  //font 该字符的字号
  NSMutableAttributedString *noteString = [[NSMutableAttributedString alloc] initWithString:label.text];
  NSRange stringRange = NSMakeRange(3, text.length);
  //该字符串的位置
  [noteString addAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:font], NSForegroundColorAttributeName:[UIColor blackColor]} range:stringRange];
  [label setAttributedText: noteString];
  }
  //button

• (void)rcs_changButtonTitleColorAndFontWithText:(NSString *)titleText
  button:(UIButton *)button{

  NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@",titleText]];
  [str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial-BoldItalicMT" size:18.0] range:NSMakeRange(0,1)];
  [str addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(0,1)];
  //
  [button setAttributedTitle:str forState:UIControlStateNormal];
  }