lable文字上面 加横线

NSUInteger length = [label.text length];
  
NSMutableAttributedString *attri = [[NSMutableAttributedString alloc] initWithString:label.text];
   

从第几位开始 到 第几位结束 
[attri addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(3, length-3)];

[label setAttributedText:attri];