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];
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