iOS在label上加横杠

UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(20, 50, 200, 50)];
    [self.view addSubview:label];
    label.text = @"24.56";
    label.textAlignment = NSTextAlignmentCenter;
    label.textColor = [UIColor redColor];
    NSMutableAttributedString *attri = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"￥%@",label.text]];
    [attri addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(0, attri.length)];// 如果不加这个，横线的颜色跟随label字体颜色改变
    [attri addAttribute:NSStrikethroughColorAttributeName value:[UIColor grayColor] range:NSMakeRange(0, attri.length)];
    label.attributedText = attri;

显示效果如下：