为UILabel设置NSStrikethroughStyleAttributeName在iOS 10.3中不起作用

Question

这是示例代码：

NSMutableAttributedString * str=[[NSMutableAttributedString   alloc]initWithString:@"$198"];   

[str addAttribute:NSStrikethroughStyleAttributeName value:@2 range:NSMakeRange(0,[str length])];  

yourLabel.attributedText = str;