iOS给label加入下划线

    UILabel *myLabel = [[UILabelalloc] initWithFrame:CGRectMake(100,100, 320, 40)];

    NSMutableAttributedString *content = [[NSMutableAttributedStringalloc] initWithString:@"initWithFrame"];

   NSRange contentRange = {0, [contentlength]};

    [content addAttribute:NSUnderlineStyleAttributeNamevalue:[NSNumbernumberWithInteger:NSUnderlineStyleSingle]range:contentRange];

    

    myLabel.attributedText = content;

    [self.viewaddSubview:myLabel];

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