ios 字体加斜和下划线

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, 300, 100)];
    label.backgroundColor = [UIColor redColor];
    label.numberOfLines = 3;
    NSMutableAttributedString *content = [[NSMutableAttributedString alloc]initWithString:[NSString stringWithFormat:@"您的待办业务条fasdfasdfosadfjasdkljfklasjklfjasdlkjfklasdjklfjalskdjflkadsj"]];
    NSRange contentRange = {0,[content length]};
    [content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];
    
    label.attributedText = content;
    [self.view addSubview:label];