开发中，使用iconfont第三方字体，设置navigationItem

     let button:UIBarButtonItem = UIBarButtonItem.init(title: "\u{0000e619}", style: .done, target: self, action: #selector(chackCustomInfo(_:)))

      button.setTitleTextAttributes([NSFontAttributeName:(UIFont.init(name: "iconfont", size: 24))!], for: UIControlState())