uialertcontroller和用户协议

Question

我正在尝试展示一个显示我的服务条款的UIAlertController。我不能简单地将服务条款粘贴到消息体中，这是实现这一目标的最佳方法。我也只是在应用程序首次启动时调用它一次。

  func agree(){

    let alert = UIAlertController(title: "Terms of Service", message:"", preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "Agree", style: .default, handler: { (action: UIAlertAction) in
        print("OK")
    }))
    self.present(alert, animated: true, completion: nil)

}


     override func viewDidLoad() {

    super.viewDidLoad()

    if UserDefaults.standard.bool(forKey: "Walkthrough") {
        print("already shown")
        // Terms have been accepted, proceed as normal
    } else {


        agree()
        UserDefaults.standard.set(true, forKey: "Walkthrough")
    }

}