Question

我单击了登录按钮，并在通知中心中引发了消息，并打开了一个国家选择器，当我在国家选择器中单击登录按钮时，视图视图必须打开，但会引发错误：

0x0的内存读取失败........

此错误发生在获取控制器对象和当前对象之间。我现在该怎么办？

我正在使用Xcode 10.1和Swift 4

@objc func showSpinningWheel(_ notification: NSNotification) {
    if whichbuttonclick == true
    {

        let vc = self.storyboard?.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController

        self.present(vc, animated: true, completion: nil)

    }
    else
    {
      self.performSegue(withIdentifier: "Register", sender: self)
    }
}

我希望它会跳过登录控制器，但会引发错误。

Answer 1

This is how i add Notification Observer :
NotificationCenter.default.addObserver(self, selector: #selector(self.showSpinningWheel(:)), name: Notification.Name(rawValue: "opencontrollermessagenotification"), object: nil) 

@objc func showSpinningWheel( notification: NSNotification)
 {
  if whichbuttonclick == true
 { self.performSegue(withIdentifier: "Login", sender: self) } 
else
 { self.performSegue(withIdentifier: "Register", sender: self) }
 } 

and This is how i Post it :
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "opencontrollermessagenotification"), object: nil, userInfo: nil)

如何解决错误：0x0的内存读取失败

1 个答案: