不能将值类型'TableViewController.Type'转换为期望的参数类型'UIViewController'

问题描述：

我正在注册并登录应用程序。我为此使用了Parse。如果登录/注册成功，我想将View Controller移动到TableViewController。但是我收到此错误：“无法转换值type'TableViewController.Type”预期参数类型‘的UIViewController’不能将值类型'TableViewController.Type'转换为期望的参数类型'UIViewController'

这里是我得到的错误在该行：

func logInViewController(logInController: PFLogInViewController, didLogInUser user: PFUser) { 
    self.dismissViewControllerAnimated(true, completion: nil) 
    self.presentViewController(TimelineTableViewController, animated: true, completion: nil) 


}

这里是整个代码：

// Created by Ojas Sethi on 12/10/15. 
// Copyright © 2015 Jell Apps. All rights reserved. 
// 

import UIKit 
import Parse 
import ParseUI 

class LoginSignupViewController: UIViewController, PFLogInViewControllerDelegate, PFSignUpViewControllerDelegate { 
    var logInViewController: PFLogInViewController = PFLogInViewController() 
    var signUpViewController: PFSignUpViewController = PFSignUpViewController() 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view. 
    } 

    override func viewDidAppear(animated: Bool) { 
     super.viewDidAppear(animated) 

     if (PFUser.currentUser() == nil){ 
      self.logInViewController.fields = PFLogInFields.UsernameAndPassword 
      self.logInViewController.fields = PFLogInFields.LogInButton 
      self.logInViewController.fields = PFLogInFields.SignUpButton 
      self.logInViewController.fields = PFLogInFields.PasswordForgotten 
      self.logInViewController.fields = PFLogInFields.DismissButton 

      /*| PFLogInFields.LogInButton | PFLogInFields.SignUpButton | PFLogInFields.PasswordForgotten | PFLogInFields.DismissButton*/ 

      let logoInLogoTitle = UILabel() 
      logoInLogoTitle.text = "Ziffer" 
      logoInLogoTitle.font = UIFont.systemFontOfSize(25) 

self.logInViewController.logInView?.logo = logoInLogoTitle 
      self.logInViewController.delegate = self 

      let signUpLogoTitle = UILabel() 
      signUpLogoTitle.text = "Ziffer" 
      logoInLogoTitle.font = UIFont.systemFontOfSize(25) 

      self.signUpViewController.signUpView?.logo = signUpLogoTitle 
      self.signUpViewController.delegate = self 
      self.logInViewController.signUpController = self.signUpViewController 
     } 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 
    func logInViewController(logInController: PFLogInViewController, shouldBeginLogInWithUsername username: String, password: String) -> Bool { 
     if (!username.isEmpty || !password.isEmpty){ 
      return true 
     }else{ 
      return false 
     } 
    } 

    func logInViewController(logInController: PFLogInViewController, didLogInUser user: PFUser) { 
     self.dismissViewControllerAnimated(true, completion: nil) 
     self.presentViewController(TimelineTableViewController, animated: true, completion: nil) 
    } 

    func logInViewController(logInController: PFLogInViewController, didFailToLogInWithError error: NSError?) { 
     print("failed to login") 
    } 

    func signUpViewController(signUpController: PFSignUpViewController, didSignUpUser user: PFUser) { 
     self.dismissViewControllerAnimated(true, completion: nil) 
     self.presentViewController(logInViewController, animated: true, completion: nil) 
     SignUpSuccessfulAlert() 

    } 

    func signUpViewController(signUpController: PFSignUpViewController, didFailToSignUpWithError error: NSError?) { 
     print("Failed to signup...") 

     SignUpFaliedAlert() 
    } 

    func signUpViewControllerDidCancelSignUp(signUpController: PFSignUpViewController) { 
     print("User dismissed sign up.") 
    } 

    func SignUpSuccessfulAlert(){ 
     var alertController : UIAlertController 
    alertController = UIAlertController(title: "Sign Up Successful", message: "Yay! Sign up was successful! Now you can start using Ziffer!", preferredStyle: .Alert) 

     let doneAction = UIAlertAction(title: "Ok", style: .Default, handler: nil) 

     alertController.addAction(doneAction) 

     self.presentViewController(alertController, animated: true, completion: nil) 
    } 

    func SignUpFaliedAlert(){ 
     var signUpalertFail : UIAlertController 

     signUpalertFail = UIAlertController(title: "Failed", message: "Sorry! Sign up faield. Check the connections and try again later", preferredStyle: .Alert) 

     let okAction = UIAlertAction(title: "Ok", style: .Default, handler: nil) 

     signUpalertFail.addAction(okAction) 

     self.presentViewController(signUpalertFail, animated: true, completion: nil) 
    } 
}

答

你（大写）TimelineTableViewController似乎是一个类，而不是一个类的实例，您需要首先创建该控制器的一个实例

012。

推荐的方法是在故事板中为此控制器创建一个segue，然后在想要呈现控制器时调用performSegueWithIdentifier。

与代码最接近的地方是在instantiateViewControllerWithIdentifier的代码中实例化视图控制器的代码（同样来自故事板），但上面的方法代码少，功能相同，因此是首选。

非常感谢你帮助我！ – ojassethi

嗯...... Mundi，当我实例化视图控制器时，它只是给了我一部分TableViewController。它不会给我像按钮，文本域等UI元素 – ojassethi

答

首先，您正试图从登录视图控制器中呈现您即将关闭的新视图控制器。那是不对的。你会想要从提供登录视图控制器的稳定视图控制器中呈现它。这里是关于如何做到这一点的nice example。这是基于objective-c的，因此要耐心。

其次，您需要创建一个对象TimelineTableViewController以呈现在视图层次结构中（再次查看我在上面共享的链接）。像这样的东西：

let timeLineTableVC = TimelineTableViewController() 
self.presentViewController(timeLineTableVC, animated: true, completion: nil)

不能将值类型'TableViewController.Type'转换为期望的参数类型'UIViewController'

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