快速打开新的UIViewController

Question

我试图打开新的UIViewController当我点击UICollectionView里面的一个项目，但是使用这个代码我的应用程序崩溃，Xcode和模拟器重新启动，所以我什至不能看到问题出在哪里。

import UIKit 

class ViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout { 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     collectionView?.register(CustomCell.self, forCellWithReuseIdentifier: "cellId") 
    } 

    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
     return 5 
    } 

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 
     let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! CustomCell 

     cell.imageViewGame.image = UIImage(named: imageArray[indexPath.row]) 

     return cell 
    } 

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { 
     return CGSize(width: view.frame.width/2, height: view.frame.width/2) 
    } 

    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { 
     performSegue(withIdentifier: "postController", sender: title[indexPath.row]) 
    } 

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
     if segue.identifier == "postController" { 
      let postController = segue.destination as! PostController 

      postController.title = sender as! String 

     } 
    } 
} 

有没有人知道从这段代码为什么我的应用程序崩溃？如果重要，我不使用故事板。

Answer 1

试试这个：

1. 请你不要忘记你的SEGUE声明PostController中标识

你只可以用模态表示：

覆盖FUNC的CollectionView（_的CollectionView：UICollectionView，didSelectItemAt indexPath：IndexPath）{

 let postController = PostController() 
     postController.title = title[indexPath.row] 
     present(postController, animated: true, completion: nil) 
    }