Swift 打开新的 UIViewController

Question

当我点击UICollectionView 中的一个项目时，我试图打开新的UIViewController，但使用此代码我的应用程序崩溃，Xcode 和模拟器重新启动，所以我什至看不出问题出在哪里。

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

        }
    }
}

有人从这段代码中知道我的应用为什么会崩溃吗？如果它很重要，我不会使用情节提要。

Answer 1

试试这个：

1. 让您不要忘记在您的 segue 中声明 postController 标识符

1. 您可以通过以下方式以模态方式呈现它：

覆盖 func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

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