ios - 在没有 Storyboard /xib的 View Controller 之间导航

我正在开发没有情节提要/ xib的应用程序，事实证明这是一个挑战。我有一个UICollectionView（广告），用户可以在其中点击一个单元格以导航到新的视图控制器以显示该广告的详细信息。以下是我遇到的错误的gif图像。



如您所见，当我点击单元格后，UICollectionView会粘住。我的adDetailsViewController子类中有一个AdsViewController属性，当我点击单元格时，此代码将执行：

adDetailsViewController.adTitle = adTitles[indexPath.row]
navigationController?.pushViewController(adDetailsViewController, animated: true)

以下是viewDidLoad的生命周期方法（当前仅为adDetailsViewController）：

class AdDetailsViewController: UIViewController {

    var adTitle: String?

    override func viewDidLoad() {
        super.viewDidLoad()

        let label = UILabel(frame: view.bounds)
        label.textAlignment = .center
        label.center = view.center
        label.text = adTitle

        view.addSubview(label)
    }
}

为了完整起见，这是AdsViewController的其余部分：

class AdsViewController: UIViewController {

    lazy var collectionView: AdsCollectionView = {
       let collectionView = AdsCollectionView(frame: view.frame, collectionViewLayout: TiledFlowLayout())
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.register(AdCollectionViewCell.self, forCellWithReuseIdentifier: "AdCell")
        view.addSubview(collectionView)
        return collectionView
    }()

    let adDetailsViewController = AdDetailsViewController()

    let adTitles = ["1", "2", "3", "4", "5", "6"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        collectionView.translatesAutoresizingMaskIntoConstraints = false
        collectionView.topAnchor.constraint(equalTo: view.topAnchor, constant: 8).isActive = true
        collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
        collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0).isActive = true
        collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0).isActive = true

        view.backgroundColor = .white
    }
}

extension AdsViewController: UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return adTitles.count
    }

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

        cell.textLabel.text = adTitles[indexPath.row]

        return cell
    }
}

extension AdsViewController: UICollectionViewDelegate {
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        adDetailsViewController.adTitle = adTitles[indexPath.row]
        navigationController?.pushViewController(adDetailsViewController, animated: true)
    }
}

extension AdsViewController: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: (self.view.frame.size.width / 2) - 10, height: self.view.frame.size.height / 4)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
    }
}

最佳答案

好的，我修复了。看来，如果将backgroundColor的AdDetailsViewController设置为UIColor.white，则它会按预期过渡。

关于ios - 在没有 Storyboard /xib的 View Controller 之间导航，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/46992842/