以编程方式从 collectionView Cell didSelectItemAt 推送到新的 ViewController - swift

Question

我试图创建一个以编程方式实现 UICollectionViewController 的简单应用程序。我已经创建了一些单元格，当用户点击特定单元格时应该移动到另一个控制器。但是我面临着哪个视图没有推送到下一个视图控制器的问题。

这是我在 appDelegate

中设置 rootViewController

    window = UIWindow(frame: UIScreen.main.bounds)
    window?.makeKeyAndVisible()
    let flow = UICollectionViewFlowLayout()
    let collectionView = ViewController(collectionViewLayout: flow)
    let navigation = UINavigationController(rootViewController: collectionView)
    window?.rootViewController = navigation

我是这样创建的UICollectionView

private let cellId = "cellid"
var viewController: ViewController?
override func viewDidLoad() {
    super.viewDidLoad()
    collectionView?.backgroundColor = .white
    collectionView?.register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellId)
    // Do any additional setup after loading the view, typically from a nib.
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath)
    cell.backgroundColor = .red
    return cell
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 5
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: view.frame.width, height: 210)
}

这是我在用户点击特定

时的控制方式

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print(indexPath.item)
    viewController?.pushView()
}

func pushView() {
    let controller = UINavigationController(rootViewController: DetailController())
    self.navigationController?.pushViewController(controller, animated: true)
}

即使函数被调用，但它永远不会推送到新的视图控制器

Answer 1

改变

viewController?.pushView()

到

self.pushView()

Answer 2

请试试这个：

let objMainController : yourViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "yourViewController") as! yourViewController

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = objMainController

请从情节提要中嵌入导航控制器。它可能会帮助 you.Thank 你。

Answer 3

首先你必须确保你当前的视图控制器有导航视图控制器，你可以通过在 viewDidLoad 方法 print(self.navigationViewController) 中打印对象来检查。如果打印 nil 那么你必须按照这些步骤制作导航控制器 - SelectYourVicotroller -> Go to Editor 菜单选项 -> Embed to -> Navigation Controller

func pushView() {

    let controller =  DetailController()
    //OR

//Add the storyboard identifier of your view controller - "DetailController"

    let controller =  self.storyboard.instantiateViewController(withIdentifier: "DetailController") as! DetailController

    self.navigationController?.pushViewController(controller, animated:true)

}

将此方法调用到didSelect方法中

以编程方式从 collectionView Cell didSelectItemAt 推送到新的 ViewController - swift

Pushing to new ViewController from collectionView Cell didSelectItemAt programmatically - swift

uinavigationcontroller

ios

uicollectionviewcell

swift

uicollectionviewflowlayout