以編程方式從collectionView Cell didSelectItemAt推送到新的ViewController-Swift

Question

我試圖創建一個簡單的應用程序， UICollectionViewController編程方式實現UICollectionViewController 。 我創建了一些單元格，當用戶單擊特定單元格時，應將其移至另一個控制器。 但是我面臨着哪個視圖沒有推送到下一個視圖控制器的問題。

這里是我的設置RootViewController的appDelegate

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

這是我創建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)
}

這是我如何控制用戶何時點擊特定內容

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)
}

即使函數被調用，但它永遠不會推送到新的視圖控制器

Answer 1

請嘗試以下方法：

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

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

請從情節提要中嵌入導航控制器。 可能會對您有所幫助。謝謝。

Answer 2

首先，您必須確保當前的視圖控制器具有導航視圖控制器，您可以通過在viewDidLoad方法print（self.navigationViewController）中打印對象來進行檢查。 如果打印為零，則必須使導航控制器執行以下步驟-SelectYourVicotroller->轉到編輯器菜單選項->嵌入到->導航控制器

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)

}

將此方法調用為didSelect方法

Answer 3

更改

viewController?.pushView()

至

self.pushView()