Question

我有一个包含多个单元格的集合视图。当用户单击该单元格时，它将选择另一个视图控制器。如何将用户单击的那个单元格的图像插入新的视图控制器？

我已经在主视图控制器中尝试过此操作：

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let vc =   storyboard?.instantiateInitialViewController(withIdentifier: "FoodDetailViewController") as? FoodDetailViewController
    self.navigationController?.pushViewController(vc!, animated: true )
}

这是Detail segue的代码：

class FoodDetailViewController: UIViewController {

var recipe: Recipe!
var text: String!
var body: String!


@IBOutlet weak var foodImage: UIImageView!


override func viewDidLoad() {
        super.viewDidLoad()
        title = recipe.name

}

private lazy var imageView: UIImageView = {
    let view = UIImageView()
    view.image = UIImage(named: "PP grey")
    return view
}()

var image: UIImage? {
    didSet {
        imageView.image = image
    }
}

Answer 1

您可以尝试

let vc = storyboard!.instantiateInitialViewController(withIdentifier: "FoodDetailViewController") as! FoodDetailViewController
vc.recipe = recipes[indexPath.item] // assign property here
self.navigationController?.pushViewController(vc!, animated: true)

注意：使用pushViewController与segues无关，如果要使用segue，则重写prepeareForReuse方法并将数据设置为目标vc

Answer 2

在collectioView didSelectItemAt方法中，您只需要获取SELECTED单元格，然后从该单元格中获取图像，然后简单地将其传递给NEXT ViewController。

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

        let cell = self.collectionView.cellForRowAtIndexPath(indexPath)
        let cell-image = cell?.IMAGEVIEW.image

        let vc =   storyboard?.instantiateInitialViewController(withIdentifier: "FoodDetailViewController") as? FoodDetailViewController
        vc.image = cell-image
        self.navigationController?.pushViewController(vc!, animated: true )
   }


   class FoodDetailViewController: UIViewController {
       var image: UIImage?
   }

Answer 3

您可以做的是在情节提要中添加一个segue并覆盖功能prepare(for segue:, sender:)，在其中您需要使用所需的食谱来设置FoodDetails。做类似的事情：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   // you need to identify your segue in the storyboard 
   if segue.identifier == "GoToFoodDetails" {
        if let viewController = segue.destination as? FoodDetailViewController {
            viewController.recipe = selectedRecipe
        }
    }
}

对于所选食谱，您可以使用didSelectItemAt

来创建变量并进行设置。

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    selectedRecipe = recipes[indexPath.row]
    performSegue(withIdentifier: "GoToFoodDetails", sender: self)
}

如何将数据从集合视图单元格转移到其他视图控制器？

3 个答案: