swift - #selector 的局部函数

Question

我正在构建这个应用程序来显示我家乡周围的餐馆，并为他们提供菜单、营业时间和地址。我这里有这个功能，可以在 Collection View 中显示有关餐厅的信息

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

    cell.addressLabel.text = addressArray[indexPath.row]
    cell.restaurantNameLabel.text = restaurantArray[indexPath.row]
    cell.openingTimeLabel.text = openingTimeArray[indexPath.row]
    cell.chosenRestaurantButton.addTarget(self, action: #selector(getProducts), for: .touchUpInside)

    return cell
}

这是我在 Collection View 函数中传递给#selector 的函数。问题是我需要 getProducts 函数中的 Collection View 函数的索引路径。我无法嵌套函数，它会抛出有关局部函数的错误。有什么方法可以在 getProducts 函数中获取索引路径？

func getProducts() {
    let viewController = storyboard?.instantiateViewController(withIdentifier: "productsCollectionView") as! ProductsViewController
    viewController.restaurantChosen = restaurantArray[indexPathVariable.row]
    self.present(viewController, animated: true, completion: nil)
}

Answer 1

您不能对可重用单元格中的按钮执行此类操作。为什么不在 RestaurantCollectionViewCell 子类中使用委托(delegate)？

protocol RestaurantCollectionViewCellDelegate: class
{
    func getProducts(indexPath: IndexPath)
}

class RestaurantCollectionViewCell: UICollectionViewCell
{
    var indexPath: IndexPath!
    weak var delegate: RestaurantCollectionViewCellDelegate?

    @IBAction func buttonPressed(_ sender: UIButton)
    {
        self.delegate?.getProducts(indexPath: self.indexPath)
    }
}

在您的 CollectionView Controller 中，只需像这样分配委托(delegate):

class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, RestaurantCollectionViewCellDelegate
{
    func getProducts(indexPath: IndexPath)
    {
        let viewController = storyboard?.instantiateViewController(withIdentifier: "productsCollectionView") as! ProductsViewController
        viewController.restaurantChosen = restaurantArray[indexPath.row]
        self.present(viewController, animated: true, completion: nil)
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCustomCVCell", for: indexPath) as! RestaurantCollectionViewCell
        cell.indexPath = indexPath
        cell.delegate = self
        return cell
    }
}