CollectionView didDeselectItemAt没有在CollectionView中被单选调用

Question

以下是我的CollectionView代码

    categoryCollectionView.delegate = self
    categoryCollectionView.dataSource = self
    categoryCollectionView.allowsSelection = true
    categoryCollectionView.allowsMultipleSelection = false

下面是UICollectionViewCell代码

class AppPageCategoryViewCell: UICollectionViewCell {
var catgory : String?

@IBOutlet weak var titleLbl: UILabel!

@IBOutlet weak var closeImageView: UIImageView!



@IBOutlet weak var stackContainer: UIView!
var facet : Facets?

func setUI() {
    titleLbl.text = facet?.name ?? ""
    let isSelected = facet?.isSelected ?? false
    stackContainer.layer.borderColor =  UIColor.black.cgColor
    stackContainer.backgroundColor = isSelected ? UIColor.black : UIColor.white
    titleLbl.textColor = isSelected ? UIColor.white : UIColor.black
    closeImageView.image = closeImageView.image?.withRenderingMode(.alwaysTemplate)
    closeImageView.tintColor = UIColor.hexStringToUIColor(hex: AppStrings.whiteColor)
    stackContainer.layer.cornerRadius =  16
    stackContainer.layer.borderWidth = 1
    closeImageView.isHidden = !isSelected

  }
}

以下是选择确定方法

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

    print("deselect----------deselect")

}

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

     print("select----------select")

}

Now didDeselectItemAt不会被调用，如果我选择一个并选择另一个项目，或者如果我选择相同的项目didDeselectItemAt根本没有被调用，那只是在调用didSelectItemAt方法，为什么？该如何解决？

Answer 1

此委托方法未触发，因为您将布尔值“ allowsMultipleSelection”设置为false。允许取消选择该项必须为true。

https://developer.apple.com/documentation/uikit/uitableview/1614938-allowsmultipleselection