为什么以编程方式选择单元格后 - 单元格不是交互？

Question

我在以编程方式选择的 collectionView 中设置了一个单元格：

  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(with: FAFavouriteCategoryCell.self, for: indexPath)!
        let currentCategory = categories[indexPath.row]
        cell.isSelected = selectedCategories.contains(currentCategory.categoryID)
        cell.configCell(category: currentCategory)
        return cell
    }

在此之后所有选定的单元格都不起作用。 我无法点击它。 如果我单击方法shouldDeselectItemAt不调用

Answer 1

您需要像这样调用selectItem

  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(with: FAFavouriteCategoryCell.self, for: indexPath)!
        let currentCategory = categories[indexPath.row]
        if selectedCategories.contains(currentCategory.categoryID) {
            collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .left) //Add this line
            cell.isSelected = true
        } else {
            collectionView.deselectItem(at: indexPath, animated: false)
            cell.isSelected = false
        }
        cell.configCell(category: currentCategory)
        return cell
    }