Question

我有一个自定义UICollectionViewCell，它可以选择和取消选择单个单元格。当您选择然后取消选择单元格，滚动到UICollectionView时，问题就会出现，当您返回之前选择的单元格时，表明它已被选中。这是一些可重用性问题。

这是我选择和取消选择单元格的方式：

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let cell = collectionView.cellForItem(at: indexPath)! as! CreateNotebookCVCell
    if selectedIndexPath != indexPath || selectedIndexPath == nil {
        // Select Cell
        selectedIndexPath = indexPath
        cell.showDimViewAndCheckmark()
        selectedCover = notebookCovers[indexPath.row]
        saveButton.isEnabled = true
    }
    else {
        // Deselect Cell
        selectedIndexPath = nil
        cell.hideDimViewAndCheckmark()
        selectedCover = nil
        saveButton.isEnabled = false
    }
}

这是单元格中的代码：

override func awakeFromNib（）{ super.awakeFromNib（） setUI（） // hideDimViewAndCheckmark（） }

override func prepareForReuse() {
    super.prepareForReuse()
    hideDimViewAndCheckmark()
    coverImageView.image = nil
}

func hideDimViewAndCheckmark() {
    dimView.isHidden = true
    checkmarkIcon.isHidden = true
}

func showDimViewAndCheckmark() {
    dimView.isHidden = false
    checkmarkIcon.isHidden = false
    dimView.layer.cornerRadius = 10
    dimView.clipsToBounds = true
    dimView.layer.borderWidth = 2
    dimView.layer.borderColor = Colors.purpleDarker.cgColor
    dimView.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMaxXMaxYCorner]
}

override var isSelected: Bool {
    didSet {
        if isSelected {
            UIView.animate(withDuration: 0.1, animations: { [unowned self] in
                self.showDimViewAndCheckmark()
            })
        }
        else {
            UIView.animate(withDuration: 0.1, animations: { [unowned self] in
                self.hideDimViewAndCheckmark()
            })
        }
    }
}

不确定在这里我在做什么错

更新：cellForRowAt根据要求的方法

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Cell_Id.createNotebook, for: indexPath) as! CreateNotebookCVCell
    let cover = notebookCovers[indexPath.row]
    cell.coverImageView.image = UIImage(named: cover)
    return cell
}

Answer 1

尝试一下

-cellForItem函数

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

    if selectedIndexPath == indexPath{
        cell.showDimViewAndCheckmark()
        selectedCover = notebookCovers[indexPath.row]
        saveButton.isEnabled = true
    } else {
        cell.hideDimViewAndCheckmark()
        selectedCover = nil
        saveButton.isEnabled = false
    }

    return cell
}

-didSelectItemAt函数

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


if selectedIndexPath != indexPath || selectedIndexPath == nil {
    // Select Cell
    selectedIndexPath = indexPath
} else {
    // Deselect Cell
    selectedIndexPath = nil
}

collectionView.reloadData()
}

UICollectionView重用后选择先前选择的单元格

1 个答案: