ios - 点击时更改 UICollectionViewCell 上的 ImageView 图像

Question

我有一个 UICollectionView，它的单元格使用自定义 xib 文件。在单元格中，我有一个用于复选框的 ImageView。我想在录制时更改`ImageView1 的图像。我尝试了以下代码片段，但它对我不起作用

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

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! V_Cell

    if show_delete == true {
        cell.img_delete.image = UIImage(named: "checked")
    }
}

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

    // Configure the cell

    let data = valves_[indexPath.row]
    cell.v_name.text = data

    if show_delete == true {
        cell.img_delete.isHidden = false
    } else if show_delete == false {
        cell.img_delete.isHidden = true
    }

    return cell
}

在这段代码中，我试图在 didSelectItemAt 中更改 ImageView 的图像。

我自定义的xib文件如下。

请建议一种使其工作的方法。谢谢。

Answer 1

对于这类问题，最好保留一个数组，其中包含是否检查给定 indexpath 中的项目。

var checkArray: [Bool] = [Bool](repeating: false, count: numberOfRowsInCollectionView)
// this should be the same size as number of items in collection view

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

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! V_Cell
    checkArray[indexPath.row] = !checkArray[indexPath.row] // if it's true, make it false and vice versa logic
    collectionView.reloadItems(at: [indexPath])
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! V_Cell

    // Configure the cell

    let data = valves_[indexPath.row]
    cell.v_name.text = data

    if show_delete == true {
        cell.img_delete.isHidden = false
    } else if show_delete == false {
        cell.img_delete.isHidden = true
    }

    if checkArray[indexPath.row] {
        cell.img_delete.image = //image for check
    }else {
        cell.img_delete.image = //image for no check
    }

    return cell
}