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Question

我有UICollectionView使用自定义xib文件的单元格。在单元格中，我有一个ImageView复选框。我想在录制时更改`ImageView1的图像。我尝试了以下代码段，但它不适合我

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
}

在此代码中，我尝试更改ImageView中didSelectItemAt的图像。

我的自定义xib文件如下。

请建议一种让它运作的方法。感谢。

Answer 1

对于这些类型的问题，最好保留一个数组，其中包含是否检查给定indexpath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
}

Answer 2

最后我通过以下代码解决了它。

INSERT INTO my_table (other_column, third_column) VALUES (…, …);
    -- not specifying any value for my_column manually,
    -- it'll be initialized automatically to some value
    -- (usually an increasing integer sequence)

我将taped元素索引放在数组中并重新加载indexpath中的项目。如果数组包含重新加载的索引，则显示复选标记，否则将删除复选标记。