ios - 如何将数组中的元素与indexPath.item进行比较？

Question

当我使用 didSelectItemAt indexPath 时，项目已添加到数组中并且数组包含多个元素，但只有一个单元格具有“矩形填充”图片

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    indexSelected = indexPath.item

    if trashButtonIsActive == true   {
        selectedItems.append(indexPath.item)
        // I am adding indexPath.item to the array.Which need to compare with indexPath.item in cellForItemAt method.//
    } else if trashButtonIsActive == false  {
        if selectedItems.count != 0 {
            selectedItems.removeAll()
        }

        self.performSegue(withIdentifier: "cardView", sender: indexPath)
    }

    self.collectionView.reloadData()
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if trashButtonIsActive == true && selectedItems.count == 0 {
        let  cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
        cell.labelText = array![indexPath.item].frontal
        cell.buttonToTrash.setImage(UIImage(named: "Rectangle Empty"), for: .normal)
        return cell
    }else if trashButtonIsActive == true && selectedItems.count != 0 {
        for index in selectedItems {
            //I don't know why , but it compares only first element in the array //
            if indexPath.item != index {
                let  cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
                cell.labelText = array![indexPath.item].frontal
                cell.buttonToTrash.setImage(UIImage(named: "Rectangle Empty"), for: .normal)
                return cell
            }else{
                let  cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
                cell.labelText = array![indexPath.item].frontal
                cell.buttonToTrash.setImage(UIImage(named: "Rectangle Filled"), for: .normal)
                return cell
            }
        }
    }else if trashButtonIsActive == false  {
        let  cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
        cell.labelText = array![indexPath.item].frontal
        cell.buttonToTrash.setImage(nil, for: .normal)
        return cell
    }

    let cellTwo = collectionView.dequeueReusableCell(withReuseIdentifier: "cell hello", for: indexPath)
    return cellTwo
}

我希望indexPath.row等于数组中的元素以具有图片“填充矩形”。有人可以帮忙吗？

Answer 1

让你的模型像这样

struct ModelName{
var name: String
var rectangle: Bool
}

那么你所选择的项目的数组将是这样的

var selectedItems = [ModelName]()

然后在 viewdidload 或任何您尝试初始化数据的地方都可以执行此操作

selectedItems.apped(ModelName(name: "name", rectangle: false)
selectedItems.apped(ModelName(name: "new", rectangle: true)
selectedItems.apped(ModelName(name: "newname", rectangle: false)
selectedItems.apped(ModelName(name: "namename", rectangle: false)

等等

然后在 cellforrow 处执行此操作

let item = selectedItems[indexPath.item]
cell.textlabel.text = item.name
if item.rectangle == true{
cell.rectButton.setImage(UIImage(named: "rectangle", for: .normal)
}else{
cell.rectButton.setImage(nil, for: .normal)}
return cell

我尝试过只使用名称和矩形，如果您不想用任何值初始化，则可以做任何您想做的事情，使该变量为零