ios - 如何在要删除的单元格上使用 longtapGesture 从 Collection View 中删除 uicollectionviewcell？ swift

Question

如何使用长按手势从 Collection View 中删除所选项目并显示重新加载的数据，因为我无法使用 indexpath.row 方法执行此操作。我正在使用 UIAlertAction 来实现此操作。但是不能在 longtapGesture 上点击单元格。

 func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let mainstoryboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let detailVC = mainstoryboard.instantiateViewController(withIdentifier: "detailVC") as! DetailVC
        detailVC.image = Model.dataList[indexPath.item].image
        self.navigationController?.pushViewController(detailVC, animated: true)

        let tapGes = UILongPressGestureRecognizer(target: self, action: #selector(self.didlongPress(tapGes:)))
        self.view.addGestureRecognizer(tapGes)
    }

//    func removeItem(index : Int){
//        Model.dataList.remove(at: index)
//        
//        let indexPath = IndexPath(row: index, section: 0)
//        collectionView.performBatchUpdates({ 
//            self.collectionView.deleteItems(at: [indexPath])
//        }) { (finished : Bool) in
//            self.collectionView.reloadItems(at: self.collectionView.indexPathsForVisibleItems)
//        }
//    
//    }
//    


    func didlongPress(tapGes : UITapGestureRecognizer){
        let actionController = UIAlertController(title: "Delete", message: "Are You Sure ...?", preferredStyle: .actionSheet)

        let action = UIAlertAction(title: "Delete Current record", style: .default) { (action) in
            print("Deleted")

            self.collectionView.reloadData()
        }

        actionController.addAction(action)
        self.present(actionController, animated: true, completion: nil)

    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as? CollectionCell
        let note = Model.dataList[indexPath.item]
        cell?.imageView.image = note.image
        cell?.titleLbl.text = note.title


        return cell!
    }

Answer 1

嘿，下面的算法对你有用。

• 点击时只需从数组“数据列表”中删除该项目indexPath 通过调用“datalist.remove(at: indexPath.row)”。
• 之后只需调用“self.collectionView.deleteItemsAtIndexPaths([indexPath])”。
• 这样您就不必重新加载 collectionView。

祝你好运:)