如何从集合视图中删除单元格？

Question

当用户touchUpInside(Button) 删除单元格时，我想从UICollectionview 中删除单元格。

这是我的代码：

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

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

    cell.myLabel.text = self.items[indexPath.row]

    cell.deleteBtn?.layer.setValue(indexPath.row, forKey: "Cdelete")
    cell.deleteBtn?.addTarget(self, action: Selector(("deleteColor:")), for: UIControlEvents.touchUpInside)


    cell.backgroundColor = UIColor.cyan // make cell more visible in our example project

    return cell
}

func deleteColor(sender:UIButton) {

    let i : Int = (sender.layer.value(forKey: "Cdelete")) as! Int
    self.items.remove(at: i)
    collectionView.reloadData()
}

我哪里做错了？

Answer 1

为您的删除按钮设置标签以获取当前单元格/知道您点击了哪个单元格

cell.deleteBtn?.tag = indexPath.row
cell.deleteBtn?.addTarget(self, action: #selector(yourVCName. deleteColor(_:)), for: .touchUpInside)

然后打电话

@IBAction func deleteColor(_ sender: UIButton){
   print("Button pressed ? ")
  // continue your work

           var hitPoint = sender.convert(CGPoint.zero, to: yourCollectionViewName)
   var hitIndex: IndexPath? = yourCollectionViewName.indexPathForRow(at: hitPoint)

        self.items.remove(at: hitIndex.row)
          self.yourCollectionViewName.performBatchUpdates({
    self.yourCollectionViewName.deleteItems(at: [hitIndex])
}) { (finished) in
    self.yourCollectionViewName.reloadItems(at: self.yourCollectionViewName.indexPathsForVisibleItems)
}

 }