如何删除 UICollectionView 上的单元格

Question

我在每个单元格上创建了一个按钮，onClick 让用户删除我的 UICollectionView 的单元格，我在其中初始化单元格我使用以下代码将 indexPath.item 传递给按钮方法：

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];



    // Configure the cell
    FidelityProducts *item = _feedItems[indexPath.item];
    NSLog(@"index dell'item:%ld", (long)indexPath.item);

    cell.deleteProduct.tag = indexPath.item;
    NSLog(@"TAG ASSEGNATO AL BOTTONE: %d",cell.deleteProduct.tag);
    [cell.deleteProduct addTarget:self action:@selector(DeleteProductFromArray:)
     forControlEvents:UIControlEventTouchUpInside];

    return cell;
}

然后在 DeleteProductFromArray 我创建了以下逻辑以删除单元格：

- (void)DeleteProductFromArray:(UIButton *)button {

    [_feedItems removeObjectAtIndex:button.tag];

    //check for the Column (can be 0 or 1)
    if(button.tag % 2 == 0)
    {
        IndexColumn = 0;
    }
    else
    {
        IndexColumn = 1;
    }

    //check for the Row
    if(button.tag > 1)
    {
        IndexRow = button.tag/2;
    }
    if(button.tag <= 1)
    {
        IndexRow = 0;
    }
    NSLog(@"button column =%d", IndexColumn);
    NSLog(@"button row =%d", IndexRow);

    [self.customCollectionView deleteItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:IndexColumn inSection:IndexRow]]];

}

现在，我知道这会导致问题，因为当我从我的 NSMutableArray 中删除一个项目时按钮标签没有更新，但我只需要知道为什么我第一次尝试删除数字 1 的单元格和 2 被取消，但如果我点击单元格 > 3 应用程序崩溃并出现以下错误：

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to delete item 0 from section 2, but there are only 1 sections before the update

Answer 1

我傻了。所有的按钮逻辑都没有用，我忘了检查部分的数量，它们总是 0。已更改

[self.customCollectionView deleteItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:IndexColumn inSection:IndexRow]]];

收件人：

 [self.customCollectionView deleteItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:button.tag inSection:0]]];

一切都按预期进行..

如何删除 UICollectionView 上的单元格

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