如何获取位于 UICollectionView 中心的单元格的 indexPath [英] how to get indexPath for cell which is located in the center of UICollectionView

问题描述

如何在 UICollectionView 中间找到 cell 的 indexPath?

How can i find indexPath for cell in the middle of UICollectionView?

我有水平滚动，只有一个大的 cell 是可见的(侧面的另外两个 cell 也是可见的).我需要删除位于中心的 cell(意味着 - 当前 cell)而不触摸它.

I have horizontal scrolling and only one big cell is visible (partially two other cells on the sides are visible as well). I need to delete cell located in the center (means - current cell) without touching it.

仅按垃圾箱"按钮并确认删除.但现在它只删除第一个 cells.

Only pressing "Trash" button and confirm Delete. But now it delete only first cells.

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
    if (buttonIndex == actionSheet.destructiveButtonIndex) { 
        initialPinchPoint = ????????

        self.tappedCellPath = [self.collectionView indexPathForItemAtPoint:initialPinchPoint];

        Technique *technique = [arrayOfTechnique objectAtIndex:self.tappedCellPath.row];

        [self deleteData:[NSString stringWithFormat:@"DELETE FROM TECHNIQUES WHERE TECHNIQUENAME IS '%s'",[technique.techniquename UTF8String]]];

        [arrayOfTechnique removeObjectAtIndex:self.tappedCellPath.row];

        //[arrayOfTechnique removeObjectAtIndex:[custom_layout ]];
        [self removeImage:technique.techniquename];

        [self.collectionView performBatchUpdates:^{
            [self.collectionView deleteItemsAtIndexPaths:[NSArrayarrayWithObject:self.tappedCellPath]];
         } completion:nil];

         [self checkArrayCount];
    }
}

推荐答案

就像你自己做的那样，indexPathForItemAtPoint 是找到你感兴趣的元素的索引路径的好方法.如果你问题是:我怎么知道这个点的坐标?然后您应该尝试使用(使用您在代码片段中给出的相同名称):

Like you did yourself, indexPathForItemAtPoint is a good way of finding the index path of the element you're interested in. If your question is: how do i know the coordinates of this point? Then you should try with (using the same name you gave it in your code snippet):

initialPinchPoint = CGPointMake(self.collectionView.center.x + self.collectionView.contentOffset.x, 
                                self.collectionView.center.y + self.collectionView.contentOffset.y);

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