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 indexPath for cell c $ c>？

我有水平滚动，只有一个大的单元格可见（部分另外两个<$两侧的c $ c> cell 也是可见的。
我需要删除位于中心的 cell （表示 - 当前单元格）而不触及它。 / p>

仅按废纸篓按钮并确认删除。但现在它只删除第一个单元格 s。

   - （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'，[technology.techniquename UTF8String]]]; 
 
 [arrayOfTechnique removeObjectAtIndex：self.tappedCellPath.row]; 
 
 // [arrayOfTechnique removeObjectAtIndex：[custom_layout]]; 
 [self removeImage：technique.techniquename]; 
 
 [self.collectionView performBatchUpdates：^ {
 [self.collectionView deleteItemsAtIndexPaths：[NSArrayarrayWithObject：self.tappedCellPath]]; 
}完成：nil]; 
 
 [self checkArrayCount]; 
} 
} 
  

解决方案

赞你自己做了， indexPathForItemAtPoint 是一个很好的方法来找到你感兴趣的元素的索引路径。如果你的问题是：我怎么知道这一点的坐标？然后你应该尝试（使用你在代码片段中给出的相同名称）：

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

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

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.

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];
    }
}

解决方案

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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