ios - 如何在UICollectionView中获取选定的CollectionViewCell？

Question

我是IOS开发的新手，我尝试使用UIcollectionView显示照片而不使用storyboard。

我创建一个xib file调用AITFileCell_grid.xib，并添加一个Collection View Cell。

我还创建了另一个xib file并添加了Collection View以加载Collection View Cell。

我想选择多个文件并通过delete button删除它们。

但是，当我按以下代码单击delete button时，无法获得该单元格。

if(self.collectionView.indexPathsForSelectedItems > 0){
        NSLog(@"indexPathsForSelectedItems...count.%@..@@@" , self.collectionView.indexPathsForSelectedItems);


        for(NSIndexPath *indexPath in self.collectionView.indexPathsForSelectedItems){

//            [self.collectionView deselectItemAtIndexPath:indexPath animated:NO];
            NSString *filePath = [NSString stringWithFormat:@"%@/%@", directory, [fileList objectAtIndex:indexPath.row]];
            [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil] ;
            AITFileCell_grid *cell = [self.collectionView dequeueReusableCellWithReuseIdentifier:@"AITFileCell_grid" forIndexPath:indexPath];
        }
    }

但是卖出似乎不正确...

如何获取selected cell 中的 collectionView？

Answer 1

通常，您的删除按钮应具有如下选择器:

deleteButton = [[UIButton alloc] init];
...
[deleteButton addTarget:self selector:@sel(buttonPressed:) forControlEvent:UIControlEventTouchUpInside];

我相信您可以使用以下方法获取indexPath:

-(void)buttonPressed:(id)sender
{
    UIButton *button = (UIButton *)sender;

    CGPoint rootPoint = [button convertPoint:CGPointZero toView:self.collectionView];

    NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:rootPoint];

    // -----------------------------------------------------------------
    // Now you have your indexPath, you can delete your item
    // -----------------------------------------------------------------



    // first update your data source, in this case, I assume your data source 
    // is a list of values stored inside a NSArray

    NSMutableArray *updatedList = [self.myListData mutableCopy];

    [updatedList removeObjectAtIndex:indexPath.row];

    self.myListData = updatedList;


    // now update your interface

    [self.collectionView performBatchUpdates:^{
        [self.collectionView deleteItemsAtIndexPath:@[indexPath]];
    }];
}