我应该使用哪种方法在UICollectionViewCells之间做一些事情？

Question

我已经实施了UICollectionView图片库。每个cell都有一些视图，我想在我更改当前cell时隐藏或显示该视图，至少在事件开始时。有什么方法吗？或者我应该由代表做什么？我有paging enabled和自定义cell以及FlowLayout。

我已经做了几乎所有事情tutorial

Answer 1

一种方法是将当前选定的单元格索引保留在viewController中的局部变量中，并在选择另一个单元格时使用该索引执行任何操作：

@property (nonatomic) NSIndexPath *selectedCellIndexPath;

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    if (![self.selectedCellIndexPath isEqual:indexPath]) {
        UICollectionViewCell *lastSelectedCell = [collectionView cellForItemAtIndexPath:selectedIndexPath];
        // Perform any change to lastSelectedCell before deselecting it
        [collectionView deselectItemAtIndexPath:lastSelectedIndexPath animated:YES];
    }
    self.selectedCellIndexPath = indexPath;
    UICollectionViewCell *selectedCell = [collectionView cellForItemAtIndexPath:indexPath];
    // Change what you want in the newly selected cell;
}