如何获取UICollectionView头的索引路径？

Question

使用视图的indexPathForItemAtPoint，我将得到一个单元格的索引路径，但永远不会得到UICollectionReusableView（页眉/页脚） - 因为它总是返回nil。

Answer 1

您应该创建自己的字典映射到标题视图的索引路径。在你的collectionView:viewForSupplementaryElementOfKind:atIndexPath:方法中，在返回之前将视图放入字典中。在你的collectionView:didEndDisplayingSupplementaryView:forElementOfKind:atIndexPath:中，从字典中删除视图。

Answer 2

override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
    switch kind {
    case UICollectionElementKindSectionHeader:
        let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "header", for: indexPath) as! HeaderCollectionReusableView
        let gestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(didSelectSection(gesture:)))
        headerView.addGestureRecognizer(gestureRecognizer)
        return headerView
    }
}

现在在didSelectSection中：

let indexPaths = self.collectionView?.indexPathsForVisibleSupplementaryElements(ofKind: UICollectionElementKindSectionHeader)
for indexPath in indexPaths! {
    if (gesture.view as! HeaderCollectionReusableView) == collectionView?.supplementaryView(forElementKind: UICollectionElementKindSectionHeader, at: indexPath){
        print("found at : \(indexPath)")
        break
    }
}