如何獲取UICollectionView標頭的索引路徑？

Question

使用視圖的indexPathForItemAtPoint，我將得到一個單元格的索引路徑，但從來沒有UICollectionReusableView（header/footer） - 因爲它總是返回nil。

Answer 1

您應該將自己的字典映射到標題視圖的索引路徑。在你的collectionView:viewForSupplementaryElementOfKind:atIndexPath:方法中，在返回之前將視圖放入字典中。在您的collectionView:didEndDisplayingSupplementaryView:forElementOfKind:atIndexPath:中，從字典中刪除視圖。

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 
    } 
} 

現在didSelectSection：

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 
    } 
}