ios UICollectionView 单元格选择和取消选择问题

Question

我使用 UIcollection View 作为我的标签栏 当我水平滚动 Collection View 时，当我选择新的单元格时，前一个选定的单元格不会取消选择

这是我选择一个单元格和取消选择一个单元格时改变颜色的代码

  var selectedIndexPath : IndexPath = []
func collectionView(_ collectionView: UICollectionView, 
didSelectItemAt indexPath: IndexPath) {

   if let cell = collectionView.cellForItem(at: indexPath) as? 
   BottomCollectionViewCell {
        cell.contentView.backgroundColor = UIColor.orange
        cell.backgroundColor = UIColor.orange
   }

  if let preViousSelectedcell = collectionView.cellForItem(at: 
  selectedIndexPath) as? BottomCollectionViewCell {

     preViousSelectedcell.contentView.backgroundColor=UIColor.purple
     preViousSelectedcell.backgroundColor = UIColor.purple
 }
 selectedIndexPath = indexPath


}

Answer 1

当滚动单元格被重用时 cellForItemAt 将调用，因此您需要更改代码中的一些修改

func collectionView(_ collectionView: UICollectionView, 
didSelectItemAt indexPath: IndexPath) {
 selectedIndexPath = indexPath
 YOUR_COLLECTION_VIEW.reloadData()
}

并在 collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath)

中添加以下行

if indexPath ==  selectedIndexPath {
     cell.contentView.backgroundColor=UIColor.purple
     cell.backgroundColor = UIColor.purple
} else {
     cell.contentView.backgroundColor = UIColor.orange
     cell.backgroundColor = UIColor.orange
}

希望对你有帮助