我实现了CollectionView的拖放操作，因此可以移动集合中的单元格。当我拖动一个单元格时，我只想触摸该单元格一次或将其保持很短的射击时间即可进行拖放。如何更改保持单元格以启用拖放所需的时间？
@IBOutlet weak var colectionViewOne: UICollectionView! {
didSet{
colectionViewOne.dataSource = self
colectionViewOne.delegate = self
colectionViewOne.dragDelegate = self
colectionViewOne.dropDelegate = self
colectionViewOne.dragInteractionEnabled = true
}
}
func collectionView(_ collectionView: UICollectionView, performDropWith coordinator: UICollectionViewDropCoordinator) {
let destinationIndexPath = coordinator.destinationIndexPath ?? IndexPath(item: 0, section: 0)
for item in coordinator.items {
if let sourceIndexPath = item.sourceIndexPath {
if let attributedString = item.dragItem.localObject as? NSAttributedString {
collectionView.performBatchUpdates({
temporaryModel.remove(at: sourceIndexPath.item)
temporaryModel.insert(attributedString.string, at: destinationIndexPath.item)
collectionView.deleteItems(at: [sourceIndexPath])
collectionView.insertItems(at: [destinationIndexPath])
})
coordinator.drop(item.dragItem, toItemAt: destinationIndexPath)
}
}
}
}
func collectionView(_ collectionView: UICollectionView, canHandle session: UIDropSession) -> Bool {
return session.canLoadObjects(ofClass: NSAttributedString.self)
}
func collectionView(_ collectionView: UICollectionView, dropSessionDidUpdate session: UIDropSession, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UICollectionViewDropProposal {
let isSelf = (session.localDragSession?.localContext as? UICollectionView) == collectionView
return UICollectionViewDropProposal(operation: isSelf ? .move : .copy, intent: .insertAtDestinationIndexPath)
}
func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
session.localContext = collectionView
return dragItem(at: indexPath)
}
func dragItem(at indexpath: IndexPath) -> [UIDragItem]{
if let attributedString = ( colectionViewOne.cellForItem(at: indexpath) as? PracticeDragDropCellCollectionViewCell)?.cellTextLabel.attributedText{
let dragItem = UIDragItem(itemProvider: NSItemProvider(object: attributedString))
dragItem.localObject = attributedString
return [dragItem]
}
else {
return []
}
}