Created
April 22, 2020 03:08
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| class ViewController: UIViewController { | |
| func setupCollectionView() { | |
| self.collectionView.collectionViewLayout = columnLayout | |
| self.collectionView.dataSource = self | |
| self.collectionView.dragInteractionEnabled = true | |
| self.collectionView.dragDelegate = self | |
| self.collectionView.dropDelegate = self | |
| } | |
| func updateDataIndex(from fromIndexPath: IndexPath, to toIndexPath: IndexPath) { | |
| let fromPosition = fromIndexPath.item | |
| let toPosition = toIndexPath.item | |
| let selected = cellDataList[fromPosition] as Int | |
| DispatchQueue.main.async {[weak self] in | |
| self?.cellDataList.remove(at: fromPosition) | |
| self?.cellDataList.insert(selected, at: toPosition) | |
| self?.collectionView.reloadData() | |
| UIView.performWithoutAnimation { | |
| self?.collectionView.reloadSections(IndexSet(integersIn: 0...0)) | |
| } | |
| } | |
| } | |
| } | |
| extension ViewController: UICollectionViewDropDelegate { | |
| func collectionView(_ collectionView: UICollectionView, performDropWith coordinator: UICollectionViewDropCoordinator) { | |
| if (collectionView.hasActiveDrag) { | |
| if let destinationIndexPath = coordinator.destinationIndexPath { | |
| updateDataIndex(from: coordinator.items.first!.sourceIndexPath!, to: destinationIndexPath) | |
| } | |
| } | |
| } | |
| func collectionView(_ collectionView: UICollectionView, | |
| dropSessionDidUpdate session: UIDropSession, | |
| withDestinationIndexPath destinationIndexPath: IndexPath?) -> UICollectionViewDropProposal { | |
| return UICollectionViewDropProposal(operation: .move, intent: .insertAtDestinationIndexPath) | |
| } | |
| } |
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