Swift中集合视图中单元格的重新排序

class MyCollectionViewDataSource: NSObject, UICollectionViewDataSource {
    var items: [String] = ["Item 1", "Item 2", "Item 3", "Item 4", "Item 5"]
    
    // 实现其他必要的数据源方法
    
    func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
        let movedItem = items.remove(at: sourceIndexPath.item)
        items.insert(movedItem, at: destinationIndexPath.item)
    }
}

// 在使用集合视图的地方
let collectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: UICollectionViewFlowLayout())
let dataSource = MyCollectionViewDataSource()
collectionView.dataSource = dataSource

// 设置集合视图的拖动重新排序功能
if let flowLayout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
    flowLayout.itemSize = CGSize(width: 100, height: 100)
    flowLayout.minimumInteritemSpacing = 10
    flowLayout.minimumLineSpacing = 10
    flowLayout.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
    flowLayout.scrollDirection = .vertical
}

// 允许集合视图的单元格拖动
collectionView.dragInteractionEnabled = true
collectionView.dragDelegate = self
collectionView.dropDelegate = self

// 实现其他必要的拖放代理方法

// 在拖动结束后，调用以下方法重新加载集合视图
collectionView.reloadData()