[翻译] HTKDragAndDropCollectionViewLayout

HTKDragAndDropCollectionViewLayout

Custom UICollectionViewLayout that works together with a custom UICollectionViewCell to provide drag and drop for a UICollectionView. Works just like UITableView drag and drop. What‘s unique about this approach is that it does not need to create a "ghost" or "dummy" cell to provide the drag and drop functionality. I believe this method is simpler and less complex for the majority of use cases.

自定义UICollectionViewLayout，与UICollectionViewCell一起使用，提供拖拽功能。就像UITableView的拖拽功能一样。有点特别的地方就是你不需要创建出替代的cell来满足供你拖拽的动能。我相信，这个方法会简化你所写的代码。

Adding to your project: 添加到你的工程当中

Cocoapods

CocoaPods is the recommended way to add HTKDragAndDropCollectionViewLayout to your project.

建议你用CocoaPods来导入到你的工程当中。

1. Add a pod entry for HTKDragAndDropCollectionViewLayout to your Podfile pod ‘HTKDragAndDropCollectionViewLayout‘, ‘~> 0.0.1‘ 添加‘HTKDragAndDropCollectionViewLayout‘, ‘~> 0.0.1‘到pod中
2. Install the pod(s) by running pod install. 执行安装
3. Subclass HTKDragAndDropCollectionViewController. 创建出HTKDragAndDropCollectionViewController子类
4. Setup HTKDragAndDropCollectionViewLayout properties (itemSize, lineSpacing, etc). 设置HTKDragAndDropCollectionViewLayout属性
5. Subclass and use HTKDraggableCollectionViewCell which implements the gestures for dragging. 创建出HTKDraggableCollectionViewCell子类然后实现手势与拖拽
6. Implement - (void)userDidEndDraggingCell:(UICollectionViewCell *)cell and if theHTKDragAndDropCollectionViewLayout finalIndexPath is not nil, insert the draggedIndexPath into the finalIndexPath‘s position. See example in project. 实现方法- (void)userDidEndDraggingCell:(UICollectionViewCell *)cell，如果theHTKDragAndDropCollectionViewLayout最后的indexPath为nil，将draggedIndexPath插入到最后的位置上。请看demo工程。