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在iOS中从uitableviewcell拖放到uiimage视图

[英]drag and drop from uitableviewcell to uiimage view in ios

原文 2013-07-01 12:52:40 2 1 iphone/ ios/ objective-c

I need help implementing a drag and drop gesture, I would like to know Your opinion to find the best approach. 我需要帮助来实现拖放手势，我想知道您的意见以找到最佳方法。

I have a view controller with a uitableview on the right and some image views on the left. 我有一个视图控制器，右边是uitableview，左边是一些图像视图。

I would like to allow the user to drag every cell of the table view on one of the image views. 我想允许用户将表格视图的每个单元格拖到其中一个图像视图上。 Basically the drag-n-drop will fail if the cell is not released on one of the image views, otherwise the image view will change image according to the dropped cell. 基本上，如果未在其中一个图像视图上释放单元格，则拖放操作将失败，否则图像视图将根据所放置的单元格更改图像。

What do You think is the best way to achieve this? 您认为实现此目标的最佳方法是什么？

In addition, when the user start dragging, I would like that he drags around a particular shaped subview, with image and data, not drag the semitransparent cell. 另外，当用户开始拖动时，我希望他拖动带有图像和数据的特定形状的子视图，而不是拖动半透明的单元格。

Thanks, 谢谢，

1 个解决方案

The basic steps for this would be: 基本步骤如下：

Add a long press gesture recognizer to your table view (the whole view, not individual cells) 将长按手势识别器添加到表格视图（整个视图，而不是单个单元格）
When the gesture begins, find which cell it is over (convert point, then user indexPathForRowAtPoint to get the cell) 手势开始时，找到它位于哪个单元格上（转换点，然后使用indexPathForRowAtPoint获取该单元格）
Make a copy of that cell which will become the dragged view (take a snapshot, add it to a UIImageView and add that to your main view). 制作该单元格的副本，该副本将成为拖动视图（拍摄快照，将其添加到UIImageView并将其添加到主视图）。 Or you could make the view look however you want if you dont want it to look like the cell 或者，如果您不希望视图看起来像单元格，则可以使视图看起来像您想要的那样
make your original cell hidden so it looks like it is being dragged 将您的原始单元格隐藏起来，使其看起来像在被拖动
On gesture changed, move teh position of this image view based on locationInView of the gesture) 更改手势后，根据手势的locationInView移动此图像视图的位置）
On gesture ended, check to see if the cell is over an image (hitTest: for this) and do any animations or calculations you need. 手势结束后，检查单元格是否在图像上方（hitTest：为此），并执行所需的任何动画或计算。