如何为多个UIView添加撤消管理器 [英] how to add undo manager for multiple UIView

问题描述

我需要一些有关如何使用UndoManager执行撤消操作的想法.

I need some idea to how perform undo opertaion with UndoManager.

在我的应用程序中，用户可以在屏幕上添加尽可能多的礼物(UIView).他可以重新安排&调整该屏幕上所有已添加礼物的大小.

In my app user can add as many gifts (UIView) on a screen. He can rearrange & resize all added gifts on that screen.

用于添加，重新排列&调整礼物大小后，我做了一个UIView&在该课程中，我已经为触摸委托实现了相同操作的代码.

For adding, rearranging & resizing gifts, I have made a subclass of UIView & in that class I have implemented code for the same operations on touch delegates.

现在我的问题是，如果用户重新布置了多个礼物，还调整了其中一些的尺寸，我该如何实施unanamanger将所有礼物恢复到原来的位置.

Now my question is that if user has rearranged multiple gifts & also resize some of them, how I can implement a undomanager to restore all the gifts in original position.

任何想法或建议现在都很好.

Any idea or suggestion would be great at this time.

推荐答案

如果您要撤消位置更改，请调整大小&旋转 UIViews ，您需要握住框架，并在手势开始时对其进行变换.这样，在执行撤消操作时，您可以还原为初始值.

If you want to undo the change of position, size & rotation of UIViews, you need to hold the frame, transform of it when the gesture started. So that when perform undo, you can revert to the initial values.

您可以参考以下 answer

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