Is there a way to view the undo stack?

Question

I'm learning about undo, and I'd like a way to peek into the undo objects (`NSInvocation`s) in the `undoManager` so I can see what's going on. I couldn't see anything like this in the docs, but maybe someone knows a way. Thanks.

Accepted Answer

You can use

```
class-dump -C NSUndo /System/Library/Frameworks/Foundation.framework/Foundation
```

to find out about the inner structure of the undo related classes. You will find that the NSUndoManager has two instance variables named _undoStack and _redoStack. It's pretty obvious how it's structured, so you can write a little method printing the stack. I found that quite handy for debugging undo related problems.

Is there a way to view the undo stack?

Solution

Problem