On 13 Jan 2014, at 15:21, Markus Spoettl <ms_li...@shiftoption.com> wrote:

> Hi,
> 
>  I have an app that uses UIDocument and NSUndoManager. That way the system 
> picks up changes to the data and knows when to auto-save.
> 
> Some parts of the model are not using the undo manager (mostly settings where 
> undo makes no sense or isn't wanted). Still that data is stored alongside the 
> main data.
> 
> What I want is that iOS saves whenever the app is backgrounded.
> 
> So the questions is: Can I safely call -updateChangeCount: when my app is 
> being sent to the background alongside the automatic NSUndoManager change 
> handling?
> 
> It seems to work quite nicely (when called from the app delegate's 
> -applicationWillResignActive:), but I'm not sure if that's just an illusion 
> and there's trouble waiting down the road.
> 
> Any thoughts?

By my understanding, you’re free to mix the two. UIDocument’s NSUndoManager 
integration should be implemented simply by calling through to 
-updateChangeCount: anyway.


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