On May 15, 2013, at 11:50 PM, li shunnian <sonofsky2...@gmail.com> wrote:

> I found even in a very simple painter app,  view will refresh whole bounds 
> when switching from another app.

This is expected, when your application is placed in the background, all of the 
backing stores for its views are discarded to save memory.

> 
> --
> Shunnian
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David Duncan


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