iphone application crashes frequently with memory warning

I am developing an application for ipad which is dealing with image views, bitmap context, creating image from bitmap contet, video player, audio player, recording,picker views, table views and so on. The application is crashing with memory warning after some time. I am getting that the application exited with signal 9. But it is not entering in did receive memory wa开发者_Go百科rning delegate. then how can i know that it is recieving a memory warning.

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