ios - Terminated due to Memory Pressure with less then 15MB used -

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i'm facing strange problem, app i'm working on it's killed due memory pressure it's not using can see in screenshoot.
i'm started "other" issues memory leaks, implicit casting, don't know how debug kind of things, so... know how out of problem ? :)

enter image description here

typically termination due memory pressure occurs when app suspended ios itself. happens when device doesn't have lot of free memory , sign (meaning happen app sooner or later when user closes it).

i offer use instruments , find app terminate (if case). instruments tutorial can found here - http://www.raywenderlich.com/23037/how-to-use-instruments-in-xcode


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