objective c - Cache a JSON string from a URL Request -

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i have 3 different requests made url retrieve extensive json string. store in cache in event iphone not have internet connection @ next launch.

what best method this? new objective-c , xcode. have researched nsurlcache , nscache, not sure should use.

i know if there way preload json string in background. or @ least show preloader view. 2 separate questions, know.

thanks pointing me in right direction.


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