How to sync the data with web server once device came into network? [closed]

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In my app which is data collection app i need offline support. Let's say when i am gathering user's data there is no connection on device but once the device comes in network the whole data should automatically goes to the server. How should i implement this kind of functionality.

Thanks,

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Your question is pretty vague, but I assume you're wondering HOW to persist data and not how to automatically send it to the server.

If the data is very simple, NSUserDefaults may suffice.

If you need a bit more complicated data structures, you can use archives.

If you need to store complex object graphs you need to use Core Data.

There's a pretty good guide explaining all of these here.