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I have developed an application. My application takes feedback from users. When network is not available, then that data is saved in local db. But, once the network is available, it will sync automatically with the central database.
But, I have some problem here. If I save database & send my application to background, once the network is available, it has to automatically do this syncing with the central database. How to do that?
I am using Reachability class to check network availability.
At the present time there is no way to have your app “wake up” when the network becomes available. If the user quit your app without a network connection, you cannot do anything until they voluntarily open your app.
However, you can prompt them to do so using UILocalNotification. If your app is being quit and you have some data waiting to be uploaded, you can schedule a notification to fire in 4 hours (or whatever amount of time makes sense).
If the user opens the app before the notification time and you are able to upload the data, you can cancel the notification and no one will ever know it was scheduled.
If the user does not open the app, the notification will appear, and say something like, “You have data on your phone that you have not uploaded in a while. Connect to the Internet and launch MyAwesomeApp to sync your data.”