How do I check for Internet connection or load local file?

Question

I have an app which, from the app delegate, calls a synchronization engine. The synchronization engine fetches data from the web from a web service parses it and puts it in a core data base.

The individual you controllers call a fetch to the core database in order to present the data.

I want to add the feature of checking for Internet connectivity. Should I check for Internet connectivity in the app delegate and if there is one call the sync engine, else if there is not... What do I do, just leave it empty?

If (Internet) {
//call sync engine
} else { 
//do nothing
}

score 1 · Answer 1 · answered Mar 06 '13 at 02:04

1

To check for connectivity, there are a couple of options:

Use Apple's Reachability class. Easy to use, simple but isn't ARC compatible.
Use a 3rd party class that replaces Apple's. This one is good. ARC compatible.

answered Mar 06 '13 at 02:04

LJ Wilson

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Yes I am using reachability. But my question is how to handle using the local file instead of the web fetched file. – marciokoko Mar 06 '13 at 02:20
If you have structured both your local and web fetched file the same, you just need to put a conditional check for "Reachability". And then you can populate your model objects from that file. – Anupdas Mar 06 '13 at 02:28

wigging · Answer 2 · 2013-03-06T04:13:07.837

0

Have you tried reachability? It works something like this:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkChanged:) name:kReachabilityChangedNotification object:nil];

online = [Reachability reachabilityForInternetConnection];
[online startNotifier];

- (void)networkChanged:(NSNotification *)notification {

  NetworkStatus remoteHostStatus = [online currentReachabilityStatus];

  if(remoteHostStatus == NotReachable) { 
      //use local file
  }
  else if (remoteHostStatus == ReachableViaWiFiNetwork) { 
      //use remote file
  }
  else if (remoteHostStatus == ReachableViaCarrierDataNetwork) { 
      //use remote file
  }
}

edited Mar 06 '13 at 04:13

answered Mar 06 '13 at 02:04

wigging

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Yes I am using reachability. But my question is how to handle using the local file instead of the web fetched file. – marciokoko Mar 06 '13 at 02:20
@marciokoko See the edited answer above. Just use the local file when you are not connected to the internet. – wigging Mar 06 '13 at 04:14

How do I check for Internet connection or load local file?

2 Answers2