Question

In my application i am using XML file from server.

So during start up of application i want to check internet connectivity.

If internet connectivity is not there then i want to show screen which tells user to exit .

How can i implement that.

Answer 1

Import the “Reachability” files from the Apple sample code project and start it up like this:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];
internetReachable = [[Reachability reachabilityForInternetConnection] retain];
[internetReachable startNotifier];

hostReachable = [[Reachability reachabilityWithHostName:@"yourwebsite.com"] retain];
[hostReachable startNotifier];

Then check for internet connection as below. It is very convenient, as you can always check the connection on the fly when you need it.

if ([internetReachable currentReachabilityStatus]==NotReachable ||
    [hostReachable currentReachabilityStatus]==NotReachable) {
    // react appropriately
}

Don’t worry about this slowing you down – it is asynchronous. You can react to the Internet being up or down after making sure the UI does what the user expects.