iOS - when to load external data - ios

Question

In my app delegate I have this:
Reachability* reach = [Reachability reachabilityWithHostname:#"www.google.com"];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(reachabilityChanged:)
name:kReachabilityChangedNotification
object:nil];
[reach startNotifier];
HomeViewController_iPhone *homeViewController = [[HomeViewController_iPhone alloc] initWithNibName:#"HomeViewController_iPhone" bundle:nil];
homeViewController.managedObjectContext = self.managedObjectContext;
UINavigationController *homeNavController = [[UINavigationController alloc] initWithRootViewController: homeViewController];
homeNavController.navigationBar.barStyle = UIBarStyleBlackTranslucent;
self.tabBarController.viewControllers = [NSArray arrayWithObjects:homeNavController, nil];
...
-(void)reachabilityChanged:(NSNotification*)note
{
Reachability * reach = [note object];
if([reach isReachable])
{
NSLog(#"Notification Says Reachable");
self.isConnected = YES;
}
else
{
NSLog(#"Notification Says UN-Reachable");
self.isConnected = NO;
}
}
The problem is that in my HomeViewController (viewDidLoad) I do this:
AppDelegate *appDelegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];
if (appDelegate.isConnected)
{
dispatch_async(kBgQueue, ^{
NSData* data = [NSData dataWithContentsOfURL: kFeedURL];
[self performSelectorOnMainThread:#selector(fetchedData:)
withObject:data waitUntilDone:YES];
});
}
But appDelegate.isConnected is always NO, even when I have a connection. I think the check is being made before the Reachability class establishes that there is a connection. But where to I make the call to fetch the data? I've tried viewDidLoad and viewWillAppear, but isConnected is still NO at both of those points.

Answer 1

Solved by doing this in the app delegate, before creating the view controllers, as in the answer suggested by dnstevenson.
Reachability *reachability = [Reachability reachabilityForInternetConnection];
NetworkStatus internetStatus = [reachability currentReachabilityStatus];
if (internetStatus != NotReachable) {
//my web-dependent code
}
else {
//there-is-no-connection warning
}