Question

I have an application with tab bar and 3 different View Controller. one of these imanage a UItableView that I designed through Interface Builder (storyboard) and I set the it’s view controller class in the Inspector -> inspector identity -> and I set class field there, hence, I have no control when this view controller get instantiated, as it’s done through storyboard when user click on tab bar. notice, i’m new to objective C and iOS programming.

the issue that I’m facing, i’m also using remote notification. hence, when I receive a remote notification message in “didReceiveRemoteNotification” in the AppDelgate class. I need to update UI interface (above ViewController), but the issue I don’t have a reference (pointer) to this ViewController from my AppDelgate class ( or do I?). the problem this ViewController instantiated by storyboard nor programmatically, otherwise I could have kept a reference to it.

I did some reading and I understand I could do this communication via NSNotification, but I think this will be an overkill for a problem that maybe arise just because I’m new to this and I don’t have full understanding of iOS development.

Thanks,

Answer 1

Your app Delegate will have a window property which points to the apps window.

Window Property has a -rootViewController property/method.

For your Tab Based Application it would return you the TabViewController.

Each TabViewController have a method -(NSArray *)viewControllers which returns the ViewControllers inside the Tab. These are arranged in the order.

To Access your applications AppDelegate use [[UIApplication sharedApplication]delegate]

Once you have these viewcontrollers you would know which all viewController these are since you have added it in the XIB files. and can perform your methods