Question

So I have around 4 viewcontrollers in this iPAd App that I am testing. Before the Application becomes inactive, the TableViewController is presnet. Once I press the button on the iPhone, it will initiate

-(void)applicationWillResignActive:(UIApplication *)application  

And when I start it again, I want the application to resume with the process, with the loaded table and show the ‘Screen’ that was available before I pressed the Button.

I can understand that

-(void)applicationDidBecomeActive:(UIApplication *)application   

is involved in this event. Could you tell me how I can actually bring a particular view controller on the event of resuming the process ??

Thanks.

Answer 1

You can register your own UIViewControllers as observers for `UIApplicationDidBecomeActiveNotification.

In your view controllers:

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(applicationDidBecomeActive:) 
                                             name:UIApplicationDidBecomeActiveNotification 
                                           object:nil];

Do not forget to remove them as observers in their dealloc methods:

- (void)dealloc {
    ...
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
    [super dealloc];   
}