send application delegate message to current view without notification center

Question

I want to display application delegate message such as "Application became active" (This is called when -applicationDidBecomeActive:application is called) on Window.

One way is to use notification center like below:

AppDelegate.m

NSNotification *n = [NSNotification notificationWithName:@"AppBecameActive" object:self];
[[NSNotificationCenter defaultCenter] postNotification:n];

ViewController.m

NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:@selector(showMessageAppBecameActive) name:@"AppBecameActive" object:nil];

This way is only way to show application delegate message ? Or, is there any other way such as property to look current view controller instance ?

Thank you for your kindness.

I don't want to use **notification center** because it make code complex. If there is some way such as some property to use, I want to use it. — Feel Physics, Aug 27 '12 at 03:55
My take is that in the general case, using properties will make your code far more complex than using `NSNotificationCenter`. But you could always add a `ViewController` property to `AppDelegate` and send it a message directly. — Carl Veazey, Aug 27 '12 at 05:06

score 0 · Answer 1 · answered Mar 18 '14 at 07:18

If you have access to the ViewController from your appDelegate. (I mean like @property or instance is reside in it) you can straight away send a message. If you do not have such access to it. write key value observer for a single ton and let your viewController receive the change.

score -1 · Answer 2 · answered Aug 27 '12 at 04:40

Register below code in your viewController which wants notification.

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

iOS framework posts a notification when your app become active, if you will register via above way, you can handle the notification in registered method (In this case yourMethod).

send application delegate message to current view without notification center

2 Answers2