Calling methods of view controller from app delegate class

Question

When my app will enter foreground, I need to call some methods of my view controller from the app delegate class. How is the best way to realise it?

I try to create a "fake" notification in "applicationWillEnterForeground" method:

[NSNotificationCenter defaultCenter]postNotificationName:@"test" object:nil];

And add observer in view controller:

[self addObserver: self selector:@selector(testMethod) name:@"test" object:nil];

Which approach is better and why?

PS Sorry for my bad english.

possible duplicate of how to call the method one class to another class in obj c — jscs
– jscs, Commented Feb 12, 2015 at 21:14

LukeSideWalker · Accepted Answer · 2015-02-12 17:15:56Z

0

Quick Answer:

Yes, that should work with your "fake" notification
But why should you do so? You could let your viewController do all the things without die AppDelegate -> just call your methods, that you want to be done in the 'viewDidLoad'-method of your viewController. (I assume, your viewController is the entry point of your App)

answered Feb 12, 2015 at 17:15

LukeSideWalker

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1 Comment

Load-time is not the only time an app will enter foreground.

Community · Accepted Answer · 2017-05-23 11:56:59Z

0

Notification will support many destinations, whereas the answer here only supports one viewController being told what to do.

On the other hand, calling directly through a reference is easier to understand and to debug.

I don't understand why you call it a "fake" notification - this is exactly how that call is meant to be used.

CommunityBot

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answered Feb 13, 2015 at 13:23

Bryan

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