listening for programmatic change of view controller in UITabBarController

Question

I need a tabbed application to switch from view controller 2 to view controller 1 (home view controller) and then immediately call a method on view controller 1, without any input from the user. Using viewDidLoad doesn't work, since (as far as I can tell) the home view controller stays loaded the whole time; making it visible doesn't load it again. I've been trying to use -(void)tabBarController: didSelectViewController: but it's not getting called either, I assume because it only works with user-initiated selections, not programmatic selections.

So what can I do?

CainaSouza · Accepted Answer · 2012-12-07 16:06:05Z

2

You can use the method -(void) viewWillAppear to do this. Once the view is already loaded, you do whatever you want when it appear! Here it is:

- (void) viewWillAppear:(BOOL)animated {
   [super viewWillAppear:animated];
   // You code here to update the view.
}

edited Dec 7, 2012 at 16:06

answered Dec 7, 2012 at 15:52

CainaSouza

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2 Comments

Joel Derfner Over a year ago

Hmm. I just tried this in both view controller 1 and view controller 2, but the methods I put in it aren't getting called. I'm sure I'm misunderstanding--would you mind being more explicit about how I do this? Sorry for not getting it.

CainaSouza Over a year ago

I edited my answer above! Check it out and test it! You can also include something like NSLog("Method being called when viewcontroller 1/2 appear") to check if this method is being called.

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