viewWillAppear Event

[cSilas]

Hello,

In first you project is very cool! Nice Job!

I have a question. How can i detect the viewWillAppear method for each ViewController ? I need to catch the event.

Your project is not update for the iOS 7 ?

Thank you.
Regards.

[CrescentFresh]

DAPagesContainer's mechanism of adding a child view controller does cause viewWillAppear to not get called on the child view controller.

I've investigated the cause of this (iOS 6) and it appears to be in setViewControllers whereby it calls

[viewController willMoveToParentViewController:self];

Whereas according to apple's documentation it should be:

[self addChildViewController:viewController];

(which incidentally automatically calls willMoveToParentViewController).

When I changed the above line, the viewWillAppear method of my child view controllers does get called.

[cSilas]

Thank you for your answer!
But i'm trying to modify my code with your help but it's the same. All the viewWillAppear, viewDidAppear, etc.. methods are called when the differents views are instantiates!
But when i navigate between the differents ViewControllers, the methods are never call! Do you know how can i resolved it ?

[CrescentFresh]

Oh that's by design (with the way DAPagesContainer is currently implemented). All your viewControllers are presented at the same time (inside a UIScrollView), the trick being the non visible ones are outside of the scrollView's visible area. But as far as the UIViewController life cycle, they have "appeared".

It isn't a problem is it? For the most part it works. Where it might get tricky is if you are waiting to do something (eg load dynamic content) until the very moment the view controller is slid into view. In such a case DAPagesContainer might not be the most appropriate tool for the job? Not sure...

[tunbeo]

Add your child Controllers directly in DAPagesContainer in ViewDidLoad.
self.viewControllers = @[vc1, vc2];
[self addChildViewController:vc1];
[self addChildViewController:vc2];

and dynamic UIViewControllers works. (then you don't need DAViewController anymore)