The UIViewController
docs are pretty clear on when and when not to call willMove
/didMove
methods. Check out the “Implementing a Container View Controller” documentation.
The docs say, that if you do not override addChildViewController
, you do not have to call willMoveToParentViewController:
method. However you do need to call the didMoveToParentViewController:
method after the transition is complete. “Likewise, it is is the responsibility of the container view controller to call the willMoveToParentViewController:
method before calling the removeFromParentViewController
method. The removeFromParentViewController
method calls the didMoveToParentViewController:
method of the child view controller.”
Also, there is an example worked out here and sample code here.
Good Luck