View Controller containment is broken

[ankorko]

UIViewController lifecycle events (view[Will | Did][Load | Appear | Disappear]) should not be sent manually but handled with the View Controller Containment API (willMoveToParentViewController, addChildViewController, didMoveToParentViewController)

[mengjang]

+1 Lifecycycle events should not be set manually. Otherwise, say, ViewDidLoad would be called twice. The funny thing is that if I just comment out the following line, the screen will go black.
// [self notifyControllers:NSSelectorFromString(@"viewDidLoad")
object:nil
checkIndex:NO];

If I comment out everything in notifyControllers, my app works fine with everything rendered on the screen properly.

-(void)notifyControllers:(SEL)selector object:(id)object checkIndex:(BOOL)index{
// if(index && self.childViewControllers.count > self.indexSelected) {
// [(UIViewController_)self.childViewControllers[self.indexSelected] performSelectorOnMainThread:selector
// withObject:object
// waitUntilDone:NO];
// }
// else{
// [self.childViewControllers enumerateObjectsUsingBlock:^(UIViewController_ ctr, NSUInteger idx, BOOL *stop) {
// [ctr performSelectorOnMainThread:selector
// withObject:object
// waitUntilDone:NO];
// }];
// }
}