UIViewController viewWillAppear not called when adding as subView

Question

I have a UIViewController that I am loading from inside another view controller and then adding its view to a UIScrollView.

self.statisticsController = [self.storyboard instantiateViewControllerWithIdentifier:@"StatisticsViewController"]; self.statisticsController.match = self.match;  [self.scrollView addSubview:self.statisticsController.view]; 

I've put breakpoints in the statistics view controller and viewDidLoad is being called but viewWillAppear isn't.

Is it because I'm not pushing it onto the hierarchy or something?

Answer 1

You should add statisticsController as a child view controller of the controller whose view you're adding it to.

self.statisticsController = [self.storyboard instantiateViewControllerWithIdentifier:@"StatisticsViewController"]; self.statisticsController.match = self.match;  [self.scrollView addSubview:self.statisticsController.view]; [self addChildViewController:self.statisticsController]; [self.statisticsController didMoveToParentViewController:self]; 

I'm not sure this will make viewDidAppear get called, but you can override didMoveToParentViewController: in the child controller, and that will be called, so you can put any code that you would have put in viewDidAppear in there.