ViewWillAppear not being called on main view UISplitViewController

I have a splitvew controller (set in storyboard) with master and details and I set preferredDisplayMode as UISplitViewControllerDisplayModeAllVisible

in master viewController.

I have this method on my main view controller:

- (void) viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

//This is called

}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

 //This is not called

    [self.searchController.searchBar sizeToFit];

    [self configNavBar]; //Adds few buttons to the nav bar

}

      

        
        
        
      

    

I am wondering why viewwillAppear

viewDidLoad, viewDidAppear are not called here but are called. A breakpoint was not hit in viewWillAppear.

If I set my preferred display mode to UISplitViewControllerDisplayModePrimaryOverlay

then viewWillAppear will be called. But here, the detail view controller doesn't take up half the screen.