带有搜索栏的导航栏不会显示大标题

Question

I have a UISplitViewController with a UINavigationController as the masterviewcontroller. This UINavigationController has a UICollectionViewController as its rootViewController. In the UICollectionViewController , I have set the following parameters:

self.collectionView.scrollEnabled = YES;
self.collectionView.bounces = YES;
self.collectionView.alwaysBounceVertical = YES;
self.navigationController.navigationBar.prefersLargeTitles = YES;

UISearchController *sc = [[UISearchController alloc] initWithSearchResultsController:nil];
self.navigationItem.searchController = sc;

The UISearchBar does show up in the navigationBar, but when I launch the app the navbar is collapsed to the small title. It's only when I drag the view downwards that the large title and the search bar appear.

Where I expect the view to launch like this

it actually launches like this

Any ideas what could be causing this?

Answer 1

Make sure you set preferLargeTitles to true in your UINavigationBar; either in code or in the Storyboard file.

Put this in your viewDidLoad.

self.navigationController?.navigationBar.prefersLargeTitles = true