Update navigation bar appearance in SearchViewController

Mastodon/Scene/Search/Search/SearchViewController.swift

@@ -85,6 +85,7 @@ extension SearchViewController {
         title = L10n.Scene.Search.title
 
         setupSearchBar()
+        setupNavigationBarAppearance()
         
 //        collectionView.translatesAutoresizingMaskIntoConstraints = false
 //        view.addSubview(collectionView)
@@ -113,6 +114,7 @@ extension SearchViewController {
         ])
 
 //        discoveryViewController.view.isHidden = true
+
     }
 
     override func viewDidAppear(_ animated: Bool) {
@@ -164,6 +166,20 @@ extension SearchViewController {
             .store(in: &disposeBag)
     }
 
+    private func setupNavigationBarAppearance() {
+        let appearance = UINavigationBarAppearance()
+        appearance.configureWithOpaqueBackground()
+        appearance.shadowColor = nil
+
+        navigationItem.standardAppearance = appearance
+        navigationItem.scrollEdgeAppearance = appearance
+        navigationItem.compactAppearance = appearance
+
+        if #available(iOS 15, *) {
+            navigationItem.compactScrollEdgeAppearance = appearance
+        }
+    }
+
 }
 
 // MARK: - UISearchBarDelegate