things working

Signal/src/ViewControllers/MediaGalleryViewController.swift

@@ -168,6 +168,7 @@ protocol MediaGalleryDataSourceDelegate: class {
     func mediaGalleryDataSource(_ mediaGalleryDataSource: MediaGalleryDataSource, deletedSections: IndexSet, deletedItems: [IndexPath])
 }
 
+@objc
 class MediaGalleryViewController: OWSNavigationController, MediaGalleryDataSource, MediaTileViewControllerDelegate {
 
     private var pageViewController: MediaPageViewController?
@@ -197,7 +198,9 @@ class MediaGalleryViewController: OWSNavigationController, MediaGalleryDataSourc
 
         self.options = options
         self.mediaGalleryFinder = OWSMediaGalleryFinder(thread: thread)
-        super.init(owsNavigationBar: ())
+        super.init(nibName: nil, bundle: nil)
+        self.setValue(OWSNavigationBar(), forKey: "navigationBar")
+        super.setupNavbar()
     }
 
     required init?(coder aDecoder: NSCoder) {

SignalMessaging/ViewControllers/OWSNavigationController.h

@@ -23,7 +23,8 @@ NS_ASSUME_NONNULL_BEGIN
 // unsaved changes.
 @interface OWSNavigationController : UINavigationController
 
-- (instancetype)initWithOWSNavigationBar;
+- (instancetype)init;
+- (void)setupNavbar;
 
 @end
 

SignalMessaging/ViewControllers/OWSNavigationController.m

@@ -24,33 +24,20 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSNavigationController
 
-- (instancetype)initWithOWSNavigationBar
+- (instancetype)init
 {
-    self = [self initWithNavigationBarClass:[OWSNavigationBar class] toolbarClass:nil];
+    self = [super initWithNavigationBarClass:[OWSNavigationBar class] toolbarClass:nil];
     if (!self) {
         return self;
     }
-
-    if (![self.navigationBar isKindOfClass:[OWSNavigationBar class]]) {
-        OWSFailDebug(@"navigationBar was unexpected class: %@", self.navigationBar);
-        return self;
-    }
-
-    OWSNavigationBar *navbar = (OWSNavigationBar *)self.navigationBar;
-    navbar.navBarLayoutDelegate = self;
-    [self updateLayoutForNavbar:navbar];
-
-    [[NSNotificationCenter defaultCenter] addObserver:self
-                                             selector:@selector(themeDidChange:)
-                                                 name:ThemeDidChangeNotification
-                                               object:nil];
+    [self setupNavbar];
 
     return self;
 }
 
 - (instancetype)initWithRootViewController:(UIViewController *)rootViewController
 {
-    self = [self initWithOWSNavigationBar];
+    self = [self init];
     if (!self) {
         return self;
     }
@@ -64,6 +51,8 @@ NS_ASSUME_NONNULL_BEGIN
     [[NSNotificationCenter defaultCenter] removeObserver:self];
 }
 
+#pragma mark -
+
 - (void)themeDidChange:(NSNotification *)notification
 {
     OWSAssertIsOnMainThread();
@@ -82,6 +71,22 @@ NS_ASSUME_NONNULL_BEGIN
 
 #pragma mark - UINavigationBarDelegate
 
+- (void)setupNavbar
+{
+    if (![self.navigationBar isKindOfClass:[OWSNavigationBar class]]) {
+        OWSFailDebug(@"navigationBar was unexpected class: %@", self.navigationBar);
+        return;
+    }
+    OWSNavigationBar *navbar = (OWSNavigationBar *)self.navigationBar;
+    navbar.navBarLayoutDelegate = self;
+    [self updateLayoutForNavbar:navbar];
+
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(themeDidChange:)
+                                                 name:ThemeDidChangeNotification
+                                               object:nil];
+}
+
 // All OWSNavigationController serve as the UINavigationBarDelegate for their navbar.
 // We override shouldPopItem: in order to cancel some back button presses - for example,
 // if a view has unsaved changes.