show navbar for photo/album picker, not approval

Signal/src/ViewControllers/MediaGalleryViewController.swift

@@ -291,11 +291,7 @@ class MediaGalleryNavigationController: OWSNavigationController {
             return
         }
 
-        navigationBar.respectsTheme = false
+        navigationBar.overrideTheme(type: .alwaysDark)
-        navigationBar.barStyle = .black
-        navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: Theme.darkThemePrimaryColor]
-        navigationBar.barTintColor = Theme.darkThemeBackgroundColor.withAlphaComponent(0.6)
-        navigationBar.tintColor = Theme.darkThemePrimaryColor
     }
 
     override func viewDidAppear(_ animated: Bool) {

Signal/src/ViewControllers/PhotoLibrary/ImagePickerController.swift

@@ -59,12 +59,6 @@ class ImagePickerGridController: UICollectionViewController, PhotoLibraryDelegat
 
         view.backgroundColor = .ows_gray95
 
-        if let navBar = self.navigationController?.navigationBar as? OWSNavigationBar {
-            navBar.makeClear()
-        } else {
-            owsFailDebug("Invalid nav bar.")
-        }
-
         let cancelButton = UIBarButtonItem(barButtonSystemItem: .stop,
                                            target: self,
                                            action: #selector(didPressCancel))
@@ -107,6 +101,12 @@ class ImagePickerGridController: UICollectionViewController, PhotoLibraryDelegat
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
 
+        if let navBar = self.navigationController?.navigationBar as? OWSNavigationBar {
+            navBar.overrideTheme(type: .alwaysDark)
+        } else {
+            owsFailDebug("Invalid nav bar.")
+        }
+
         // Determine the size of the thumbnails to request
         let scale = UIScreen.main.scale
         let cellSize = collectionViewFlowLayout.itemSize

Signal/src/ViewControllers/PhotoLibrary/PhotoCollectionPickerController.swift

@@ -39,12 +39,6 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
 
         view.backgroundColor = .ows_gray95
 
-        if let navBar = self.navigationController?.navigationBar as? OWSNavigationBar {
-            navBar.makeClear()
-        } else {
-            owsFailDebug("Invalid nav bar.")
-        }
-
         if #available(iOS 11, *) {
             let titleLabel = UILabel()
             titleLabel.text = previousPhotoCollection.localizedTitle()
@@ -77,6 +71,16 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
         updateContents()
     }
 
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+
+        if let navBar = self.navigationController?.navigationBar as? OWSNavigationBar {
+            navBar.overrideTheme(type: .alwaysDark)
+        } else {
+            owsFailDebug("Invalid nav bar.")
+        }
+    }
+
     private func updateContents() {
         photoCollections = library.allPhotoCollections()
 

SignalMessaging/ViewControllers/AttachmentApprovalViewController.swift

@@ -145,7 +145,7 @@ public class AttachmentApprovalViewController: UIPageViewController, UIPageViewC
             owsFailDebug("navigationBar was nil or unexpected class")
             return navController
         }
-        navigationBar.makeClear()
+        navigationBar.overrideTheme(type: .clear)
 
         return navController
     }
@@ -247,6 +247,12 @@ public class AttachmentApprovalViewController: UIPageViewController, UIPageViewC
         super.viewWillAppear(animated)
 
         CurrentAppContext().setStatusBarHidden(true, animated: animated)
+
+        guard let navigationBar = navigationController?.navigationBar as? OWSNavigationBar else {
+            owsFailDebug("navigationBar was nil or unexpected class")
+            return
+        }
+        navigationBar.overrideTheme(type: .clear)
     }
 
     override public func viewDidAppear(_ animated: Bool) {

SignalMessaging/Views/OWSNavigationBar.swift

@@ -59,14 +59,11 @@ public class OWSNavigationBar: UINavigationBar {
 
     private func applyTheme() {
         guard respectsTheme else {
-            removeBlurEffectView()
-
-            self.setBackgroundImage(nil, for: .default)
             return
         }
 
         if UIAccessibilityIsReduceTransparencyEnabled() {
-            removeBlurEffectView()
+            blurEffectView?.isHidden = true
             let color = Theme.navbarBackgroundColor
             let backgroundImage = UIImage(color: color)
             self.setBackgroundImage(backgroundImage, for: .default)
@@ -189,38 +186,37 @@ public class OWSNavigationBar: UINavigationBar {
         }
     }
 
-    // MARK: 
+    // MARK: Override Theme
 
     @objc
-    public func makeClear() {
+    public enum NavigationBarThemeOverride: Int {
-        self.backgroundColor = .clear
+        case clear, alwaysDark
-        // Making a toolbar transparent requires setting an empty uiimage
-        self.setBackgroundImage(UIImage(), for: .default)
-        self.shadowImage = UIImage()
-        self.clipsToBounds = true
-        removeBlurEffectView()
     }
 
-    // MARK:
+    @objc
-
+    public func overrideTheme(type: NavigationBarThemeOverride) {
-    private func removeBlurEffectView() {
+        respectsTheme = false
-        // Avoid crash on iOS 10.3.3 and iOS 9.4.
+
-        //
+        barStyle = .black
-        // Last Exception Backtrace:
+        titleTextAttributes = [NSAttributedStringKey.foregroundColor: Theme.darkThemePrimaryColor]
-        // 0   CoreFoundation                    0x1b6bfb38 __exceptionPreprocess + 124 (NSException.m:165)
+        barTintColor = Theme.darkThemeBackgroundColor.withAlphaComponent(0.6)
-        // 1   libobjc.A.dylib                   0x1a947062 objc_exception_throw + 34 (objc-exception.mm:521)
+        tintColor = Theme.darkThemePrimaryColor
-        // 2   CoreFoundation                    0x1b6bfa80 +[NSException raise:format:] + 104 (NSException.m:140)
+
-        // 3   UIKit                             0x20bfc9fe -[UINavigationBar removeConstraint:] + 84 (UINavigationBar.m:4618)
+        switch type {
-        // 4   UIKit                             0x208ee3d4 _UIViewRemoveConstraintsMadeDanglyByChangingSuperview + 534 // (NSLayoutConstraint_UIKitAdditions.m:4716)
+        case .clear:
-        // 5   UIKit                             0x208ede90 __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 40 // (UIView.m:9467)
+            blurEffectView?.isHidden = true
-        // 6   UIKit                             0x208edd6c -[UIView(Hierarchy) _postMovedFromSuperview:] + 710 (UIView.m:361)
+            clipsToBounds = true
-        // 7   UIKit                             0x20bd19e8 __UIViewWasRemovedFromSuperview + 154 (UIView.m:8889)
+
-        // 8   UIKit                             0x208ecf6a -[UIView(Hierarchy) removeFromSuperview] + 528 (UIView.m:8961)
+            // Making a toolbar transparent requires setting an empty uiimage
-        // 9   SignalMessaging                   0x1d42b64 OWSNavigationBar.applyTheme() + 218 (OWSNavigationBar.swift:62)
+            setBackgroundImage(UIImage(), for: .default)
-        if #available(iOS 11, *) {
+            shadowImage = UIImage()
-            self.blurEffectView?.removeFromSuperview()
+            backgroundColor = .clear
-        } else {
+        case .alwaysDark:
-            self.blurEffectView?.isHidden = true
+            blurEffectView?.isHidden = false
+            clipsToBounds = false
+
+            setBackgroundImage(nil, for: .default)
+            shadowImage = nil
         }
     }
 }