[iOS] Decouple top app nav bar visibility from annotation toolbar visibility

ios/Classes/PTFlutterDocumentController.m

@@ -140,7 +140,7 @@ - (void)didOpenDocument
 
 - (BOOL)isTopToolbarEnabled
 {
-    return (!self.topAppNavBarHidden && !self.topToolbarsHidden);
+    return !self.topToolbarsHidden;
 }
 
 - (BOOL)areTopToolbarsEnabled
@@ -157,6 +157,9 @@ - (BOOL)controlsHidden
 {
     if (self.navigationController) {
         if ([self isTopToolbarEnabled]) {
+            if (![self isNavigationBarEnabled]) {
+                return NO;
+            }
             return [self.navigationController isNavigationBarHidden];
         }
         if ([self isBottomToolbarEnabled]) {
@@ -1031,10 +1034,12 @@ - (void)applyViewerSettings
     }
     self.toolManager.pencilTool = self.useStylusAsPen ? pencilTool : [PTPanTool class];
 
-    const BOOL hideNav = (self.topAppNavBarHidden || self.topToolbarsHidden);
-    self.controlsHidden = hideNav;
+    const BOOL hideTopToolbars = self.topToolbarsHidden;
+    self.controlsHidden = hideTopToolbars;
 
-    const BOOL translucent = hideNav;
+    const BOOL hideTopAppNavBar = (self.topAppNavBarHidden || self.topToolbarsHidden);
+    const BOOL translucent = hideTopAppNavBar;
+    [self.navigationController setNavigationBarHidden:hideTopAppNavBar animated:NO];
     self.navigationController.navigationBar.translucent = translucent;
     self.thumbnailSliderController.toolbar.translucent = translucent;
 
@@ -1917,7 +1922,7 @@ - (void)setLeadingNavButtonIcon:(NSString *)leadingNavButtonIcon
 - (BOOL)shouldSetNavigationBarHidden:(BOOL)navigationBarHidden animated:(BOOL)animated
 {
     if (!navigationBarHidden) {
-        return [self isTopToolbarEnabled];
+        return [self isNavigationBarEnabled] && !self.topToolbarsHidden;
     }
     return YES;
 }