Prevent navBar header background transition in modals, fixes black background in modals navBar

ios/RCCViewController.m

@@ -535,7 +535,7 @@ const NSInteger TRANSPARENT_NAVBAR_TAG = 78264803;
         }
     };
     
-    if (!self.transitionCoordinator || self.transitionCoordinator.initiallyInteractive || !navBarTransparentBool || appeared) {
+    if (!self.transitionCoordinator || self.transitionCoordinator.initiallyInteractive || !navBarTransparentBool || appeared || [self isModal]) {
         action();
     } else {
         UIView* backgroundView = [self.navigationController.navigationBar valueForKey:@"backgroundView"];
@@ -641,6 +641,17 @@ const NSInteger TRANSPARENT_NAVBAR_TAG = 78264803;
 #endif
 }
 
+- (BOOL)isModal {
+    if([self presentingViewController])
+        return YES;
+    if([[[self navigationController] presentingViewController] presentedViewController] == [self navigationController])
+        return YES;
+    if([[[self tabBarController] presentingViewController] isKindOfClass:[UITabBarController class]])
+        return YES;
+    
+    return NO;
+}
+
 -(void)processTitleView:(UIViewController*)viewController
                   props:(NSDictionary*)props
                   style:(NSDictionary*)style {