detach react topBar custom components

lib/ios/RNNRootViewController.m

 
 - (UIViewController *)previewingContext:(id<UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location{
 	if (self.previewController) {
-//		RNNRootViewController * vc = (RNNRootViewController*) self.previewController;
-//		[_eventEmitter sendOnNavigationEvent:@"previewContext" params:@{
-//																		@"previewComponentId": vc.componentId,
-//																		@"componentId": self.componentId
-//																		}];
+		//		RNNRootViewController * vc = (RNNRootViewController*) self.previewController;
+		//		[_eventEmitter sendOnNavigationEvent:@"previewContext" params:@{
+		//																		@"previewComponentId": vc.componentId,
+		//																		@"componentId": self.componentId
+		//																		}];
 	}
 	return self.previewController;
 }
 
 - (void)previewingContext:(id<UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit {
 	RNNRootViewController * vc = (RNNRootViewController*) self.previewController;
-//	NSDictionary * params = @{
-//							  @"previewComponentId": vc.componentId,
-//							  @"componentId": self.componentId
-//							  };
+	//	NSDictionary * params = @{
+	//							  @"previewComponentId": vc.componentId,
+	//							  @"componentId": self.componentId
+	//							  };
 	if (vc.options.preview.commit) {
-//		[_eventEmitter sendOnNavigationEvent:@"previewCommit" params:params];
+		//		[_eventEmitter sendOnNavigationEvent:@"previewCommit" params:params];
 		[self.navigationController pushViewController:vc animated:false];
 	} else {
-//		[_eventEmitter sendOnNavigationEvent:@"previewDismissed" params:params];
+		//		[_eventEmitter sendOnNavigationEvent:@"previewDismissed" params:params];
 	}
 }
 
 	[[NSNotificationCenter defaultCenter] removeObserver:self];
 	[[NSNotificationCenter defaultCenter] removeObserver:self.view];
 	self.view = nil;
+	self.navigationItem.titleView = nil;
+	_customTopBar = nil;
+	_customTitleView = nil;
+	_customTopBarBackground = nil;
 }
 
 @end