> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/ios/ui-customization/navigation-lists.md).

# List container to customize horizontal menu layout on iOS

Learn how to use the PTNavigationListsViewController class to manage annotation lists, document outlines, and user-defined bookmarks with a UITabBarController-like interface. Customize your navigation

The [`PTNavigationListsViewController`](https://sdk.apryse.com/api/ios/Classes/PTNavigationListsViewController.html) class is a container view controller that shows the [annotation list](/ios/annotation/annotation-list-i.md), [document outline](/ios/bookmarks/outline.md), and [user-defined bookmark](/ios/bookmarks/user-bookmarks-i.md) list controls with a `UITabBarController`-like interface. A segmented control is used to select which child view controller to display.

![](https://4149080208-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgY6xtY9ZQd9XMpvWlGM0%2Fuploads%2Fgit-blob-3b4fe3f15304cc68df980f8cdd4bc58c4130a6d3%2F08935ed43ed617260c9ad07c1e040c5114e3ba47-1242x2208.png?alt=media)

*The navigation lists control is part of the Tools library, so make sure you have* [*added the Tools library to your project*](/ios/ui-customization/setup.md)*.*

## Show a navigation lists view controller

To create a new navigation lists view controller and display it from another view controller, set the child list view controllers to the `PTNavigationListsViewController` class's [`listViewControllers`](https://sdk.apryse.com/api/ios/Classes/PTNavigationListsViewController.html#/c:objc\(cs\)PTNavigationListsViewController\(py\)listViewControllers) property:

{% tabs %}
{% tab title="Swift" %}
{% code lineNumbers="true" %}

```swift
// Initialize a new navigation lists view controller.
let navigationListsViewController = PTNavigationListsViewController(toolManager: toolManager)

// Initialize an annotation, outline, and bookmark view controller with a PTPDFViewCtrl instance.
let annotationViewController = PTAnnotationViewController(pdfViewCtrl: pdfViewCtrl)
annotationViewController.delegate = self

let outlineViewController = PTOutlineViewController(pdfViewCtrl: pdfViewCtrl)
outlineViewController.delegate = self

let bookmarkViewController = PTBookmarkViewController(pdfViewCtrl: pdfViewCtrl)
bookmarkViewController.delegate = self

// Set the array of child view controllers to display.
navigationListsViewController.listViewControllers = [outlineViewController, annotationViewController, bookmarkViewController]

if ( UIDevice.current.userInterfaceIdiom == .pad ) {
    navigationListsViewController.modalPresentationStyle = .popover
    navigationListsViewController.popoverPresentationController?.barButtonItem = navigationListsButton
} else {
    navigationListsViewController.modalPresentationStyle = .fullScreen
}

self.present(navigationListsViewController, animated: true, completion: nil)
```

{% endcode %}
{% endtab %}

{% tab title="Obj-C" %}
{% code lineNumbers="true" %}

```objc
// Initialize a new navigation lists view controller.
PTNavigationListsViewController* navigationListsViewController = [[PTNavigationListsViewController alloc] initWithToolManager:self.toolManager];

// Initialize an annotation, outline, and bookmark view controller with a PTPDFViewCtrl instance.
PTAnnotationViewController* annotationViewController = [[PTAnnotationViewController alloc] initWithPDFViewCtrl:self.pdfViewCtrl];
annotationViewController.delegate = self;

PTOutlineViewController *outlineViewController = [[PTOutlineViewController alloc] initWithPDFViewCtrl:self.pdfViewCtrl];
outlineViewController.delegate = self;

PTBookmarkViewController *bookmarkViewController = [[PTBookmarkViewController alloc] initWithPDFViewCtrl:self.pdfViewCtrl];
bookmarkViewController.delegate = self;

// Set the array of child view controllers to display.
navigationListsViewController.listViewControllers = @[outlineViewController, annotationViewController, bookmarkViewController];

if (self.traitCollection.userInterfaceIdiom == UIUserInterfaceIdiomPad) {
        selfnavigationListsViewController.modalPresentationStyle = UIModalPresentationPopover;
        UIPopoverPresentationController *popoverController = navigationListsViewController.popoverPresentationController;
        popoverController.barButtonItem = self.navigationListsButton;
} else {
        navigationListsViewController.modalPresentationStyle = UIModalPresentationFullScreen;
}
[self presentViewController:navigationListsViewController animated:YES completion:nil];
```

{% endcode %}
{% endtab %}
{% endtabs %}

{% hint style="info" %}
**Presenting on iPads:**

The navigation list view controller is designed to be presented in a popover on iPads. To do so, you must provide the `PTNavigationListsViewController`'s [`UIPopoverPresentationController`](https://developer.apple.com/uikit/uipopoverpresentationcontroller/) with either:

* a [`sourceRect`](https://developer.apple.com/uikit/uipopoverpresentationcontroller/1622324-sourcerect/) AND
* a [`sourceView`](https://developer.apple.com/uikit/uipopoverpresentationcontroller/1622313-sourceview/)

OR

* a [`barButtonItem`](https://developer.apple.com/uikit/uipopoverpresentationcontroller/1622314-barbuttonitem/)

as in the example above.
{% endhint %}

## Customization

The `PTNavigationListViewController` provides a flexible API for displaying only the desired child view controllers. Any of the annotation list, document outline, or user-defined bookmark list view controllers can be removed by omitting them from the `listViewControllers` property. It is also possible to add a custom child view controller by adding it to the `listViewControllers` array.

To specify which of the child view controllers to display on opening the navigation list control, either the [`selectedIndex`](https://sdk.apryse.com/api/ios/Classes/PTNavigationListsViewController.html#/c:objc\(cs\)PTNavigationListsViewController\(py\)selectedIndex) , or the [`selectedViewController`](https://sdk.apryse.com/api/ios/Classes/PTNavigationListsViewController.html#/c:objc\(cs\)PTNavigationListsViewController\(py\)selectedViewController) property can be used.

{% tabs %}
{% tab title="Swift" %}
{% code lineNumbers="true" %}

```swift
// Add a custom view controller to an existing navigation list control
let customViewController = UIViewController()
navigationListsViewController.listViewControllers?.append(customViewController)

// Show the navigationListsViewController's annotationViewController on opening
navigationListsViewController.selectedViewController = navigationListsViewController.annotationViewController
// OR specify an index to show from the `listViewControllers` property
navigationListsViewController.selectedIndex = 0
```

{% endcode %}
{% endtab %}

{% tab title="Obj-C" %}
{% code lineNumbers="true" %}

```objc
// Add a custom view controller to an existing navigation list control
UIViewController *customViewController = [[UIViewController alloc] init];
navigationListsViewController.listViewControllers = [navigationListsViewController.listViewControllers arrayByAddingObject:customViewController];

// Show the navigationListsViewController's annotationViewController on opening
navigationListsViewController.selectedViewController = navigationListsViewController.annotationViewController;
// OR specify an index to show from the `listViewControllers` property
navigationListsViewController.selectedIndex = 0;
```

{% endcode %}
{% endtab %}
{% endtabs %}


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