> 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/xamarin/guides/viewer-components/outline-i.md).

# Display outlines & bookmarks in Xamarin

Learn how to implement a document outline in Xamarin.iOS using PTOutlineViewController class. Navigate through PDF documents with ease and enhance user experience. Add the Tools library to your projec

{% hint style="info" %}
**This tutorial only applies to Xamarin.iOS. See Xamarin.Android equivalent here .**
{% endhint %}

A document outline, or table of contents, demonstrates how the PDF document is organized and helps users see the overall picture. The [`PTOutlineViewController`](https://sdk.apryse.com/api/xamarinios/tools/api/pdftron.PDF.Controls.PTOutlineViewController.html) class shows the document outline (table of contents) that can be used to navigate through the document being viewed by a [`PTPDFViewCtrl`](https://sdk.apryse.com/api/xamarinios/tools/api/pdftron.PDF.PDFViewCtrl.html) by tapping on a bookmark item.

![](https://653871032-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgjsBtuYmcKhWOdM9VCg4%2Fuploads%2Fgit-blob-9acb375f71cdbf76d2250227df451bef01effd66%2Fa400d02a39898855332fc3a1d2b17effe42eb9a7-1242x2208.png?alt=media)

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

## Show an outline view controller

To create a new outline view controller instance and display it from another view controller, supply a `PTPDFViewCtrl` instance to the `PTOutlineViewController` designated initializer:

{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}

```csharp
var outlineViewController = new pdftron.PDF.Controls.PTOutlineViewController (mPdfViewCtrl);
outlineViewController.OutlineViewControllerOutlineSelected += (sender, e) => {
  // perform custom action
    this.DismissViewController (true, null);
};
outlineViewController.OutlineViewControllerDidCancel += (object sender, EventArgs e) => {
  this.DismissViewController (true, null);
};

var navigationController = new UINavigationController (outlineViewController);

if (UserInterfaceIdiomIsPad)
{
    navigationController.ModalPresentationStyle = UIModalPresentationStyle.Popover;
    navigationController.PopoverPresentationController.BarButtonItem = outlineButton;
}

this.PresentViewController (navigationController, true, null);
```

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

{% hint style="info" %}
**The outline view controller must be pushed onto a navigation controller's stack before being shown.**
{% endhint %}

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

The outline view controller is designed to be presented in a popover on iPads. To do so, you must provide the `PTOutlineViewController`'s [`PopoverPresentationController`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller) with either:

* a [`SourceRect`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller.sourcerect#UIKit_UIPopoverPresentationController_SourceRect) AND
* a [`SourceView`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller.sourceview#UIKit_UIPopoverPresentationController_SourceView)

OR

* a [`BarButtonItem`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller.barbuttonitem#UIKit_UIPopoverPresentationController_BarButtonItem)

as in the example above.
{% endhint %}

You can set a delegate to be notified by the outline view controller when outline bookmarks are selected with the `PTOutlineViewControllerDelegate` protocol. (See the CompleteReader example for usage of an `PTOutlineViewController`.)


---

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