---
title: navigationMarkerGroups
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avplayeritem/navigationmarkergroups
---

# navigationMarkerGroups

The time marker groups that provide ways to navigate the player item’s content.

## Declaration

```swift
var navigationMarkerGroups: [AVNavigationMarkersGroup] { get set }
```

## Discussion

Discussion A navigation marker group provides a set of time markers for navigating playback. The most common form of navigation marker group is a chapter list; however, you can also provide other sets of markers to allow a user to jump to significant events in the presentation. For example, a “Goals Scored” marker group might summarize key moments in a recorded sporting event. When you present a player item containing marker groups with the AVPlayerViewController class, the user interface provides options for navigating each group. To provide a chapter list, use the first item in the navigationMarkerGroups array and set its title property to nil. To provide additional or alternate means of navigating content, use a unique title value for each navigation marker group in the array.

## See Also

### Configuring player items for AVKit

- [nextContentProposal](avfoundation/avplayeritem/nextcontentproposal.md)