---
title: trackIDs
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avassettrackgroup/trackids
---

# trackIDs

The IDs of the tracks in the group.

## Declaration

```swift
var trackIDs: [NSNumber] { get }
```

## Discussion

Discussion The value of this property is an array of NSNumber instances used as CMPersistentTrackID values, one for each track in the group.