---
title: uid
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudiosessionportdescription/uid
---

# uid

A system-assigned unique identifier (UID) for the port.

## Declaration

```swift
var uid: String { get }
```

## Discussion

Discussion The value of this property matches that of the owningPortUID property of every AVAudioSessionChannelDescription object in the port’s channels array.

## See Also

### Getting the Port Attributes

- [portName](avfaudio/avaudiosessionportdescription/portname.md)
- [portType](avfaudio/avaudiosessionportdescription/porttype.md)
- [AVAudioSession.Port](avfaudio/avaudiosession/port.md)
- [channels](avfaudio/avaudiosessionportdescription/channels.md)
- [AVAudioSessionChannelDescription](avfaudio/avaudiosessionchanneldescription.md)
- [hasHardwareVoiceCallProcessing](avfaudio/avaudiosessionportdescription/hashardwarevoicecallprocessing.md)
- [isSpatialAudioEnabled](avfaudio/avaudiosessionportdescription/isspatialaudioenabled.md)