---
title: extensionIdentifier
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmediaextensionproperties/extensionidentifier
---

# extensionIdentifier

## Declaration

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

## See Also

### Inspecting the extension

- [extensionName](avfoundation/avmediaextensionproperties/extensionname.md)
- [containingBundleName](avfoundation/avmediaextensionproperties/containingbundlename.md)
- [extensionURL](avfoundation/avmediaextensionproperties/extensionurl.md)
- [containingBundleURL](avfoundation/avmediaextensionproperties/containingbundleurl.md)