---
title: "key(forIdentifier:)"
framework: avfoundation
role: symbol
role_heading: Type Method
path: "avfoundation/avmetadataitem/key(foridentifier:)"
---

# key(forIdentifier:)

Returns a metadata key for the specified identifier.

## Declaration

```swift
class func key(forIdentifier identifier: AVMetadataIdentifier) -> Any?
```

## Parameters

- `identifier`: The metadata identifier.

## Return Value

Return Value A metadata key.

## See Also

### Translating metadata items

- [identifier(forKey:keySpace:)](avfoundation/avmetadataitem/identifier(forkey:keyspace:).md)
- [keySpace(forIdentifier:)](avfoundation/avmetadataitem/keyspace(foridentifier:).md)