---
title: identifier
framework: gamekit
role: symbol
role_heading: Instance Property
path: gamekit/gkchallengedefinition/identifier
---

# identifier

The developer defined identifier for a given challenge definition.

## Declaration

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

## See Also

### Getting the identifier properties

- [groupIdentifier](gamekit/gkchallengedefinition/groupidentifier.md)