---
title: "start(definition:)"
framework: gamekit
role: symbol
role_heading: Type Method
path: "gamekit/gkgameactivity/start(definition:)"
---

# start(definition:)

Creates and starts a game activity with a definition.

## Declaration

```swift
class func start(definition activityDefinition: GKGameActivityDefinition) throws -> GKGameActivity
```

## See Also

### Creating an activity

- [init(definition:)](gamekit/gkgameactivity/init(definition:).md)
- [start(definition:partyCode:)](gamekit/gkgameactivity/start(definition:partycode:).md)