---
title: os_activity_t
framework: os
role: symbol
role_heading: Type Alias
path: os/os_activity_t
---

# os_activity_t

An object that represents an activity triggered by the user.

## Declaration

```occ
typedef NSObject<OS_os_activity> * os_activity_t;
```

## Topics

### Choosing a Special Activity

- [OS_ACTIVITY_NONE](os/os_activity_none.md)
- [OS_ACTIVITY_CURRENT](os/os_activity_current.md)