---
title: Transition Animation Keys
framework: appkit
role: collectionGroup
role_heading: API Collection
path: appkit/transition-animation-keys
---

# Transition Animation Keys

The following constants define the keys that reference the transitions used as views are made visible and hidden.

## Topics

### Constants

- [NSAnimationTriggerOrderIn](appkit/nsanimationtriggerorderin.md)
- [NSAnimationTriggerOrderOut](appkit/nsanimationtriggerorderout.md)