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# NSViewControllerPresentationAnimator

A set of methods that let you define animations to play when transitioning between two view controllers.

```
protocol NSViewControllerPresentationAnimator : NSObjectProtocol
```

## Overview

Implement this protocol only if you want to provide custom animations. You might find what you need in the [`NSViewController.TransitionOptions`](/documentation/AppKit/NSViewController/TransitionOptions) enumeration, which provides many predefined animations.

A class that adopts this protocol is responsible for both presenting and dismissing a view controller.

## Topics

### Animating Presentation and Dismissal of View Controllers

[`animatePresentation(of:from:)`](/documentation/AppKit/NSViewControllerPresentationAnimator/animatePresentation(of:from:))

Called when the specified view controller is about to be presented.

[`animateDismissal(of:from:)`](/documentation/AppKit/NSViewControllerPresentationAnimator/animateDismissal(of:from:))

Called when a previously-presented view controller is about to be dismissed.


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