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# UINavigationControllerDelegate

The interface for an object that serves as a navigation controller’s delegate.

```
@MainActor protocol UINavigationControllerDelegate : NSObjectProtocol
```

## Overview

Use a navigation controller delegate (a custom object that implements this protocol) to modify behavior when a view controller is pushed or popped from the navigation stack of a [`UINavigationController`](/documentation/UIKit/UINavigationController) object.

## Topics

### Responding to a view controller being shown

[`navigationController(_:willShow:animated:)`](/documentation/UIKit/UINavigationControllerDelegate/navigationController(_:willShow:animated:))

Notifies the delegate before the navigation controller displays a view controller’s view and navigation item properties.

[`navigationController(_:didShow:animated:)`](/documentation/UIKit/UINavigationControllerDelegate/navigationController(_:didShow:animated:))

Notifies the delegate after the navigation controller displays a view controller’s view and navigation item properties.

### Supporting custom transition animations

[`navigationController(_:animationControllerFor:from:to:)`](/documentation/UIKit/UINavigationControllerDelegate/navigationController(_:animationControllerFor:from:to:))

Allows the delegate to return a noninteractive animator object for use during view controller transitions.

[`navigationController(_:interactionControllerFor:)`](/documentation/UIKit/UINavigationControllerDelegate/navigationController(_:interactionControllerFor:))

Allows the delegate to return an interactive animator object for use during view controller transitions.

[`navigationControllerPreferredInterfaceOrientationForPresentation(_:)`](/documentation/UIKit/UINavigationControllerDelegate/navigationControllerPreferredInterfaceOrientationForPresentation(_:))

Returns the preferred orientation for presentation of the navigation controller, as determined by the delegate.

[`navigationControllerSupportedInterfaceOrientations(_:)`](/documentation/UIKit/UINavigationControllerDelegate/navigationControllerSupportedInterfaceOrientations(_:))

Returns the complete set of supported interface orientations for the navigation controller, as determined by the delegate.

### Constants

[`UINavigationController.Operation`](/documentation/UIKit/UINavigationController/Operation)

Constants that define the type of navigation controller transitions that can occur.


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