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# init(navigationBarClass:toolbarClass:)

Initializes and returns a newly created navigation controller that uses your custom bar subclasses.

```
init(navigationBarClass: AnyClass?, toolbarClass: AnyClass?)
```

## Parameters

`navigationBarClass`

Specify the custom [`UINavigationBar`](/documentation/UIKit/UINavigationBar) subclass you want to use, or specify `nil` to use the standard [`UINavigationBar`](/documentation/UIKit/UINavigationBar) class.

`toolbarClass`

Specify the custom [`UIToolbar`](/documentation/UIKit/UIToolbar) subclass you want to use, or specify `nil` to use the standard [`UIToolbar`](/documentation/UIKit/UIToolbar) class.

## Return Value

The initialized navigation controller object or `nil` if there was a problem initializing the object.

## Discussion

To customize the overall appearance of a navigation bar, use [`UIAppearance`](/documentation/UIKit/UIAppearance) APIs instead of this method. If you use this initialization method to create a navigation bar that uses custom bar subclasses, you are responsible for pushing and setting view controllers before presenting the navigation controller onscreen.

---

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