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# UINavigationController.Operation

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

```
enum Operation
```

## Topics

### Constants

[`UINavigationController.Operation.none`](/documentation/UIKit/UINavigationController/Operation/none)

A constant that indicates no operation is taking place.

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

A constant that indicates a view controller is being pushed onto the navigation stack.

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

A constant that indicates the topmost view controller is being removed from the navigation stack.


---

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