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# inputAccessoryViewController

The custom input accessory view controller to display when the responder becomes the first responder.

```
var inputAccessoryViewController: UIInputViewController? { get }
```

## Discussion

This property is typically used to attach an accessory view controller to the system-supplied keyboard that’s presented for [`UITextField`](/documentation/UIKit/UITextField) and [`UITextView`](/documentation/UIKit/UITextView) objects.

The value of this read-only property is `nil`. If you want to attach custom controls to a system-supplied input view controller (such as the system keyboard) or to a custom input view (one you provide in the [`inputViewController`](/documentation/UIKit/UIResponder/inputViewController) property), redeclare this property as read-write in a [`UIResponder`](/documentation/UIKit/UIResponder) subclass. You can then use this property to manage a custom accessory view. When the responder becomes the first responder, the responder infrastructure attaches the accessory view to the appropriate input view before displaying it.

---

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