The custom accessory view to display when the text field becomes the first responder
- iOS 3.2+
- tvOS 9.0+
The default value of this property is
nil. Assigning a view to this property causes that view to be displayed above the standard system keyboard (or above the custom input view if one is provided) when the text field becomes the first responder. For example, you could use this property to attach a custom toolbar to the keyboard.