The custom input accessory view controller to display when the receiver becomes the first responder.
- iOS 8.0+
- tvOS 9.0+
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
input property), redeclare this property as read-write in a
UIResponder subclass. You can then use this property to manage a custom accessory view. When the receiver becomes the first responder, the responder infrastructure attaches the accessory view to the appropriate input view before displaying it.