public class KeyboardMonitor: BaseNotificationMonitor
KeyboardMonitor instance monitors the keyboard for changes to its
visibility or to its frame.
Initializes a new
The options that specify which events to monitor. By default, all events are monitored.
The operation queue on which the handler executes. By default, the main operation queue is used.
The handler to call when the visibility of the keyboard or the frame of the keyboard changes or is about to change.
override public func addNotificationObservers()