unregister method

void unregister ()

Removes this object as a mock handler for SystemChannels.textInput.

After calling this method, the channel will exchange messages with the Flutter engine. Use this with FlutterDriver tests that need to display on-screen keyboard provided by the operating system.

Implementation 

void unregister() {
  SystemChannels.textInput.setMockMethodCallHandler(null);
  _isRegistered = false;
}