*<Null safety>*
Future<void> requestFocus (int viewRef)
Future<void> requestFocus(int viewRef) async { final args = <String, dynamic>{ 'viewRef': viewRef, }; final result = await platformViewChannel.invokeMethod('View.requestFocus', args); // Throw OSError if result is non-zero. if (result != 0) { throw OSError( 'Failed to request focus for view: $viewRef with $result', result, ); } }