-(void)viewWillAppear:(BOOL)animated

{ ? ?[superviewWillAppear:animated];

? ? [_mapView performSelector:NSSelectorFromString(@"onNotificationDidBecomeActive")];

? ? [_mapView viewWillAppear];

}

-(void)viewWillDisappear:(BOOL)animated{

? ? [super viewWillDisappear:animated];

? ? [_mapView viewWillDisappear];

}