switchviews

CGRect  viewRect = CGRectMake(0, 0, 100, 100);
    
    UIColor * greyColor = [UIColor colorWithRed:230.0/255.0 green:230.0/255.0 blue:230.0/255.0 alpha:1.0];
    [greyColor setFill];
    UIRectFill( viewRect );
    
    UIViewController *rootViewController = [[UIApplication sharedApplication] keyWindow].rootViewController;
    
    UIView* myView = [[UIView alloc] initWithFrame:viewRect];
    myView.backgroundColor = greyColor;
    [rootViewController.view addSubview:myView];
    return self;