how to add another UIWindow within the some part of the screen - ios

Question

I have requirement like inside the view I need to push some other view controllers. For that I tried to add a one window as subview for that particular view then I have given the desired view controller to root view controller for that window. It is showing correctly but the rootviewcontroller is starting from screen (0, 0) point instead of within the window.
In this picture red color is the view controller and gray one is the view with the origin (0, 100). Below is the code I have tried.
UIWindow *insideWindow = [[UIWindow alloc] initWithFrame: CGRectMake(0, 100, _windowView.frame.size.width, _windowView.frame.size.height)];
insideWindow.backgroundColor = [UIColor yellowColor];
insideWindow.windowLevel = UIWindowLevelNormal;
insideWindow.hidden = NO;
insideWindow.clipsToBounds = YES;
insideWindow.bounds = _windowView.bounds;
_windowView.clipsToBounds = YES;
[_windowView addSubview: insideWindow];
SecondViewController *s = [SecondViewController new];
s.view.bounds = CGRectMake(0, 100, _windowView.frame.size.width, _windowView.frame.size.height);
insideWindow.rootViewController = [SecondViewController new];
[insideWindow makeKeyAndVisible];
It is not a duplicate with how to add multiple UIWindows. Here I can able to add the multiple windows But the problem is inside window the viewcontrollers are not setting properly.

Answer 1

I don't really know what you want to achieve but here we go...
SecondViewController *s = [SecondViewController new];
s.view.bounds = CGRectMake(0, 100, _windowView.frame.size.width, _windowView.frame.size.height);
insideWindow.rootViewController = [SecondViewController new];
You basically create an instance of SecondViewController, then you set the bounds (wrong idea) then you assign as window rootViewController another instance of SecondViewController.
The difference between the frame and bounds of a view: Bounds vs Frame
If you want to go that way, then:
SecondViewController *s = [SecondViewController new];
s.view.frame = CGRectMake(0, 100, _windowView.frame.size.width, _windowView.frame.size.height);
insideWindow.rootViewController = s;
Instead of adding windows to display view controllers why you don't add the "SecondViewController" as child to the controller which has the "gray" view?
SecondViewController *s = [SecondViewController new];
[firstViewController addChildViewController:s];
s.view.frame = grayView.bounds; // or CGRectMake(...)
[grayView addSubview:s.view];
[s didMoveToViewController:firstViewController];