Container_Views

Add Other ViewControllers As subview in Container View

Code Used

Reference to Controller to be added as Subview

  private lazy var FirstObject: firstVC =
  {
    // Instantiate View Controller
    let viewController = self.storyboard?.instantiateViewController(withIdentifier: "firstVC") as! firstVC
    
    // Add View Controller as Child View Controller
    self.addChildViewController(viewController)
    return viewController
  }()

• Used Table Views As Subview in Second Controller Thus, Complex Designs can also be implemnted in same manner

Adding subview to Container View

 private func add(asChildViewController viewController: UIViewController)
{
    // Configure Child View
    viewController.view.frame = CGRect(x: 0, y: 0, width: self.firstContainer.frame.size.width, height: self.firstContainer.frame.size.height)
    
    // Add Child View Controller
    addChildViewController(viewController)
    viewController.view.translatesAutoresizingMaskIntoConstraints = true
    
    // Add Child View as Subview
    firstContainer.addSubview(viewController.view)
    
    // Notify Child View Controller
    viewController.didMove(toParentViewController: self)
}

Subviews Are being managed using code So, If required Added VC as Subview can aslo be Removed using

 private func remove(asChildViewController viewController: UIViewController)
{
    // Notify Child View Controller
    viewController.willMove(toParentViewController: nil)
    
    secondContainer.willRemoveSubview(viewController.view)
    
    // Remove Child View From Superview
    viewController.view.removeFromSuperview()
    
    // Notify Child View Controller
    viewController.removeFromParentViewController()
}

Expected Output