MainViewController.swift

func addLookAroundController(lookAroundController: UIViewController) {
    view.addSubview(lookAroundController.view)
        
    lookAroundController.view.translatesAutoresizingMaskIntoConstraints = false
    lookAroundController.view.heightAnchor.constraint(equalToConstant: 90).isActive = true
    lookAroundController.view.widthAnchor.constraint(equalToConstant: 130).isActive = true

    lookAroundController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 16).isActive = true
    lookAroundController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16).isActive = true
                
    addChild(lookAroundController)
    lookAroundController.didMove(toParent: self)    
}