Child View Controller

BaseViewController.swift

//
//  BaseViewController.swift
//  Child Container ViewController Methods
//
//  Created by Bill Richards on 2/11/15.
//  Copyright (c) 2015 Bill Richards. All rights reserved.
//

import UIKit


extension UIViewController {
    
    func displayContentViewControllerInView(viewController: UIViewController!, view: UIView!) {

        self.addChildViewController(viewController)
        view.addSubview(viewController.view)
        
        viewController.view.setTranslatesAutoresizingMaskIntoConstraints(false)
        let superview = view
        
        superview.addConstraints([
            NSLayoutConstraint(
                item: viewController.view,
                attribute: NSLayoutAttribute.Top,
                relatedBy: NSLayoutRelation.Equal,
                toItem: superview,
                attribute: NSLayoutAttribute.Top,
                multiplier: 1.0,
                constant: 0
            ),
            NSLayoutConstraint(
                item: viewController.view,
                attribute: NSLayoutAttribute.Bottom,
                relatedBy: NSLayoutRelation.Equal,
                toItem: superview,
                attribute: NSLayoutAttribute.Bottom,
                multiplier: 1.0,
                constant: 0
            ),
            NSLayoutConstraint(
                item: viewController.view,
                attribute: NSLayoutAttribute.Left,
                relatedBy: NSLayoutRelation.Equal,
                toItem: superview,
                attribute: NSLayoutAttribute.Left,
                multiplier: 1.0,
                constant: 0
            ),
            NSLayoutConstraint(
                item: viewController.view,
                attribute: NSLayoutAttribute.Right,
                relatedBy: NSLayoutRelation.Equal,
                toItem: superview,
                attribute: NSLayoutAttribute.Right,
                multiplier: 1.0,
                constant: 0
            )
        ])
        
        viewController.didMoveToParentViewController(self)
    }
    
    
    func hideContentViewController(viewController: UIViewController?) {
        
        if let vc = viewController as UIViewController! {
            vc.willMoveToParentViewController(nil)
            vc.view.removeFromSuperview()
            vc.removeFromParentViewController()
        }
    }
    
}