TransitionManager.swift file

//
//  TransitionManager.swift
//  Ritvik Choudhary
//
//  Created by Ritvik Choudhary on 20/04/15.
//  Copyright (c) 2015 ritvik1512. All rights reserved.
//

import UIKit

class TransitionManager: NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate
{

    // MARK: UIViewControllerAnimatedTransitioning protocol methods

    // animate a change from one viewcontroller to another
    func animateTransition(transitionContext: UIViewControllerContextTransitioning)
    {
        // TODO: Perform the animation
        // get reference to our fromView, toView and the container view that we should perform the transition in
        let container = transitionContext.containerView()
        let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
        let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!

        // set up from 2D transforms that we'll use in the animation
        let offScreenRight = CGAffineTransformMakeTranslation(container.frame.width, 0)
        let offScreenLeft = CGAffineTransformMakeTranslation(-container.frame.width, 0)

        // start the toView to the right of the screen
        toView.transform = offScreenRight

        // add the both views to our view controller
        container.addSubview(toView)
        container.addSubview(fromView)

        // get the duration of the animation

        let duration = self.transitionDuration(transitionContext)

        // perform the animation!
        UIView.animateWithDuration(duration, delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.8, options: nil, animations: {

            fromView.transform = offScreenLeft
            toView.transform = CGAffineTransformIdentity

            }, completion: { finished in

                // tell our transitionContext object that we've finished animating
                transitionContext.completeTransition(true)

        })

    }


    }

    // return how many seconds the transiton animation will take
    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval
    {
        return 0.5
    }

    // MARK: UIViewControllerTransitioningDelegate protocol methods

    // return the animataor when presenting a viewcontroller

    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning?
    {
        return nil
    }

    // return the animator used when dismissing from a viewcontroller
    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning?
    {
        return nil
    }