ECSlidingviewcontroller-2 : Trying To Achieve Bounce Animation

Question

I'm using ecslidingviewcontroller 2 and i'm trying to make a bouncy animation when open the off-canvas menu or close it ..

I know it should be in the method

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext ;

But i have no idea how it should be cause i have a little experience in the animation coding.