Animation killed the CPU star.md

Code snippets for the blog post "Animation killed the CPU star" at http://www.apokrupto.com/blog-1/2016/7/16/qd2osqnhgywx23tqm6qcpwgouufpls

view-controller-with-rotation.swift

class ViewController: UIViewController {
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        NSNotificationCenter.defaultCenter().postNotificationName(OBAnimatingViewBehaviour.Action.animate, object: self)
    }
    
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
        NSNotificationCenter.defaultCenter().postNotificationName(OBAnimatingViewBehaviour.Action.stop, object: self)
    }
}