A example of UIDynamic Classes

DynamicWorld

import UIKit
import PlaygroundSupport



class physicViewController : UIViewController {


    lazy var dynamicAnimator: UIDynamicAnimator = {

        return UIDynamicAnimator(referenceView: self.view)
    }()

    lazy var cube: UIView = {

        let cube = UIView(frame: CGRect(origin: CGPoint(x: 100.0, y: 100.0), size: CGSize(width: 100.0, height: 100.0)))
        cube.backgroundColor = UIColor.blue

        self.view.addSubview(cube)

        return cube

    }()

    let gravity = UIGravityBehavior()
    let collision = UICollisionBehavior()
    let itemBehavior = UIDynamicItemBehavior()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor.white


    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)




        gravity.addItem(cube)
        dynamicAnimator.addBehavior(gravity)

        collision.addItem(cube)
        collision.translatesReferenceBoundsIntoBoundary = true
        
        dynamicAnimator.addBehavior(collision)

        itemBehavior.addItem(cube)
        itemBehavior.allowsRotation = true
        itemBehavior.friction = 0.3
        itemBehavior.angularResistance = 0.1
        dynamicAnimator.addBehavior(itemBehavior)

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(pushIt))
        view.addGestureRecognizer(tapGesture)


    }

    func pushIt(){
        let push = UIPushBehavior(items: gravity.items, mode: .instantaneous)
        push.magnitude = 10.0
        push.pushDirection = CGVector.init(dx: 5.0, dy: -10.0)

        dynamicAnimator.addBehavior(push)
    }


}



let viewController = physicViewController()


PlaygroundPage.current.liveView = viewController