Swift - 使用UI Dynamics给UIKit组件添加重力和碰撞行为

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import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!

    var dynamicAnimator = UIDynamicAnimator()

    override func viewDidLoad() {

        super.viewDidLoad()

        dynamicAnimator = UIDynamicAnimator(referenceView: self.view)

        //创建并添加重力行为

        let gravityBehavior = UIGravityBehavior(items: [self.imageView])

        dynamicAnimator.addBehavior(gravityBehavior)

        //创建并添加碰撞行为

        let collisionBehavior = UICollisionBehavior(items: [self.imageView])

        collisionBehavior.translatesReferenceBoundsIntoBoundary = true

        dynamicAnimator.addBehavior(collisionBehavior)

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

    }

}