swift 快速奔跑的兔几 本节的内容是：UIDynamic：UI和重力

概述import UIKitclass ViewController: UIViewController { @IBOutlet weak var dynamicImageView: UIImageView! var dynamicAnimator = UIDynamicAnimator() override func viewDidLoad() { s

import UIKitclass VIEwController: UIVIEwController {    @IBOutlet weak var dynamicImageVIEw: UIImageVIEw!    var dynamicAnimator = UIDynamicAnimator()    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        let img1 = UIImage(named:"littleYellowMan.jpg")        dynamicImageVIEw.image = img1        dynamicAnimator = UIDynamicAnimator(referenceVIEw: self.vIEw)        let gravityBehavior = UIGravityBehavior(items: [self.dynamicImageVIEw])        dynamicAnimator.addBehavior(gravityBehavior)        let collisionBehavior = uicollisionbehavior(items: [self.dynamicImageVIEw])        collisionBehavior.translatesReferenceBoundsIntoBoundary = true        dynamicAnimator.addBehavior(collisionBehavior)    }    overrIDe func dIDReceiveMemoryWarning() {        super.dIDReceiveMemoryWarning()        // dispose of any resources that can be recreated.    }}

运行结果：图片掉落下去，撞到屏幕的边界

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