Xcode9学习笔记54

    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.        let rect = CGRect(x: 0, y: 0, width: 499, height: 726)        let imageView = UIImageView(frame: rect)                let image = UIImage(named: "Pic3")        imageView.image = image//给图像视图添加要显示的图片                self.view.addSubview(imageView)                let animation = CATransition()        animation.duration = 2//设置动画时长2秒        //设置动画的播放速度为由慢至块        animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)        animation.type = kCATransitionReveal//设置动画的类型为渐显动画                imageView.layer.add(animation, forKey: "Reveal")//将动画指定给图像视图的层    }