Swift 动画效果

1. 原生UIKit CoreAnimation

let ball = UIView(frame: CGRectMake(50, 50, 100, 100))ball.backgroundColor = UIColor.purpleColor()ball.layer.cornerRadius = 50self.view.addSubview(ball)//动画执行时间， 延迟时间，动画运动曲线，所有变化结果，结束后执行的闭包// UIView.animateWithDuration(0.5, delay: 1, options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in//变化结果//ball.transform = CGAffineTransformMakeScale(2, 2),    //动画组合Concat//  ball.transform = CGAffineTransformConcat(CGAffineTransformMakeScale(1.2, 1.2), CGAffineTransformMakeTranslation(150, 140))//            //ball.backgroundColor = UIColor.grayColor()//        }, completion: nil)//弹性动画usingSpringWithDamping 相当于减速运动中减速度,initialSpringVelocity初速度UIView.animateWithDuration(2, delay: 1.5, usingSpringWithDamping: 0.3, initialSpringVelocity: 0, options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in                        ball.transform = CGAffineTransformConcat(CGAffineTransformMakeScale(1.2, 1.2), CGAffineTransformMakeTranslation(150, 140))        }, completion: nil)

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2.JNW
先去 git上 https://github.com/jwilling/JNWSpringAnimation
是oc写的,所以要做一些改动，在桥接文件中倒入JNW后，还要再导入UIKit/UIKit.h

• 放大缩小

class ViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()        let ball = UIView(frame: CGRectMake(50, 50, 100, 100))        ball.backgroundColor = UIColor.purpleColor()        ball.layer.cornerRadius = 50        self.view.addSubview(ball)        //创建JNW对象        let scale1 = JNWSpringAnimation(keyPath: "transform.scale")        //设置阻尼值（动画衰减）        scale1.damping = 6        //设置弹性系数（动画振幅）         scale1.stiffness = 100        //设置质量（动画快慢效果）         scale1.mass = 2        //设置初始值与接收值        scale1.fromValue = 1        scale1.toValue = 2        //将JNW赋给ball        ball.layer.addAnimation(scale1, forKey: scale1.keyPath)        //默认还原初始状态，手动修改        ball.transform = CGAffineTransformMakeScale(2, 2)    }

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• 旋转

        let rotation = JNWSpringAnimation(keyPath: "transform.rotation")        rotation.damping = 3        rotation.stiffness = 100        rotation.mass = 1        rotation.fromValue = 0        rotation.toValue = M_PI_2        ball.layer.addAnimation(rotation, forKey: rotation.keyPath)        ball.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_2))

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• 水平移动

            var angle:Double = 1            let translation = JNWSpringAnimation(keyPath: "transform.translation.x")            translation.damping = 6            translation.stiffness = 100            translation.mass = 2            translation.fromValue = 0            translation.toValue = 400            ball.layer.addAnimation(translation, forKey: translation.keyPath)            ball.transform = CGAffineTransformMakeTranslation(400, 0)

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JNW组合动画，要几个效果创建几个JNW对象就可以了！

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