Swift封装持续旋转动画

网上搜索旋转动画的时候看到一篇OC的博客的实现，因为我是Swift项目，用Swift改写下为后面用做准备吧。

代码如下：

import Foundation
import UIKit

//设置逆时针和顺时针旋转的枚举
enum Direction {
    case DirectionReight
    case DirectionLeft
}

class Animation: NSObject {
    func setAnimation(control: UIView, direction: Direction) {
        // y是根据y轴旋转，x是根据x轴旋转，z是根据z轴旋转

        // 如果是y, 则transform.rotation.y,如果是x,则transform.rotation.x, 如果是z,则transform.rotation.z
        let rotationAnimation: CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        // 这里  M_PI * 2.0  为顺时针旋转，如果想要逆时针旋转可以写成  M_PI * -2.0
        if(direction == .DirectionReight) {
            rotationAnimation.toValue = NSNumber(value: Double.pi * 2.0)
        } else {
            rotationAnimation.toValue = NSNumber(value: Double.pi * -2.0)
        }
        rotationAnimation.duration = 2.0
        rotationAnimation.isRemovedOnCompletion = false
        rotationAnimation.repeatCount = MAXFLOAT
        rotationAnimation.fillMode = .forwards
        control.layer.add(rotationAnimation, forKey: "rotationAnimation")
    }
}

使用如下:

Animation().setAnimation(control: roundView, direction: .DirectionReight)

移除动画：

roundView.layer.removeAllAnimations()

参考链接：

https://www.jianshu.com/p/ba7fee11f7a1