ios - 动画按钮 360 顺时针和反向返回

Question

使按钮顺时针旋转 360 度，然后逆时针旋转 360 度。但不是动画...动画始终是顺时针方向的 360 度。

func animateShowingOfMenu(){

        let angle = CGFloat(180 * M_PI / 180)
        UIView.animateWithDuration(0.4
            , animations: { () -> Void in

                self.blurView.hidden=false
                self.menuBtn.transform = CGAffineTransformMakeRotation(angle)
                self.menuBtn.transform = CGAffineTransformMakeRotation(0)


            }) { (completion) -> Void in

                print("compeleted")
        }

    }

    func animateHidingOfMenu(){

        let angle = CGFloat(-180 * M_PI / 180)
        UIView.animateWithDuration(0.4
            , animations: { () -> Void in

                self.blurView.hidden = true
                self.menuBtn.transform = CGAffineTransformMakeRotation(angle)
                self.menuBtn.transform = CGAffineTransformMakeRotation(0)


            }) { (completion) -> Void in

        }
    }

Answer 1

Swift 5 上的简单通用解决方案

你可以旋转任何东西

    //Clock-wise
    rotateAnyView(view: makeOrderButton, fromValue: 0, toValue: 2.0 * Double.pi, duration: 1)

    //Reverse
    rotateAnyView(view: makeOrderButton, fromValue: 2.0 * Double.pi, toValue:0, duration: 1)


}

func rotateAnyView(view: UIView, fromValue: Double, toValue: Double, duration: Double = 1) {
    let animation = CABasicAnimation(keyPath: "transform.rotation")
    animation.duration = duration
    animation.fromValue = fromValue
    animation.toValue = toValue
    view.layer.add(animation, forKey: nil)
}