Swift 连续旋转动画不是那么连续

Question

这是我的代码。目的是不断旋转名为 swirls[l] 的 UIImageView。但是，每次旋转之间都有一个小停顿 start/end。我已经看完了每一个动画教程，但无法弄清楚错误是什么？

let fullRotation = CGFloat(M_PI * 2)

    let duration = 2.0
    let delay = 0.0
    let options = UIViewKeyframeAnimationOptions.Repeat | UIViewKeyframeAnimationOptions.CalculationModeLinear

    UIView.animateKeyframesWithDuration(duration, delay: delay, options: options, animations: {
        UIView.addKeyframeWithRelativeStartTime(0, relativeDuration: 1/3, animations: {
            swirls[l].transform = CGAffineTransformMakeRotation(1/3 * fullRotation)
        })
        UIView.addKeyframeWithRelativeStartTime(1/3, relativeDuration: 1/3, animations: {
            swirls[l].transform = CGAffineTransformMakeRotation(2/3 * fullRotation)
        })
        UIView.addKeyframeWithRelativeStartTime(2/3, relativeDuration: 1/3, animations: {
            swirls[l].transform = CGAffineTransformMakeRotation(3/3 * fullRotation)
        })

        }, completion: {finished in 
    })

编辑：我看到有人建议以前的解决方案可用，但它根本不适用于连续不间断的旋转。唯一对我有用的技巧是我在下面选择的答案。谢谢

Answer 1

我不确定你的代码有什么问题，但我已经使用这种方法实现了连续旋转，

@IBAction func rotateView(sender: UIButton) {
    UIView.animate(withDuration: 0.5, delay: 0, options: .curveLinear, animations: { () -> Void in
        self.spinningView.transform = self.spinningView.transform.rotated(by: .pi / 2)
    }) { (finished) -> Void in
        self.rotateView(sender: sender)
    }
}

Answer 2

如果您想连续旋转 Button 或 View 并随时停止旋转，那么您可以试试这个：对于开始旋转：

@IBOutlet weak var RotateBtn: UIButton!
var timeTimer: Timer?

viewDidLoad()
{
  self.rotateView()
  timeTimer = Timer.scheduledTimer(timeInterval: 0.5, target: self, selector: #selector(self.rotateView), userInfo: nil, repeats: true)
}

func rotateView()
{
    UIView.animate(withDuration: 0.5, delay: 0, options: .curveLinear, animations: { () -> Void in
        self.RotateBtn.transform = self.RotateBtn.transform.rotated(by: CGFloat(M_PI_4))
    })
}

如果你想停止旋转然后使用：

@IBAction func StopBtn_Pressed(_ sender: AnyObject)
{
   timeTimer?.invalidate()
   self.RecordBtn.layer.removeAllAnimations()
}

Answer 3

尝试以下 swift 4.

的扩展

extension UIView {
    func rotate360Degrees(duration: CFTimeInterval = 3) {
        let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
        rotateAnimation.fromValue = 0.0
        rotateAnimation.toValue = CGFloat(Double.pi * 2)
        rotateAnimation.isRemovedOnCompletion = false
        rotateAnimation.duration = duration
        rotateAnimation.repeatCount=Float.infinity
        self.layer.add(rotateAnimation, forKey: nil)
    }
}

开始轮换。

MyView.rotate360Degrees()

停止。

MyView.layer.removeAllAnimations()

您可以使用 UIButton、UILabel 等等。

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