Swift如何播放和暂停UIBezier动画

Question

我正在一个项目中，我使用圆形的UIBezier动画显示倒数计时器。我有一个播放和暂停按钮，可以开始和停止对时间的跟踪，但是动画还在继续。

如何暂停和恢复动画？这是我正在使用的代码段：

func drawCircleAnimation(minutes : Double) {
    let padding = CGFloat(220)
    let height = minuteLabel.frame.height + padding
    let circularPath = UIBezierPath(arcCenter: minuteLabel.layer.position, radius: (height/2), startAngle: -.pi / 2, endAngle: 2 * .pi, clockwise: true)

    progressLayer.path = circularPath.cgPath
    progressLayer.fillColor = UIColor.clear.cgColor
    progressLayer.strokeColor = UIColor(named: K.BrandColors.orange)?.cgColor
    progressLayer.lineCap = .round
    progressLayer.lineWidth = 10.0
    progressLayer.strokeEnd = 0
    mainContent.layer.addSublayer(progressLayer)
    
    progressAnimation.toValue = 1
    progressAnimation.duration = (minutes * 60)
    progressAnimation.fillMode = .forwards
    progressAnimation.isRemovedOnCompletion = true
    progressLayer.add(progressAnimation, forKey: "progressAnim")
    
}
@IBAction func playPauseButton(_ sender: UIButton) {
    exerciseSwitchStack.distribution = .fillEqually
    sender.setTitle("", for: UIControl.State.normal)
    if isTimeRunning == false {
        startTimer()
        resumeAnimation()
        drawCircleAnimation(minutes: Double(workout?.exerciseArr[counter].minuteNum ?? 0))
        sender.setImage(UIImage(named: "pause"), for: UIControl.State.normal)
    }
    else {
        pauseTimer()
        pauseAnimation(minutes: 2)
        sender.setImage(UIImage(named: "play"), for: UIControl.State.normal)
    }
}
@IBAction func playPauseButton(_ sender: UIButton) {
    exerciseSwitchStack.distribution = .fillEqually
    sender.setTitle("", for: UIControl.State.normal)
    if isTimeRunning == false {
        startTimer()
        resumeAnimation()
        drawCircleAnimation(minutes: Double(workout?.exerciseArr[counter].minuteNum ?? 0))
        sender.setImage(UIImage(named: "pause"), for: UIControl.State.normal)
    }
    else {
        pauseTimer()
        pauseAnimation(minutes: 2)
        sender.setImage(UIImage(named: "play"), for: UIControl.State.normal)
    }
}

非常感谢您的帮助！