随着时间的流逝更快地移动对象

Question

var newSpeed = speed
var newProgress = progress
newSpeed += 2/Double(duration)
newProgress += newSpeed/Double(duration)

if progress >= 1 {
    return
}
UIView.animate(withDuration: 1, delay: 0, options: .curveLinear, animations: {
    self.ringProgressView.progress = newProgress
    print("The newProgress is: \(newProgress), and the new speed is \(newSpeed)")
}) { (hello) in

    if (newSpeed*100).rounded()/100 == 1.0 {
        newProgress += newSpeed/Double(duration)
        UIView.animate(withDuration: 1, delay: 0, options: .curveLinear, animations: {
            self.ringProgressView.progress = newProgress
            print("The newProgress is: \(newProgress), and the new speed is \(newSpeed)")
        }) { (hello) in
            self.animation(duration: duration, speed: newSpeed, progress: newProgress)
        }
    } else {
        self.animation(duration: duration, speed: newSpeed, progress: newProgress)
    }
}
UIView.animate(withDuration: TimeInterval(duration), delay: 0, options: UIViewAnimationOptions.curveLinear, animations: {
    moveFaster = 180
    self.ringProgressView.progress += Double((360 + moveFaster) / 360 / duration)
})

随着时间的推移，我正在做的是尝试加速ringProgressView.progress。

基本上，我需要做的是给函数提供一个秒变量（即30秒），然后通过加速，使ringProgressView.progress结束（达到1.0），开始时变慢，结束时变快。