如何通过CGEvent模拟惯性滚动效果？

我希望让应用用户能够通过CGEvent实现带有缓入（ease-in）和缓出（ease-out）动画的滚动效果。目前我已经能通过CGEvent发送滚动事件，下面是用来演示需求的简易Playground代码。

由于找不到实现此功能的简易API，我想到通过多次滚动（至少几十次）并在中间添加延迟的方式来实现。我当然可以提高scrollY函数的精度，但希望能找到更简便、更流畅的实现方式。

extension CGEvent {
  public class func scrollMouse(onPoint point: CGPoint, xLines: Int, yLines: Int) {
    if #available(OSX 10.13, *) {
      guard let scrollEvent = CGEvent(scrollWheelEvent2Source: nil, units: CGScrollEventUnit.line, wheelCount: 2, wheel1: Int32(yLines), wheel2: Int32(xLines), wheel3: 0) else {
        return
      }
      scrollEvent.setIntegerValueField(CGEventField.eventSourceUserData, value: 1)
      scrollEvent.post(tap: CGEventTapLocation.cghidEventTap)
    } else {
      // scroll event is not supported for macOS older than 10.13
    }
  }
}


func scrollY() {
  let y = 12
  let sleep: UInt32 = 10000
  
  // The ease-IN portion
  for i in stride(from: 1, to: y, by: 1) {
    CGEvent.scrollMouse(onPoint: CGPoint.zero, xLines: 0, yLines:-i)
    usleep(sleep * UInt32(i))
  }
  
  // The ease-OUT portion
  for i in stride(from: y, to: 1, by: -1) {
    CGEvent.scrollMouse(onPoint: CGPoint.zero, xLines: 0, yLines:-i)
    usleep(sleep * UInt32(y + (y - i)))
  }
}

内容的提问来源于stack exchange，提问作者se_puede_dev