swift 从NSTimeInterval转换为swift中的小时，分​​钟，秒，毫秒 - 来自http://stackoverflow.com/questions/28872450/conversi

Posted 2021-05-19

func stringFromTimeInterval(interval: TimeInterval) -> NSString {

  let ti = NSInteger(interval)

  let ms = Int((interval % 1) * 1000)

  let seconds = ti % 60
  let minutes = (ti / 60) % 60
  let hours = (ti / 3600)

  return NSString(format: "%0.2d:%0.2d:%0.2d.%0.3d",hours,minutes,seconds,ms)
}