您可以使用DispatchWorkItem并执行去抖动，这将有助于在需要命中第二个API时取消第一个API。

private var pendingRequestWorkItem : DispatchWorkItem? // your work item

//function which calls your API being hit
func getData() {

  // cancels the first api or the the api currently being hit
  self.pendingRequestWorkItem?.cancel()
  
  let requestWorkItem = DispatchWorkItem { [weak self] in
    self?.getDataFromAPI()
  }
  self.pendingRequestWorkItem = requestWorkItem
  //this debounces for 0.5 secs, you can configure it as per your requirement(debouncing time you want)
  DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(500), execute: requestWorkItem)
}

func getDataFromAPI() {
//your function which hits the API
}

希望这个有用。