import androidx.recyclerview.widget.LinearSmoothScroller
import androidx.recyclerview.widget.RecyclerView

/**

• 滑动到指定位置，并使指定位置位于列表最上面
  */
  fun RecyclerView.scrollItemToTop(position: Int) {
  val smoothScroller: LinearSmoothScroller = object : LinearSmoothScroller(context) {
  override fun getVerticalSnapPreference(): Int {
  return SNAP_TO_START
  }
  }
  smoothScroller.targetPosition = position
  layoutManager?.startSmoothScroll(smoothScroller)
  }