我个人认为此方法相比于第一种更简洁一点

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class Smoothmove : MonoBehaviour
{

	[Range(0.0f, 10.0f)]//***
    [HideInInspector]
	public float moveSpeed = 2.0f;//图片移动速度
	/// <summary>
	/// 显示上拉框的位置
	/// </summary>
	private Vector2 showupPos;
	/// <summary>
	/// 隐藏上拉框的位置
	/// </summary>
	private Vector2 hideupPos;
	/// <summary>
	/// 记录上拉框图片位置
	/// </summary>
	private RectTransform _upTransfrom;
	private bool _isShow;
	/// <summary>
	/// 显示左拉框的位置
	/// </summary>
	private Vector2 showleftPos;
	/// <summary>
	/// 隐藏左拉框的位置
	/// </summary>
	private Vector2 _hideleftPos;
	/// <summary>
	/// 记录左拉框图片位置
	/// </summary>
	private RectTransform _leftTransfrom;
	/// <summary>
	/// 判断是否移动到上面的菜单栏区域
	/// </summary>
	bool _up;
	bool _left;
	private RectTransform uparea;
	private RectTransform leftarea;
	void Start()
	{
		uparea = GameObject.Find("moveup").gameObject.GetComponent<RectTransform>();
		leftarea = GameObject.Find("moveleft").gameObject.GetComponent<RectTransform>();
		
		_up = false;
	
		_left=false;


		_upTransfrom = GameObject.Find("Scroll View H").gameObject.GetComponent<RectTransform>();//因为代码挂在上拉框上，直接获取上拉框初始位置
		showupPos = _upTransfrom.anchoredPosition;//初始显示位置
		hideupPos = new Vector2( showupPos.x,showupPos.y + 300);//隐藏时移动到的位置，垂直移动
																					 //_isShow = false;
		_leftTransfrom = GameObject.Find("di").gameObject.GetComponent<RectTransform>();//di是左拉框
		showleftPos = _leftTransfrom.anchoredPosition;//初始显示位置
		_hideleftPos = new Vector2(showleftPos.x -300, showleftPos.y);//隐藏时移动到的位置，水平移动
	}
	void Update()
	{
		_up = RectTransformUtility.RectangleContainsScreenPoint(uparea, Input.mousePosition);
		_left = RectTransformUtility.RectangleContainsScreenPoint(leftarea, Input.mousePosition);

		if (_up)
        {
			ShowMenu();
        }
		if (_left)
		{
			 Showleft();
		}
		
		
	}
	/// <summary>
	/// 调用显示上侧携程，可在别处调用此函数来显示菜单
	/// </summary>
	public void ShowMenu()
	{
		StartCoroutine(Appear());
	}
	/// <summary>
	/// 显示上侧菜单
	/// </summary>
	/// <returns></returns>
	IEnumerator Appear()
	{
		float time = Time.time;
		float timeDiff = 0;
		while (timeDiff < 1)
		{
			timeDiff = (Time.time - time) * moveSpeed;
			Vector2 currentPos = Vector2.Lerp(showupPos, hideupPos, timeDiff);
			_upTransfrom.anchoredPosition = currentPos;
			yield return new WaitForEndOfFrame();
		}

		//_isShow = true;
	}
	/// <summary>
	/// 调用显示左拉框的携程
	/// </summary>
	public void Showleft()
	{
		StartCoroutine(Appearleft());
	}
	
	/// <summary>
	/// 显示左拉框的携程
	/// </summary>
	/// <returns></returns>
	IEnumerator Appearleft()
	{

		float time = Time.time;
		float timeDiff = 0;

		while (timeDiff < 1)
		{
			timeDiff = (Time.time - time) * moveSpeed;
			Vector2 currentPos = Vector2.Lerp(showleftPos, _hideleftPos, timeDiff);
			_leftTransfrom.anchoredPosition = currentPos;

			yield return new WaitForEndOfFrame();//***
		}

		_isShow = true;
	}
}

这是通过检测UI区域来实现的，还有一种方法在另一篇文章