一 Button的点击

1.1 新建UI -> Button

1.2  在Button上面右击添加空物体

1.3  创建脚本挂载到空物体上面

 脚本内容添加点击方法，来控制物体的显示隐藏

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.EventSystems;

public class NewMonoBehaviour : MonoBehaviour
{
   public GameObject player;//获取物体
    private bool isActivity = true;
    private void Awake()
    {
        player = GameObject.Find("Player");
    }

    // Start is called before the first frame update
    void Start()
    {
    }

    void Update()
    {
    }

    // 按钮点击事件
    public void OnMyClick()
    {
        isActivity = !isActivity;
        //显示或者隐藏
        player.SetActive(isActivity);
    }
}

1.4 按钮上On Click的位置关联空物体，并选择空物体的脚本方法OnMyClick()

1.5 运行后就可能控制物体显示隐藏了

二 方向键控制移动

2.1 添加四个方向按钮

 2.2 添加一个脚本，同时挂载到四个按钮上面

2.3 编写脚本，通过按钮名字判断是点击的哪个按钮，从而判断往哪个方向移动

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.EventSystems;

public class Controll : MonoBehaviour,IPointerDownHandler, IPointerUpHandler
{
    public Rigidbody2D rbody;//获取刚体

    private void Awake()
    {
 
        rbody = GameObject.Find("Player").GetComponent<Rigidbody2D>();
    }

    void Start()
    {
      
    }

    // Update is called once per frame
    void Update()
    {
        if (isMove) {
            move();
        }        
    }

    public bool isMove = false;//是否移动

    public void OnPointerDown(PointerEventData eventData)
    {
        isMove = true;
        getButton(eventData);
   
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        isMove = false;
    }

    //获取点击的哪个按钮，方向
    private void getButton(PointerEventData eventData) {
        GameObject gameObject = eventData.selectedObject;
        Debug.Log(gameObject.name);
        switch (gameObject.name) {
            case "ButtonUp":
                moveX = 0;
                moveY = 1;
                break;
            case "ButtonLeft":
                moveX = -1;
                moveY = 0;
                break;
            case "ButtonBottom":
                moveX = 0;
                moveY = -1;
                break;
            case "ButtonRight":
                moveX = 1;
                moveY = 0;
                break;
            default:
                moveX = 0;
                moveY = 0;
                break;
        }
    }

    /**
     * 移动
     **/
    public float speed = 10f;//移动速度
    private int moveX;//方向 -1左 1右
    private int moveY;//方向 -1上 1下
    public void move() {
       
        Vector2 position = rbody.position;
        position.x += moveX * speed * Time.deltaTime;
        position.y += moveY * speed * Time.deltaTime;
        //transform.position = position;
        rbody.MovePosition(position);
    }
}

2.4 运行可以看到物体可以往上下左右方法移动

2.5 总结：