using System.Collections;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
 
public class MyJoystick : MonoBehaviour, IPointerDownHandler, IPointerUpHandler {
 
 public Canvas canvas;
 public static float h;  //h和v的值传回给player脚本，使得物体移动
 public static float v;
 
 private bool isPress = false; //Button按钮是否按下
 private Vector2 touchPos = Vector2.zero; //按下的位置
 
 void Update() {
  if (isPress)
  {
   RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform,
    Input.mousePosition, null, out touchPos);
 
   //根据Canvas和Image的Rectransform位置相减得出
   touchPos += new Vector2(427, 299); 
 
   float distance = Vector2.Distance(Vector2.zero, touchPos);
 
   if (distance > 52) { //限制Button不能超出Image位置（两者位置相减得出52）
    touchPos = touchPos.normalized*52;
    transform.localPosition = touchPos;
   }
   else
   {
    transform.localPosition = touchPos;
   }
 
   h = touchPos.x / 52;
   v = touchPos.y / 52;
  }
 
 }
 
 //鼠标按下时触发
 public void OnPointerDown(PointerEventData eventData) {
  isPress = true;
 }
 
 //鼠标按键弹起时触发
 public void OnPointerUp(PointerEventData eventData)
 {
  isPress = false;
  transform.localPosition = Vector3.zero;
 }
 
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class PlayerMove : MonoBehaviour {
 
 public float speed = 0.1f;
 
 private float h = 0;
 private float v = 0;
 
 void Update() {
  //首先检测虚拟按键有没有移动，没有再选择键盘输入
  if (Mathf.Abs(MyJoystick.h) > 0 || Mathf.Abs(MyJoystick.v) > 0) {
   h = MyJoystick.h;
   v = MyJoystick.v;
  }
  else{
   h = Input.GetAxis("Horizontal");
   v = Input.GetAxis("Vertical");
  }
  //玩家位置移动
  if (Mathf.Abs(h) > 0.1 || Mathf.Abs(v) > 0.1) {
   Vector3 targetDir = new Vector3(h, 0, v);
   transform.position += targetDir * speed;
 
   transform.LookAt(transform.position+targetDir);
  }
  
 }
}