操纵杆UI不关注播放器/相机

Question

我的屏幕上的操纵杆正好工作在屏幕上...除了它脱离屏幕。我对团结非常陌生，只知道我正在通过Google/YouTube教程做什么，但是Google/YouTube这次无济于事！ （可能是由于我使用可怕的术语）。请给我建议！谢谢你！

我尝试的是：

我尝试了所有3种画布渲染模式 - 无济于事。 我小时候尝试了操纵杆，摄影机等 -

这是我问题的GIF： https://gfycat.com/plasticperiodic flyingsquirrel

这是我的代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Joystick : MonoBehaviour
{
    public Transform player;
    public float speed = 5.0f;
    private bool touchStart = false;
    private Vector2 pointA;
    private Vector2 pointB;
    public Transform circle;
    public Transform outerCircle;
    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            pointA = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.transform.position.z));
            circle.transform.position = pointA * 1;
            outerCircle.transform.position = pointA * 1;
            circle.GetComponent<SpriteRenderer>().enabled = true;
            outerCircle.GetComponent<SpriteRenderer>().enabled = true;
        }
        if (Input.GetMouseButton(0))
        {
            touchStart = true;
            pointB = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.transform.position.z));
        }
        else
        {
            touchStart = false;
        }
    }
    private void FixedUpdate()
    {
        if (touchStart)
        {
            Vector2 offset = pointB - pointA;
            Vector2 direction = Vector2.ClampMagnitude(offset, 1.0f);
            moveCharacter(direction * 1);
            circle.transform.position = new Vector2(pointA.x + direction.x, pointA.y + direction.y) * 1;
        }
        else
        {
            circle.GetComponent<SpriteRenderer>().enabled = false;
            outerCircle.GetComponent<SpriteRenderer>().enabled = false;
        }
    }
    void moveCharacter(Vector2 direction)
    {
        player.Translate(direction * speed * Time.deltaTime);
    }
}