Unity3D UGUI 制作摇杆Joystick

简单的UI制作

其中的ImageBg的锚点

其中的ImagePoint的锚点

代码

using UnityEngine;
using UnityEngine.EventSystems;

public class JoystickUI : UIBase
{
    private RectTransform ImageBg;
    private RectTransform ImagePoint;
    private float radius = 100;
    private Vector2 imageBackPos;
    private void Awake()
    {
        InitUI();
    }
    public override void InitUI()
    {
        ImageBg = GetComp("ImageBg");
        ImagePoint = GetComp("ImagePoint");
        imageBackPos = ImageBg.anchoredPosition;
        UIEvent.Get(gameObject).OnPointerDownCallBack = OnJoystickDown;
        UIEvent.Get(gameObject).OnDragCallBack = OnJoystickDrag;
        UIEvent.Get(gameObject).OnPointerUpCallBack = OnJoystickUp;
    }
    public void SetRadius(float radius)
    {
        this.radius = radius;
    }
    private void OnJoystickDown(PointerEventData e)
    {
        ImageBg.anchoredPosition = e.position;
    }
    private void OnJoystickDrag(PointerEventData e)
    {
        Vector2 vector2 = e.position - ImageBg.anchoredPosition;
        ImagePoint.anchoredPosition = vector2;
        if (vector2.magnitude > radius)
        {
            ImagePoint.anchoredPosition = vector2.normalized * radius;
        }
        //Debug.Log(ImagePoint.anchoredPosition.normalized.ToString());
        //Debug.Log(ImagePoint.anchoredPosition.magnitude / radius);
        //--callback
    }
    private void OnJoystickUp(PointerEventData e)
    {
        ImageBg.anchoredPosition = imageBackPos;
        ImagePoint.anchoredPosition = Vector2.zero;
    }
}

加一个回调，让控制的物体移动起来。

UIBase，UIEvent等在我的其他文章里写的，可以看看。

看这里有类似的，解决了一些问题。