Unity---自制游戲中控制角色的移動搖桿

目錄

• 1、搖桿界面制作
• 2、代碼

1、搖桿界面制作

簡單搖桿圖片下載
鏈接：https://pan.baidu.com/s/1H3V7Nw2tfGwO33S6ijwtvw
提取碼：7dtf

2、代碼

搖桿監聽事件，單獨寫一個類（可復用）

using System;
using UnityEngine;
using UnityEngine.EventSystems;

//后面三個為Unity的按下、按起、拖拽的事件接口

/// <summary>
/// 監聽事件腳本單獨寫出，使用時可以直接添加，提高復用性
/// </summary>
public class RockerListener : MonoBehaviour,IPointerDownHandler,IPointerUpHandler,IDragHandler
{
	//定義3個action委托
    public Action<PointerEventData> onPointerDown;
    public Action<PointerEventData> onPointerUp;
    public Action<PointerEventData> onDrag;

    //這三個事件分別在鼠標按下、鼠標抬起、鼠標拖拽時觸發
    public void OnPointerDown(PointerEventData eventData)
    {
        if (onPointerDown != null)
        {
            onPointerDown(eventData);
        }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        if (onPointerUp != null)
        {
            onPointerUp(eventData);
        }
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (onDrag != null)
        {
            onDrag(eventData);
        }
    }

}

掛載在搖桿上的具體類

using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class RockerTest : MonoBehaviour 
{
	//有效點擊區域、外搖桿、內搖桿
    private GameObject rockerRange;
    private GameObject clickOutImg;
    private GameObject clickInImg;

	//搖桿默認位置、點擊位置、內外搖桿最大距離差
    private Vector2 defaultPos;
    private Vector2 clickPos;
    private float maxDistance = 50;


    private void Start(){
        InitGO();
        InitListener();
	}
	private void Update(){
		
	}

    /// <summary>
    /// 初始化游戲物體對象
    /// </summary>
    private void InitGO()
    {
        rockerRange = this.gameObject;
        clickOutImg = transform.Find("clickOutImg").gameObject;
        clickInImg = transform.Find("clickOutImg/clickInImg").gameObject;
        defaultPos = clickOutImg.transform.position;
    }
    /// <summary>
    /// 初始化搖桿監聽事件
    /// </summary>
    private void InitListener()
    {
        RockerListener listener = GetOrAddComponent<RockerListener>(rockerRange);
        //鼠標按下時移動到按下的位置
        listener.onPointerDown = (PointerEventData data) =>
        {
            clickOutImg.transform.position = data.position;
            clickPos = data.position;
        };
        //抬起時回到原位
        listener.onPointerUp = (PointerEventData data) =>
        {
            clickOutImg.transform.position = defaultPos;
            clickInImg.transform.localPosition = Vector2.zero;
        };
        //拖拽時小搖桿在大搖桿的一定范圍內移動
        listener.onDrag = (PointerEventData data) =>
        {
            Vector2 dir = data.position - clickPos;
            float len = dir.magnitude;
            if (len >= maxDistance)
            {
                //限制內搖桿的最大移動距離
                Vector2 limitDistance = Vector2.ClampMagnitude(dir, maxDistance);
                clickInImg.transform.position = clickPos + limitDistance;
            }
            else
            {
                clickInImg.transform.position = data.position;
            }
        };
    }

    /// <summary>
    /// 得到或添加T組件到物體上（限制T范圍為component）
    /// </summary>
    private T GetOrAddComponent<T>(GameObject go) where T : Component
    {
        T t = go.GetComponent<T>();
        if (t == null)
        {
            t = go.AddComponent<T>();
        }

        return t;
    }
}