简单的虚拟摇杆控制移动（NGUI）

一、用NGUI创建虚拟摇杆贴图

先创建一个sprite作为背景叫做JoyStick 并添加一个BoxCollider，再创建一个sprite child作为虚拟摇杆中间的按钮，叫做button

二、通过虚拟摇杆获得x，y偏移值

using UnityEngine;
using System.Collections;

public class JoyStick : MonoBehaviour 
{

    private bool isPress = false;
    private Transform button;

    //从虚拟摇杆的得到的x，y偏移值-1到1之间
    public static float h = 0;
    public static float v = 0;
    void Awake()
    {
        button = transform.FindChild("button");
    }
    void OnPress(bool isPress)
    {
        this.isPress = isPress;
        if (!isPress)
        {
            button.localPosition = Vector2.zero;
            h = 0;
            v = 0;
        }
    }

    void Update()
    {
        if (isPress)
        {
            Vector2 touchPos = UICamera.lastEventPosition - new Vector2(91, 91);
            float distance = Vector2.Distance(Vector2.zero, touchPos);
            if (distance > 73)//虚拟摇杆按钮不能超过半径
            {
                touchPos = touchPos.normalized * 73;
            }            
            button.localPosition = touchPos;

            h = touchPos.x / 73;
            v = touchPos.y / 73;
        }
    }
}

三、通过偏移控制移动 主角添加了character controller

using UnityEngine;
using System.Collections;

public class PlayerMove : MonoBehaviour 
{
    private CharacterController cc;
    public float speed = 3f;

    void Awake()
    {
        cc = GetComponent<CharacterController>();
    }
    
    // Update is called once per frame
    void Update () 
    {
        //键盘控制
        float h = Input.GetAxis("Horizontal");
        float v = Input.GetAxis("Vertical");

        //虚拟摇杆控制
        if (JoyStick.h != 0 || JoyStick.v != 0)
        {
            h = JoyStick.h;
            v = JoyStick.v;
        }

        if (Mathf.Abs(h) > 0.1f || Mathf.Abs(v) > 0.1f)
        {
            Vector3 targetDir = new Vector3(h, 0, v);
            transform.LookAt(targetDir + transform.position);
            cc.SimpleMove(targetDir * speed);
        }

       
    }
}