据说

Temple Run（神庙逃亡）

就是用这种方式操作的

废话不多说

直接上代码

using UnityEngine;
using System.Collections;

public class Touch : MonoBehaviour
{
    private Vector2 beginPos;
    // Use this for initialization
    void Start()
    {
    }

    // Update is called once per frame
    void Update()
    {
        TouchDirection();
    }

    void TouchDirection()
    {
        if (Input.touchCount <= 0)
            return;

        if (Input.touchCount == 1)
        {
            if (Input.touches[0].phase == TouchPhase.Began)
            {
                beginPos = Input.touches[0].positon;
            }
            else if (Input.touches[0].phase == TouchPhase.Moved)
            {
            }

            if (Input.touches[0].phase == TouchPhase.Ended && Input.touches[0].phase != TouchPhase.Canceled)
            {
                Vector2 pos = Input.touches[0].position;
                if (Mathf.Abs(beginPos.x = pos.x) > Mathf.Abs(beginPos.y = pos.y))
                {
                    if (beginPos.x > pos.x)
                    {
                        //向左
                    }
                    else
                    {
                        //向右
                    }
                }
                else
                {
                    if (beginPos.y > pos.y)
                    {
                        //向下
                    }
                    else
                    {
                        //向上
                    }
                }
            }
        }
    }
}

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