1、首先我们先定义一个枚举，用来表示手势滑动的四个方向：

<span style="font-size:14px;">public enum TouchDirection
{ Unkown,Left,Right,Up,Down
}</span>

2、定义类：TouchInput

<span style="font-size:14px;">public class TouchInput : MonoBehaviour {public static TouchInput instance;private Vector2 touchBeginPos;private Vector2 touchEndPos;
}
</span>

3、对instance进行初始化：

<span style="font-size:14px;">void Start () {Init();}void Init(){if (instance == null){instance = this;}}</span>

4、编写根据Touch计算滑动方向：

<span style="font-size:14px;">public TouchDirection GetTouchMoveDirection(){if (Input.touchCount > 0){TouchDirection dir = TouchDirection.Unkown;if (Input.touches[0].phase != TouchPhase.Canceled){switch (Input.touches[0].phase){ case TouchPhase.Began:touchBeginPos = Input.touches[0].position;break;case TouchPhase.Ended:touchEndPos = Input.touches[0].position;if (Mathf.Abs(touchBeginPos.x - touchEndPos.x) > Mathf.Abs(touchBeginPos.y - touchEndPos.y)){if (touchBeginPos.x > touchEndPos.x){dir = TouchDirection.Left;}else{dir = TouchDirection.Right;}}else{if (touchBeginPos.y > touchEndPos.y){dir = TouchDirection.Down;}else{dir = TouchDirection.Up;}}break;}}return dir;}else{return TouchDirection.Unkown;}}</span>

5、使用方法：

首先，我们必须把我们写好的TouchInput脚本挂在物体上实例，在需要用到的地方应用：

void Update () {TouchInputTest();}
void TouchInputTest(){switch (TouchInput.instance.GetTouchMoveDirection()){case TouchDirection.Up:Debug.Log("Up");break;case TouchDirection.Down:Debug.Log("Down");break;case TouchDirection.Left:Debug.Log("Left");break;case TouchDirection.Right:Debug.Log("Right");break;}}

这样不论在什么地方，只要我们需要，我们就可以实例TouchInput.instance，进而拿到我们的滑动方向。