[Unity2d系列教程] 005.Unity如何使用外部触控插件FingerGuesture

用过Unity的都知道自带的Input.touches并不支持鼠标输入，给我们的调试带来很大的不方便。那么我们会发现其实有很多触控方面的插件，如inputtouches，easy touch，fingerGesture等。

下面我主要讲解FingerGesture的使用，这个插件不是免费的，可以自行购买

1.导入插件

导入后的插件会在Assets/Plugins下面

2.拖动Assets/Plugins/FingerGestures/Prefabs/FingerGestures到你的Hierarchy中，如下图

3.创建空节点GestureObj，然后绑定脚本TestGesture.cs

using UnityEngine;
using System.Collections;

public class testGestures : MonoBehaviour
{

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {

    }

    // 单击
    void OnTap(TapGesture gesture)
    {
        if (gesture.Selection == tapObject)
        {
            Debug.Log("Tab!!!!!!!!!!!");
        }
    }

    // 双击
    void OnDoubleTap(TapGesture gesture)
    {
        if (gesture.Selection == doubleTapObject)
        {
            Debug.Log("Double Tab!!!!!!!!!!!");
        }
    }

    void OnSwipe(SwipeGesture gesture)
    {
        // make sure we started the swipe gesture on our swipe object
        //   we use the object the swipe started on, instead of the current one
        GameObject selection = gesture.StartSelection;

        if (selection == swipeObject)
        {
            Debug.Log("Swipe!!!!!!!");
        }
    }

    int dragFingerIndex = -;
    void OnDrag(DragGesture gesture)
    {
        // 获取起始点
        FingerGestures.Finger finger = gesture.Fingers[];

        if (gesture.Phase == ContinuousGesturePhase.Started)
        {
            // dismiss this event if we're not interacting with our drag object
            if (gesture.Selection != dragObject)
                return;

            // remember which finger is dragging dragObject
            dragFingerIndex = finger.Index;
        }
        else if (finger.Index == dragFingerIndex)  // gesture in progress, make sure that this event comes from the finger that is dragging our dragObject
        {
            if (gesture.Phase == ContinuousGesturePhase.Updated)
            {
                // update the position by converting the current screen position of the finger to a world position on the Z = 0 plane
                dragObject.transform.position = GetWorldPos(gesture.Position);
            }
            else
            {
                // reset our drag finger index
                dragFingerIndex = -;
            }
        }
    }

    // 长按
    void OnLongPress(LongPressGesture gesture)
    {
        if (gesture.Selection == longPressObject)
        {
            Debug.Log("Long press！！！！！！");
        }
    }
    // 定义变量，用来操作
    public GameObject longPressObject;
    public GameObject tapObject;
    public GameObject doubleTapObject;
    public GameObject swipeObject;
    public GameObject dragObject;

    // 公共方法
    public static Vector3 GetWorldPos(Vector2 screenPos)
    {
        Ray ray = Camera.main.ScreenPointToRay(screenPos);

        // we solve for intersection with z = 0 plane
        float t = -ray.origin.z / ray.direction.z;

        return ray.GetPoint(t);
    }
}

4.添加指定的触控对象

5.添加Component

6.添加Screen Raycaster

7.要为对象添加2D物理碰撞区域。不然的话点击没有效果。