但我们开发移动端的游戏时，发现使用Input.GetMouseButtonDown的方法不可用，怎么办？
虽然unity3d也有自带触屏的方法，但是使用起来代价太高，什么单击，双击这些功能都要自己封装。
下面我们来讲下EasyTouch这个插件，它将所有触屏的手势，都已经写好了。
而且Easytouch也支持NGUI，使用起来十分的方便。
接下来，我们详细地学习这个插件改如何运用到我们的项目中来。
首先，我们导入easytouch插件，这里我是用3.0版本的，可能有些老了，我都没更新，但是大致的功能实际上是完全可以胜任了。
创建easytouch的步骤：
1.
这里我使用的c#的脚本，js我不太熟悉。
2.完了之后你们会看到在scene中会出现
EasyTouch。
3.新建一个c#脚本，来实现简单的触屏逻辑，这里注意一下，easytouch支持在editor下面进行测试，不用再发送到真机上。这也大大简化了开发者的工作。所以个人强烈推荐这个插件。
我们取名为TouchTest，
using UnityEngine;
using System.Collections;
public class TouchTest : MonoBehaviour {
// Subscribe to events
void OnEnable(){
EasyTouch.On_TouchStart += On_MyTouchStart;//启动On_TouchStart监听，也就是手指接触屏幕，就会触发On_MyTouchStart的方法执行
}
// Unsubscribe
void OnDisable(){
EasyTouch.On_TouchStart -= On_MyTouchStart;//去除监听
}
// Unsubscribe
void OnDestroy(){
EasyTouch.On_TouchStart -= On_MyTouchStart;//去除监听
}
// Touch start event
public void On_MyTouchStart(Gesture gesture){
Debug.Log( "Touch in " + gesture.position);//打印触摸到屏幕的坐标Vector2
}
}
写好代码之后，我们新建一个GameObject，然后把脚本赋值给这个物体。
启动demo，观察效果。
大致步骤就是如此，我们发现我们只是测试一个On_TouchStart,在easytouch的API中封装了好多手势的方法：
On_Cancel( Gesture gesture)
Occurs when The system cancelled tracking for the touch, as when (for example) the user puts the device to her face.
On_Cancel2Fingers( Gesture gesture)
Occurs when the touch count is no longer egal to 2 and different to 0, after the begining of a two fingers gesture.
On_TouchStart( Gesture gesture)
Occurs when a finger touched the screen.
On_TouchDown( Gesture gesture)
Occurs as the touch is active.
On_TouchUp( Gesture gesture)
Occurs when a finger was lifted from the screen.
On_SimpleTap( Gesture gesture)
Occurs when a finger was lifted from the screen, and the time elapsed since the beginning of the touch is less than
the time required for the detection of a long tap.
On_DoubleTap( Gesture gesture)
Occurs when the number of taps is egal to 2 in a short time.
On_LongTapStart( Gesture gesture)
Occurs when a finger is touching the screen, but hasn’t moved since the time required for the detection of a long tap.
On_LongTap( Gesture gesture)
Occurs as the touch is active after a LongTapStart
On_LongTapEnd( Gesture gesture)
Occurs when a finger was lifted from the screen, and the time elapsed since the beginning of the touch is more than
the time required for the detection of a long tap.
On_DragStart( Gesture gesture)
Occurs when a drag start. A drag is a swipe on a pickable object
On_Drag( Gesture gesture)
Occurs as the drag is active.
On_DragEnd( Gesture gesture)
Occurs when a finger that raise the drag event , is lifted from the screen.
On_SwipeStart( Gesture gesture)
Occurs when swipe start.
On_Swipe( Gesture gesture)
Occurs as the swipe is active.
On_SwipeEnd( Gesture gesture)
Occurs when a finger that raise the swipe event , is lifted from the screen.
On_TouchStart2Fingers( Gesture gesture)
Like On_TouchStart but for a 2 fingers gesture.
On_TouchDown2Fingers( Gesture gesture)
Like On_TouchDown but for a 2 fingers gesture.
On_TouchUp2Fingers( Gesture gesture)
Like On_TouchUp but for a 2 fingers gesture.
On_SimpleTap2Fingers( Gesture gesture)
Like On_SimpleTap but for a 2 fingers gesture.
On_DoubleTap2Fingers( Gesture gesture)
Like On_DoubleTap but for a 2 fingers gesture.
On_LongTapStart2Fingers( Gesture gesture)
Like On_LongTapStart but for a 2 fingers gesture.
On_LongTap2Fingers( Gesture gesture)
Like On_LongTap but for a 2 fingers gesture.
On_LongTapEnd2Fingers( Gesture gesture)
Like On_LongTapEnd but for a 2 fingers gesture.
On_Twist( Gesture gesture)
Occurs when a twist gesture start
On_TwistEnd( Gesture gesture)
Occurs as the twist gesture is active.
On_PinchIn( Gesture gesture)
Occurs as the twist in gesture is active.
On_PinchOut( Gesture gesture)
Occurs as the pinch out gesture is active.
On_PinchEnd( Gesture gesture)
Occurs when the 2 fingers that raise the pinch event , are lifted from the screen.
On_DragStart2Fingers( Gesture gesture)
Like On_DragStart but for a 2 fingers gesture.
On_Drag2Fingers( Gesture gesture)
Like On_Drag but for a 2 fingers gesture.
On_DragEnd2Fingers( Gesture gesture)
Like On_DragEnd2Fingers but for a 2 fingers gesture.
On_SwipeStart2Fingers( Gesture gesture)
Like On_SwipeStart but for a 2 fingers gesture.
On_Swipe2Fingers( Gesture gesture)
Like On_Swipe but for a 2 fingers gesture.
On_SwipeEnd2Fingers( Gesture gesture)
Like On_SwipeEnd but for a 2 fingers gesture.
这里我就不一一测试了，有兴趣的童鞋可以去官方的demo看看。
接着我们来看看easytouch的属性表：
Enable EasyTouch------->是否启用easytouch，否则所有的触屏效果消失。
Enable unity remote-------->是否启用Unity Remote，这个是啥东西呢，他是Unity开发移动游戏的辅助工具，就是在你的手机上安装这个app或apk，然后通过
数据线连接到你的电脑上，当你的unity要build 发布的时候，他就会自动在你的手机上测试，不用再build完之后发到手机上，再打开测试。
就是这个小东东：
Broadcast Messages-------------------->是否启动Unity里面的SendMessage的机制，不熟悉这个的童鞋自己研究，其实也蛮好理解的。
就是向同级发送消息，在这个游戏物体上的所有MonoBehaviour上调用名称为methodName的方法，比如在Test1.cs脚本里面，我们有一个方法：
getMessage(string str)
{
print("receive message:"+str);//打印收到的消息
}
然后在Test2.cs里面，我们调用
string s = "send message";
SendMessage("getMessage",s);
运行就会收到消息。
好了我们回到easytouch，再看看参数
Ohter Receiver------------------>赋值一个object，允许你直接把消息发送到这个object上。
Joysticks & buttons--------------->是否启动Joysticks（虚拟遥控）（这个我们的以后再研究 ）& buttons（按钮）