Cocos2d中添加手势支持的三种方法

最近一直琢磨在Cocos2d里添加手势的功能，找了一些资料加上自己的理解，整理出了三种方法和大家分享。

第一种，很简单，就是知易cocos2d-iPhone教程-04所介绍的（其实这并不是真正的手势，只是也能实现部分手势功能而已），代码如下：

1）单击、双击处理

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- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    //Get all the touches.
    NSSet *allTouches = [event allTouches];
    //Number of touches on the screen
    switch ([allTouches count])
    {
        case 1:
        {
            //Get the first touch.
            UITouch *touch = [[allTouches allObjects] objectAtIndex:0];
            switch([touch tapCount])
            {
                case 1://Single tap
                    // 单击！！
                    break;
                case 2://Double tap.
                    // 双击！！
                    break; }
            }
            break;
        }
    }
}
2）两个指头的分开、合拢手势。

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//计算两个点之间的距离函数
- (CGFloat)distanceBetweenTwoPoints:(CGPoint)fromPoint toPoint:(CGPoint)toPoint
{
    float x = toPoint.x - fromPoint.x;
    float y = toPoint.y - fromPoint.y;
    return sqrt(x * x + y * y);
}

//记录多触点之间的初始距离
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSSet *allTouches = [event allTouches];
    switch ([allTouches count])
    {
        case 1: { //Single touch
            break;}
        case 2: { //Double Touch
            //Track the initial distance between two fingers.
            UITouch *touch1 = [[allTouches allObjects] objectAtIndex:0];
            UITouch *touch2 = [[allTouches allObjects] objectAtIndex:1];
            initialDistance = [self distanceBetweenTwoPoints:[touch1 locationInView:[self view]] toPoint:[touch2 locationInView:[self view]]];
            }
            break;
        default:
            break;
    }
}

//两个指头移劢时，判断是分开还是合拢
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSSet *allTouches = [event allTouches];
    switch ([allTouches count])
    {
        case 1:
            break;
        case 2:{
            UITouch *touch1 = [[allTouches allObjects] objectAtIndex:0];
            UITouch *touch2 = [[allTouches allObjects] objectAtIndex:1];
            //Calculate the distance between the two fingers.
            CGFloat finalDistance = [self distanceBetweenTwoPoints: [touch1 locationInView:[self view]] toPoint:[touch2 locationInView:[self view]]];
            //Check if zoom in or zoom out.
            if(initialDistance > finalDistance) {
                NSLog(@"Zoom Out"); // 合拢！！
            }
            else {
                NSLog(@"Zoom In"); // 分开！！
            }
            }
            break;
    }
}
第二种，是在Cocoa China中找的一种办法，它的原理是通过修改CCLayer，CCNode两个Cocos2d类的源码实现手势支持：

1.首先要修改两个Cocos2d类的源码分别为CCLayer，CCNode

2.增加手势类源码 CCGestureRecognizer

以上三个类的源码，可以在我的资源中找着（地址：http://download.csdn.net/detail/wangqiuyun/4460442），(记住CCLayer与CCNode要覆盖原来的文件)
CCGestureRecognizer.h与.m要拷贝到当前工程的libs/cocos2d/Platforms/iOS目录下
在工程文件中加入CCGestureRecognizer.h与.m

3.完成以上工作后所有Node的子类中都可以使用手势了，如在HelloWorld工程中：

1)修改HelloWorldLayer.m中的init方法加入以下代码：

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//定义响应的手势类(支持所有UI手势)
UILongPressGestureRecognizer * longPress = [[[UILongPressGestureRecognizer alloc] init] autorelease];
longPress.minimumPressDuration = 0.5f;
longPress.allowableMovement = 5.0f;
//将UI手势对象longPress作为CCGestureRecognizer类的初始化参数
//@selector(longPress:node:) 为响应手势的触发方法
CCGestureRecognizer * rescognizer = [CCGestureRecognizer CCRecognizerWithRecognizerTargetAction:longPress target:self action:@selector(longPress:node:)];
//设置手势类的代理
rescognizer.delegate = self;
//为self (当前为CCLayer对象)注册手势
[self addGestureRecognizer:rescognizer];
//必须设置self可接收Touch事件
self.isTouchEnabled = YES;
2)另需要增加响应方法的实现：

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-(void)

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