Cocos2d中添加手势支持的三种方法

概述最近一直琢磨在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 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

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

- (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。

//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：

        //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：

-(voID) longPress:(UIGestureRecognizer *) recognizer node:(CCNode *) node{    cclOG(@"%s",__FUNCTION__);}

3)需要支持协议UIGestureRecognizerDelegate 头文件如下：

#import "cocos2d.h"// HelloWorldLayer@interface HelloWorldLayer : cclayer<UIGestureRecognizerDelegate>{}// returns a CCScene that contains the HelloWorldLayer as the only child+(CCScene *) scene;-(voID) longPress:(UIGestureRecognizer *) recognizer node:(CCNode *) node;@end

第三种，自己琢磨的一种办法，个人感觉也还不错。

1)默认情况下面，cocos2d 模板并没有在AppDelegate里面包含一个RootVIEwController的属性，因此必须手动添加一个：
跳转到AppDelegate.h文件，并添加下面的代码：

@property (nonatomic,retain) RootVIEwController*vIEwController;

然后跳转到AppDelegate.m，@synthesize之：

@synthesize vIEwController; 

2)在场景或者层中m文件中，#import "AppDelegate.h"

+(ID) scene{	//给层添加手势支持	CCScene *scene = [CCScene node];		// 'layer' is an autorelease object.	HelloWorld *layer = [HelloWorld node];		UIPanGestureRecognizer *gestureRecognizer = [[[UIPanGestureRecognizer alloc] initWithTarget:layer action:@selector(handlePanFrom:)] autorelease];    	AppDelegate *delegate=(AppDelegate *)[UIApplication sharedApplication].delegate;	[delegate.vIEwController.vIEw addGestureRecognizer:gestureRecognizer];		// add layer as a child to scene	[scene addChild: layer];		// return the scene	return scene;}//手势识别函数- (voID)handlePanFrom:(UIPanGestureRecognizer *)recognizer {        if (recognizer.state == UIGestureRecognizerStateBegan) {                    CGPoint touchLocation = [recognizer locationInVIEw:recognizer.vIEw];        touchLocation = [[CCDirector sharedDirector] convertToGL:touchLocation];        touchLocation = [self convertToNodeSpace:touchLocation];                        //实现的效果..             } else if (recognizer.state == UIGestureRecognizerStateChanged) {                    CGPoint translation = [recognizer translationInVIEw:recognizer.vIEw];        translation = ccp(translation.x,-translation.y);        //实现的效果..         [recognizer setTranslation:CGPointZero inVIEw:recognizer.vIEw];                } else if (recognizer.state == UIGestureRecognizerStateEnded) {                //实现的效果..                    }        } 

以上是本人总结的三种在Cocos2d里添加手势支持的方法，不妥之处欢迎各位指教！

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