cocos2dx3.2 谈谈精灵也能加入触摸事件回调函数简单使用，呢吗有木有更有的方法

在我点游戏界面中放置两个按钮：Start,Exit,代表开始游戏，和结束游戏，如下：

看到了吧，妹妹不错吧，嘿，百度搜的。。

那么怎么做到的呢？

首先导入资源ExitButton.jpg 和StartButton.jpg， 然后创建精灵如：

auto start = Sprite::create("StartButton.jpg");

start->setPosition(Vec2(start->getContentSize().width / 2 + 20,visibleSize.height / 2));

addChild(start);

接下来给创建事件监听器，并绑定回调函数：

auto startListener = EventListenerTouchOneByOne::create();

startListener->onTouchBegan =[&](cocos2d::Touch* touch,cocos2d::Event* event)

{

cocos2d::Vec2 p = touch->getLocation();

auto target = event->getCurrentTarget();

cocos2d::Rect rect = target->getBoundingBox(); // 判断触摸点是否在该按钮里面

if(rect.containsPoint(p))

{

return true; // to indicate that we have consumed it.

}

return false; // we did not consume this event,pass thru.

};

startListener->onTouchEnded = [=](cocos2d::Touch* touch,cocos2d::Event* event)

{

StartLayer::StartGame(nullptr); //开始游戏

};

最后将监听器加入事件分发器中，

Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(startListener,start);

这样就ok了，另一个退出按钮的实现也按照同样的方法。

这个是一般的方法，但是缺点比较明显，就是添加了许多东西，接下来我要介绍另一种方法，我将其封装到自定义到精灵中如下：

CustomSprite.h头文件

//

// CustomSprite.h

// DontSaveMe

// Created by Mr Gan on 12/23/14.

//

#ifndef __DontSaveMe__CustomSprite__

#define __DontSaveMe__CustomSprite__

#include "cocos2d.h"

#include <string>

#include <stdio.h>

#include <functional>

USING_NS_CC;

class CustomSprite : public Sprite

{

public:

virtual ~CustomSprite(){}

static CustomSprite* createWithPath(const std::string &path);

std::function<bool(Touch*,Event*)> onTouchBegan;

std::function<void(Touch*,Event*)> onTouchMoved;

std::function<void(Touch*,Event*)> onTouchEnded;

std::function<void(Touch*,Event*)> onTouchCancelled;

protected:

CustomSprite():onTouchBegan(nullptr),onTouchEnded(nullptr) {}

virtual bool initWithFile(const std::string& filename) override;

};

#endif /* defined(__DontSaveMe__CustomSprite__) */

// CustomSprite.cpp

//

#include "CustomSprite.h"

CustomSprite *CustomSprite::createWithPath(const std::string &path)

{

auto sprite = new CustomSprite();

if(sprite && sprite->initWithFile(path))

{

sprite->autorelease();

return sprite;

}

else

{

delete sprite;

sprite = nullptr;

return nullptr;

}

}

bool CustomSprite::initWithFile(const std::string& filename)

{

if(!Sprite::initWithFile(filename))

{

return false;

}

auto listener = cocos2d::EventListenerTouchOneByOne::create();

listener->setSwallowTouches(true);

listener->onTouchBegan = [&](cocos2d::Touch* touch,cocos2d::Event* event)

{

cocos2d::Vec2 p = touch->getLocation();

cocos2d::Rect rect = this->getBoundingBox();

if(rect.containsPoint(p))

{

if(onTouchBegan)

onTouchBegan(touch,event);

return true; // to indicate that we have consumed it.

}

};

listener->onTouchEnded = [=](cocos2d::Touch* touch,cocos2d::Event* event)

{

if(onTouchEnded)

onTouchEnded(touch,event);

};

cocos2d::Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener,this);

return true;

}

怎么用呢很简单如下：

auto start = CustomSprite::createWithPath("StartButton.jpg");

start->setPosition(Vec2(start->getContentSize().width / 2 + 20,visibleSize.height / 2));

start->onTouchEnded = CC_CALLBACK_2(StartLayer::onBeginTouchStartButton,this);

addChild(start);

auto exit = CustomSprite::createWithPath("ExitButton.jpg");

exit->setPosition(Vec2(start->getPositionX(),start->getPositionY() - 70));

exit->onTouchEnded = CC_CALLBACK_2(StartLayer::onBeginTouchExitButton,this);

addChild(exit);

在定义onBeginTouchStartButton，和onBeginTouchExitButton

void StartLayer::onBeginTouchStartButton(Touch* touch,Event* event)

{

StartGame(nullptr);

}

void StartLayer::onBeginTouchExitButton(Touch* touch,Event* event)

{

ExitGame);

}

这样就ok啦，可别忘了在头文件添加其引用，到此结束，希望能帮到一些小忙。