Cocos2d-x实战项目开发：加法计算器

其实完成加法计算器很简单，大概分成三个步骤：
1.设计界面
2.用户交互
3.计算结果

大家一看代码便知，不懂得可以在评论区中问我！

HelloWorld.h代码：

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

class HelloWorld : public cocos2d::Layer
{
private:
        cocos2d::TextFieldTTF *aTF, *bTF;
        cocos2d ::Label  * resultLabel,*addBtn;

public:
static cocos2d::Scene* createScene();

virtual bool init();

// a selector callback
void menuCloseCallback(cocos2d::Ref* pSender);
void bulidUI();
void addListeners();

// implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
};

#endif // __HELLOWORLD_SCENE_H__

HelloWorld.cpp的代码：

#include "HelloWorldScene.h"


USING_NS_CC;

Scene* HelloWorld::createScene()
{
// 'scene' is an autorelease object
    auto scene = Scene::create();

// 'layer' is an autorelease object
    auto layer = HelloWorld::create();

// add layer as a child to scene
    scene->addChild(layer);

// return the scene
return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !Layer::init() )
    {
return false;
    }

    bulidUI();
    addListeners();

return true;
}

void HelloWorld::bulidUI()//布局
{
    aTF = TextFieldTTF::textFieldWithPlaceHolder("value", "Courier", 25);
    aTF->setPosition(100,200);
    addChild(aTF);

    auto addLabel = Label::create();
    addLabel->setString("+");
    addLabel->setSystemFontSize(25);
    addLabel->setPosition(aTF->getPositionX()+50,aTF->getPositionY());
    addChild(addLabel);

    bTF = TextFieldTTF::textFieldWithPlaceHolder("value","Courier",25);
    bTF->setPosition(aTF->getPositionX() + 100, aTF->getPositionY());
    addChild(bTF);

    auto equalLabel = Label::create();
    equalLabel->setString("=");
    equalLabel->setSystemFontSize(25);
    equalLabel->setPosition(aTF->getPositionX()+150,aTF->getPositionY());
    addChild(equalLabel);

    resultLabel = Label::create();
    resultLabel->setSystemFontSize(25);
    resultLabel->setPosition(equalLabel->getPositionX()+50,equalLabel->getPositionY());
    addChild(resultLabel);

    addBtn = Label::create();
    addBtn->setString("ADD");
    addBtn->setSystemFontSize(25);
    addBtn->setPosition(aTF->getPositionX(),aTF->getPositionY()-50);
    addChild(addBtn);
}

void HelloWorld::addListeners()//交互
{
    auto director = Director::getInstance();//获取导演类对象
    auto handler = [=](Touch *t, Event *e)
 {
 auto target = e->getCurrentTarget();
 if (target->getBoundingBox().containsPoint(t->getLocation()))
 {
 if (aTF == target)
 aTF->attachWithIME();
 else if (bTF == target)
 bTF->attachWithIME();
 else if (addBtn == target)
 {
 int a = __String::create(aTF->getString())->intValue();
 int b = __String::create(bTF->getString())->intValue();
 resultLabel->setString(StringUtils::format("%d",a+b));
 }

 }
 return false;
 };
 auto addListenerToTarget = [director, handler](Node * target)
 {
 auto l = EventListenerTouchOneByOne::create();//创建事件监听器
 l->onTouchBegan = handler;
 director->getEventDispatcher()->addEventListenerWithSceneGraphPriority(l,target);
 };
 addListenerToTarget(aTF);
 addListenerToTarget(bTF);
 addListenerToTarget(addBtn);
}

void HelloWorld::menuCloseCallback(Ref* pSender)
{
 Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
 exit(0);
#endif
}

运行结果如下：