Cocos2d-x 3.6 项目实战---贪吃蛇（2）

#ifndef __snakegame__HelpScene__
#define __snakegame__HelpScene__
#include "cocos2d.h"
USING_NS_CC;
class Help :public Layer
{
public:
static Scene * createScene();
CREATE_FUNC(Help);
virtual bool init();
void menuCallBack(Ref * object);
};
#endif /* defined(__snakegame__HelpScene__) */

#include "HelpScene.h"
#include "MainMenu.h"

Scene * Help::createScene()
{
auto scene = Scene::create();
auto layer = Help::create();
scene->addChild(layer);
return scene;
}

bool  Help::init()
{
if (!Layer::init())
{
return  false;
}
auto size = Director::getInstance()->getWinSize();
//添加背景
auto spriteBK = Sprite::create("menuback.png");
spriteBK->setPosition(Point(size.width / 2, size.height / 2));
spriteBK->setOpacity(70);//设置透明度
this->addChild(spriteBK);
//帮助信息
auto labelScore = Label::createWithSystemFont("帮助信息", "宋体", 25);
labelScore->setPosition(Point(size.width - 80, size.height - 50));
this->addChild(labelScore);
//返回按钮
auto menuItemBack = MenuItemFont::create("Back", CC_CALLBACK_1(Help::menuCallBack, this));
auto menu = Menu::create(menuItemBack, NULL);
menu->setPosition(Point::ZERO);
menuItemBack->setPosition(Point(size.width - menuItemBack->getContentSize().width - 100, menuItemBack->getContentSize().height + 10));
this->addChild(menu);

return true;
}
//点击返回按钮返回到主界面
void  Help::menuCallBack(Ref * object)
{
auto scene = MainMenu::createScene();
Director::getInstance()->replaceScene(scene);
}