Cocos2dx杂记：仿Android提示Toast

在游戏制作的过程中经常会使用到提示，常见的方法是通过jni调用android下的方法实现toast提示
通过cocos2dx的LayerColor可以实现如上功能

1、头文件Toast.h

#pragma once
#include "cocos2d.h"

USING_NS_CC;

class Toast : public Layer {
public:
    Toast();
    ~Toast();
    virtual bool init();
    CREATE_FUNC(Toast);
    static Toast* create(const char* text, int fontsize = 30, float time = 1);
private:
    //设置文字
    void setText(const char* text, int fontsize, float time);
    //设置背景
    void setBackgound();
    //删除
    void removeSelf();
private:
    LayerColor *m_backgound;
    Label *m_label;
};

2、实现Toast.cpp

#include "Toast.h"
Toast::Toast(void)
{
}

Toast::~Toast(void)
{
}

bool Toast::init()
{
    if (!Layer::init()) {
        return false;
    }
    //设置大小与显示位置
    this->setContentSize(Size::ZERO);
    auto size = Director::getInstance()->getVisibleSize();
    Vec2 pos = Vec2(size.width / 2, 70);
    this->setPosition(pos);

    return true;
}

//创建弹出提示框
Toast* Toast::create(const char* text, int fontsize, float time)
{
    Toast* toast = Toast::create();
    toast->setLocalZOrder(INT_MAX);
    toast->setText(text, fontsize, time);
    toast->setBackgound();
    return toast;
}

//设置文字
void Toast::setText(const char* text, int fontsize, float time)
{
    m_label = Label::createWithSystemFont(text, "", fontsize);
    this->addChild(m_label, 3);

    Sequence * ation = Sequence::create(ScaleTo::create(time, 1.0), CallFunc::create(CC_CALLBACK_0(Toast::removeSelf, this)), NULL);
    this->runAction(ation);
}

//设置背景
void Toast::setBackgound(){
    m_backgound = LayerColor::create(Color4B(0, 0, 0, 0));
    this->addChild(m_backgound, 2);
    m_backgound->ignoreAnchorPointForPosition(false);
    m_backgound->setContentSize(Size::ZERO);
    m_backgound->setAnchorPoint(Vec2(0.5f, 0.5f));
    m_backgound->setOpacity(150);
    if (m_label){
        Size size = Size(m_label->getContentSize().width + m_label->getSystemFontSize(), m_label->getContentSize().height + m_label->getSystemFontSize() / 2);
        m_backgound->setContentSize(size);
        m_backgound->setPosition(m_label->getPosition());
    }
}

//移除Toast
void Toast::removeSelf(){
    this->removeFromParentAndCleanup(true);
}

3、使用方式

    auto toast = Toast::create("你好");
    this->addChild(toast)