cocos2d-x 3.9 多点触控之iOS监听无效(只能监听到单点触控)

本文链接：https://blog.youkuaiyun.com/zhongjuelong/article/details/50269985

本文详细阐述了在iOS应用开发中遇到触摸事件监听失效的问题，通过修改AppController中的配置，成功解决了触摸事件无法正常响应的问题。文章提供了代码示例和检查方法，帮助开发者快速定位并解决类似问题。

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实现方法，直接上代码了：

    virtual void onTouchesBegan(const std::vector<Touch*>& touches, Event *unused_event) override;
    virtual void onTouchesMoved(const std::vector<Touch*>& touches, Event *unused_event) override;
    virtual void onTouchesEnded(const std::vector<Touch*>& touches, Event *unused_event) override;
    virtual void onTouchesCancelled(const std::vector<Touch*>&touches, Event *unused_event) override;

继承Layer的MyNode init中的代码：

    this->setTouchMode(Touch::DispatchMode::ALL_AT_ONCE);
    
    EventDispatcher* eventDispatcher = Director::getInstance()->getEventDispatcher();

    auto listener = EventListenerTouchAllAtOnce::create();
    listener->onTouchesBegan = CC_CALLBACK_2(RockerNode::onTouchesBegan, this);
    listener->onTouchesMoved = CC_CALLBACK_2(RockerNode::onTouchesMoved, this);
    listener->onTouchesEnded = CC_CALLBACK_2(RockerNode::onTouchesEnded, this);
    listener->onTouchesCancelled = CC_CALLBACK_2(RockerNode::onTouchesCancelled, this);
    eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

void MyNode::onTouchesBegan(const std::vector<Touch*>& touches, Event *unused_event)
{
    CCLOG("onTouchesBegan");
    for (auto &item: touches)      
    {
        auto touch = item;
        auto location = touch->getLocation();
        CCLOG("==%d,(%f,%f)",(int)this->getRockerID(),location.x,location.y);
        }

    }
}

void MyNode::onTouchesMoved(const std::vector<Touch*>& touches, Event *unused_event)
{
    CCLOG("onTouchesMoved");
}

void MyNode::onTouchesEnded(const std::vector<Touch*>& touches, Event *unused_event)
{
    CCLOG("onTouchesEnded");
}

void MyNode::onTouchesCancelled(const std::vector<Touch*>&touches, Event *unused_event)
{
    CCLOG("onTouchesCancelled");
}

用如下方法检测监听是否有效：

CCLOG("====%d",listener->checkAvailable());

打印的结果是“====0”,恭喜你，有救了，打开AppController.mm,查找到：

[eaglView setMultipleTouchEnabled:NO];

这下明白了吧？！将NO改成YES就可以了