控件获取显示null

Studio
#1

用cocos 生成的Login工程，加了个loadingbar，但是在监听事件添加后，单击login按钮，中断，提示BAR为null,求大神解答。

代码如下

helloworld.cpp的

请把代码粘贴在这里
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
    
    auto rootNode = CSLoader::createNode("MainScene.csb");
     
    addChild(rootNode);
     
    Button* login = dynamic_cast  (seekNodeByName(rootNode, std::string("Button_1_2_6_10")));
     
    LoadingBar* Bar = (LoadingBar*)seekNodeByName(rootNode, std::string("Bar"));
    Bar->setPosition(Vec2(390, 390));
    Bar->setPercent(Bar->getPercent() + 80);
     
    login->setPosition(Vec2(200, 200));
    login->addTouchEventListener(CC_CALLBACK_2(HelloWorld::onClicks, this));
    logout = (Button*)seekNodeByName(rootNode, std::string("Button_1_0_4_8_12"));
     
    logout->setPosition(Vec2(400, 400));
    logout->setTag(10);

    return true;
}
Node * HelloWorld::seekNodeByName(Node * root, std::string & name)
{
    if (!root)
        return nullptr;
    if (root->getName() == name)
        return root;

    const auto& arrayNode = root->getChildren();
    for (auto& child : arrayNode)
    {
        Node* pNode = dynamic_cast(child);
        if (pNode)
        {
            Node* res = seekNodeByName(pNode, name);
            if (res)
                return res;
        }
    }



    return nullptr;
}

 void HelloWorld::onClicks(Ref * sender, cocos2d::ui::Widget::TouchEventType type)
{    switch (type) {
    case Widget::TouchEventType::BEGAN:

        break;
    case Widget::TouchEventType::ENDED:
        //Button* logout = (Button*)logout->getChildByTag(12);
        if (logout->isVisible()) {
            logout->setVisible(false); 
        }
        else {
            logout->setVisible(true);
        }
       Bar->setPercent(Bar->getPercent() - 10);
                break;

    }
         

}


```


helloworld.h的

public:
    // there's no 'id' in cpp, so we recommend returning the class instance pointer
    static cocos2d::Scene* createScene();

    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();

    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
    Node * HelloWorld::seekNodeByName(Node * root, std::string & name);
    cocos2d::ui::Button* login;
    cocos2d::ui::Button* logout;
    cocos2d::ui::LoadingBar* Bar;
    void HelloWorld::onClicks(Ref* sender,cocos2d::ui::Widget::TouchEventType type);



```
#2

显示有问题，重新贴下
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !Layer::init() )
{
return false;
}

auto rootNode = CSLoader::createNode("MainScene.csb");
 
addChild(rootNode);
//Button* login =  login->getChildByName();
Button* login = dynamic_cast <Button*> (seekNodeByName(rootNode, std::string("Button_1_2_6_10")));
//auto UIt = cocostudio::GUIReader::getInstance()->widgetFromJsonFile(".cocos-project");
LoadingBar* Bar = (LoadingBar*)seekNodeByName(rootNode, std::string("Bar"));
Bar->setPosition(Vec2(390, 390));
Bar->setPercent(Bar->getPercent() + 80);
//Bar->addTouchEventListener(CC_CALLBACK_2(HelloWorld::onClicks, this));
login->setPosition(Vec2(200, 200));
login->addTouchEventListener(CC_CALLBACK_2(HelloWorld::onClicks, this));
logout = (Button*)seekNodeByName(rootNode, std::string("Button_1_0_4_8_12"));
//auto button = static_cast<ui::Button*>(rootNode->getChildByName("Button_1_0_4_8_12"));
logout->setPosition(Vec2(400, 400));
logout->setTag(10);

return true;

}

Node * HelloWorld::seekNodeByName(Node * root, std::string & name)
{
if (!root)
return nullptr;
if (root->getName() == name)
return root;

const auto& arrayNode = root->getChildren();
for (auto& child : arrayNode)
{
    Node* pNode = dynamic_cast<Node*>(child);
    if (pNode)
    {
        Node* res = seekNodeByName(pNode, name);
        if (res)
            return res;
    }
}



return nullptr;

}

void HelloWorld::onClicks(Ref * sender, cocos2d::ui::Widget::TouchEventType type)
{ switch (type) {
case Widget::TouchEventType::BEGAN:

    break;
case Widget::TouchEventType::ENDED:
    //Button* logout = (Button*)logout->getChildByTag(12);
    if (logout->isVisible()) {
        logout->setVisible(false); 
    }
    else {
        logout->setVisible(true);
    }
   Bar->setPercent(Bar->getPercent() - 10);
            break;
case Widget::TouchEventType::MOVED:
    //Bar->setPercent(Bar->getPercent() + 10);
    break;
}

}

public:
// there’s no ‘id’ in cpp, so we recommend returning the class instance pointer
static cocos2d::Scene* createScene();

// Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
virtual bool init();

// implement the "static create()" method manually
CREATE_FUNC(HelloWorld);
Node * HelloWorld::seekNodeByName(Node * root, std::string & name);
cocos2d::ui::Button* login;
cocos2d::ui::Button* logout;
cocos2d::ui::LoadingBar* Bar;
void HelloWorld::onClicks(Ref* sender,cocos2d::ui::Widget::TouchEventType type);
#3

补充：
bool HelloWorld::init() 运行都OK的，所有控件都变换了位置，但是在单击login后，bar显示为NULL。
注塑掉BAR的话，能正常运行，即在单击login后，logout能显示和隐藏

#4

参考下test工程吧还有看看源码，你函数写的不规范。
主要检查：侦听函数

#5

已解决 ，去掉前面的类型名即可。但是，求大神帮忙解释是啥原因引起的这个问题。