cocos2dx之创建一个输入框

在游戏中，有时候修要用户输入用户名密码等，这时候需要用到虚拟键盘来实现，在Cocos2dx中，通过使用集成输入法代理类(CCIMEDelegate)和其字标签类(CCLabelTTF)的输入框类(CCTextFieldTTF)来实现。

例子代码如下：

class KeyboardNotificationLayer;

class MyTextInputLayer : public MyTextInputLayerBase
{
public:
    MyTextInputLayer();
    virtual ~MyTextInputLayer();

public:
    virtual void initLayer();

private:
    KeyboardNotificationLayer *m_keyBoardNotify;

};//end of MyTextInputLayer

/*
*@KeyboardNotificationLayer
*/
class KeyboardNotificationLayer : public MyTextInputLayerBase, public CCIMEDelegate
{
public:
    KeyboardNotificationLayer();
    ~KeyboardNotificationLayer();
    bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
    void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);
    void onEnter();
    void onExit();
public:
    void keyboardWillShow(CCIMEKeyboardNotificationInfo& info);
    void keyboardDidShow(CCIMEKeyboardNotificationInfo& info);
    void keyboardWillHide(CCIMEKeyboardNotificationInfo& info);
    void keyboardDidHide(CCIMEKeyboardNotificationInfo& info);
    void registerWithTouchDispatcher(void);
    void onClickTrackNode(bool bClicked);

public:
    void initLayer();

private:
     CCNode * m_pTrackNode;

};// end of MyTextInputLayer

具体实现(代码我写的很不规范，只是举个例子而已)：

void KeyboardNotificationLayer::onClickTrackNode(bool bClicked) {
    CCTextFieldTTF * pTextField = dynamic_cast<CCTextFieldTTF *>(m_pTrackNode);
    if(bClicked) {
        pTextField->attachWithIME();
    } else {
        pTextField->detachWithIME();
    }
}

bool KeyboardNotificationLayer::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent) {
    CCTextFieldTTF * pTextField = dynamic_cast<CCTextFieldTTF *>(m_pTrackNode);
    CCPoint screeView = pTouch->locationInView();
    CCPoint glView = CCDirector::sharedDirector()->convertToGL(screeView);
    if(pTextField != 0) {
        CCSize textSize = pTextField->getContentSize();
        pTextField->attachWithIME();
        CCPoint point = convertTouchToNodeSpaceAR(pTouch);
        CCRect rect = getRect(pTextField);
        this->onClickTrackNode(CCRect::CCRectContainsPoint(rect, point));// 判断点击的位置是不是在输入框的范围之类
    }
    return true;
}

static CCRect getRect(CCNode * pNode)
{ //得到输入框的范围
    CCRect rc;
    rc.origin = pNode->getPosition();
    rc.size = pNode->getContentSize();
    rc.origin.x -= rc.size.width / 2;
    rc.origin.y -= rc.size.height / 2;
    return rc;
}

创建成功了，你这时候，只要点击屏幕就可以开始输入了。