cocos2dx中的输入类CCTextFieldTTF。还是相当好用的， 其中，很多人都会关注怎么判断用户输入的数字，字母，汉字？ 通过重载onTextFieldInsertText函数，我们可以自定义自己想要的效果。 以下代码，是参考官方的示例，添加了是否数字、字母、汉字的判断，还

cocos2dx中的输入类CCTextFieldTTF。还是相当好用的，

其中，很多人都会关注怎么判断用户输入的数字，字母，汉字？

通过重载onTextFieldInsertText函数，我们可以自定义自己想要的效果。

以下代码，是参考官方的示例，添加了是否数字、字母、汉字的判断，还增加了以空格和回车作为输入结束符。

以下代码，拷到新建项目的HelloWorld中可以直接用（本文版本cocos2dx 2.2.2）。

上代码： .h文件

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
USING_NS_CC;

class HelloWorld : public cocos2d::CCLayer,public CCTextFieldDelegate,public CCIMEDelegate
{
public:
 // Method 'init' in cocos2d-x returns bool, instead of 'id' in cocos2d-iphone (an object pointer)
 virtual bool init();

 // there's no 'id' in cpp, so we recommend to return the class instance pointer
 static cocos2d::CCScene* scene();
 
 // preprocessor macro for "static create()" constructor ( node() deprecated )
 CREATE_FUNC(HelloWorld);
 
 void callbackRemoveNodeWhenDidAction(CCNode * pNode);
 virtual void onClickTrackNode(bool bClicked,CCTextFieldTTF * pSender);
 
 // CCLayer
 virtual void onEnter();
 virtual void onExit();
 virtual void registerWithTouchDispatcher();
 virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
 virtual void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);
 
 // CCTextFieldDelegate
 virtual bool onTextFieldAttachWithIME(CCTextFieldTTF * pSender);
 virtual bool onTextFieldDetachWithIME(CCTextFieldTTF * pSender);
 virtual bool onTextFieldInsertText(CCTextFieldTTF * pSender, const char * text, int nLen);
 virtual bool onTextFieldDeleteBackward(CCTextFieldTTF * pSender, const char * delText, int nLen);
 virtual bool onDraw(CCTextFieldTTF * pSender);

 //CCIMEDelegate
 //keyboard show/hide notification
 //virtual void keyboardWillShow(CCIMEKeyboardNotificationInfo& info);
 //virtual void keyboardWillHide(CCIMEKeyboardNotificationInfo& info);
 
private:
 CCTextFieldTTF* m_pTextField;
	CCTextFieldTTF* m_pTextField2;
 CCAction* m_pTextFieldAction;
 bool m_bAction;
 int m_nCharLimit; // the textfield max char limit
 CCPoint m_beginPos;
 float adjustVert;
};

#endif // __HELLOWORLD_SCENE_H__

.cpp文件

#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"

using namespace cocos2d;
using namespace CocosDenshion;

#define FONT_NAME "Thonburi"
#define FONT_SIZE 36

CCScene* HelloWorld::scene()
{
 // 'scene' is an autorelease object
 CCScene *scene = CCScene::create();
 
 // 'layer' is an autorelease object
 HelloWorld *layer = HelloWorld::create();

 // add layer as a child to scene
 scene->addChild(layer);

 // return the scene
 return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
 //////////////////////////////
 // 1. super init first
 if ( !CCLayer::init() )
 {
 return false;
 }
 
 setTouchEnabled(true); //注意要设置当前layer为可触摸
 
 CCSize size = CCDirector::sharedDirector()->getWinSize();
 CCSprite* pSprite = CCSprite::create("HelloWorld.png");
 pSprite->setPosition( (size.width/2, size.height/2) );
 this->addChild(pSprite, 0);
 
 
 return true;
}

void HelloWorld::registerWithTouchDispatcher()
{
 CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, false);//true会吞噬
}

void HelloWorld::onEnter()
{
 CCLayer::onEnter(); //这个父类的调用很重要！
 
 m_nCharLimit = 12;
 m_pTextFieldAction = CCRepeatForever::create(
 CCSequence::create(
 CCFadeOut::create(0.25),
 CCFadeIn::create(0.25),
 NULL
 ));
 m_pTextFieldAction->retain(); //这里一定要retain一次，否则会出现内存问题。
 
 m_bAction = false;
 
 // add CCTextFieldTTF
 CCSize s = CCDirector::sharedDirector()->getWinSize();
 m_pTextField = CCTextFieldTTF::textFieldWithPlaceHolder("",
 FONT_NAME,
 FONT_SIZE);
 m_pTextField->setColor(ccWHITE); //设置输入编辑框中字符的颜色
// m_pTextField->setSecureTextEntry(true); //输入密码时，用点字符替代
 m_pTextField->setDelegate(this); //很重要 勿漏！！！
 m_pTextField->setPosition((s.width / 2, s.height / 2+30)); //将输入编辑框的y轴位置设低是为了测试，当出现键盘的时候，输入编辑框的自动向上调整。
 addChild(m_pTextField);

	 m_pTextField2 = CCTextFieldTTF::textFieldWithPlaceHolder("",
 FONT_NAME,
 FONT_SIZE);
 m_pTextField2->setColor(ccWHITE); //设置输入编辑框中字符的颜色
// m_pTextField2->setSecureTextEntry(true); //输入密码时，用点字符替代
 m_pTextField2->setDelegate(this); 
 m_pTextField2->setPosition((s.width / 2, s.height / 2-30)); //将输入编辑框的y轴位置设低是为了测试，当出现键盘的时候，输入编辑框的自动向上调整。
 addChild(m_pTextField2);


}

//返回节点的rect
static CCRect getRect(CCNode * pNode)
{
 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;
}

bool HelloWorld::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)
{
 CCLOG("++++++++++++++++++++++++++++++++++++++++++++");
 m_beginPos = pTouch->getLocation();
 return true;
}

void HelloWorld::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)
{
 if (! m_pTextField)
 {
 return;
 }
 
 CCPoint endPos = pTouch->getLocation();
 
 // 以下这部分代码是用于检测 begin touch 到 end touch之间的距离是否超过5.0，如果是，则返回；否则，继续执行下面的判断是否点击到编辑框的代码。
 float delta = 5.0f;
 if (::abs(endPos.x - m_beginPos.x) > delta
 || ::abs(endPos.y - m_beginPos.y) > delta)
 {
 // not click
 m_beginPos.x = m_beginPos.y = -1;
 return;
 }
 
 // decide the trackNode is clicked.
 CCRect rect;
 rect = getRect(m_pTextField);
 this->onClickTrackNode(rect.containsPoint(endPos),m_pTextField);

	CCRect rect2;
	rect2 = getRect(m_pTextField2);
 this->onClickTrackNode(rect2.containsPoint(endPos),m_pTextField2);

 CCLOG("----------------------------------");
}

void HelloWorld::onClickTrackNode(bool bClicked,CCTextFieldTTF * pSender)
{
 if (bClicked)
 {
 // TextFieldTTFTest be clicked
 CCLOG("attachWithIME");
 pSender->attachWithIME(); //调用键盘
 }
 else
 {
 // TextFieldTTFTest not be clicked
 CCLOG("detachWithIME");
 pSender->detachWithIME(); //隐藏键盘
 }
}


void HelloWorld::onExit()
{
 m_pTextFieldAction->release();
 CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);
}



// CCTextFieldDelegate protocol
bool HelloWorld::onTextFieldAttachWithIME(CCTextFieldTTF * pSender)
{
 if (! m_bAction)
 {
 pSender->runAction(m_pTextFieldAction);
 m_bAction = true;
 }
 return false;
}

bool HelloWorld::onTextFieldDetachWithIME(CCTextFieldTTF * pSender)
{
 if (m_bAction)
 {
 pSender->stopAction(m_pTextFieldAction);
 pSender->setOpacity(255);
 m_bAction = false;
 }
 return false;
}
//本文的重点在此
bool HelloWorld::onTextFieldInsertText(CCTextFieldTTF * pSender, const char * text, int nLen)
{
 	
	//if insert enter, treat as default to detach with ime
	CCLOG("%d",nLen);//当前输入的单个字符长度

	//空格和\n作为输入结束符
	if (*text==' '||'\n' == *text)
	{
	pSender->detachWithIME(); //关闭输入 隐藏键盘
	return true;
	}
	
	//中文的nlen是3 数字和字母的是1
	//如果输入是中文 则不接受输入的内容
	if (nLen>1)
	{
	
	return true;//true 则不接受输入的内容 但是可以继续输入
	}

	//判断是否数字或者字符,和下划线_
	//不接受数字和英文大小写字符以外的输入
	if((*text>='0'&& *text<='9')||((*text>='a'&&*text<='z')||((*text>='A')&&(*text<='Z')))||*text>='_')
	{
	}
	else
	{
	
	return true;
	}
	


	// if the textfield's char count more than m_nCharLimit, doesn't insert text anymore.
	if (pSender->getCharCount() >= m_nCharLimit)
	{
	return true;
	}
 
 //// 创建输入时动画 create a insert text sprite and do some action 
 //CCLabelTTF * label = CCLabelTTF::create(text, FONT_NAME, FONT_SIZE);
 //this->addChild(label);
 //ccColor3B color = { 226, 121, 7};
 //label->setColor(color);
 //
 //// move the sprite from top to position
 //CCPoint endPos = pSender->getPosition();
 //if (pSender->getCharCount())
 //{
 // endPos.x += pSender->getContentSize().width / 2;
 //}
 //CCSize inputTextSize = label->getContentSize();
 //CCPoint beginPos(endPos.x, CCDirector::sharedDirector()->getWinSize().height - inputTextSize.height * 2);
 //
 //float duration = 0.5;
 //label->setPosition(beginPos);
 //label->setScale(8);
 //
 //CCAction * seq = CCSequence::create(
 // CCSpawn::create(
 // CCMoveTo::create(duration, endPos),
 // CCScaleTo::create(duration, 1),
 // CCFadeOut::create(duration),
 // 0),
 // CCCallFuncN::create(this, callfuncN_selector(HelloWorld::callbackRemoveNodeWhenDidAction)),
 // 0);
 //label->runAction(seq);
 return false;
}

bool HelloWorld::onTextFieldDeleteBackward(CCTextFieldTTF * pSender, const char * delText, int nLen)
{
 ////创建删除字符动画 create a delete text sprite and do some action 
 //CCLabelTTF * label = CCLabelTTF::create(delText, FONT_NAME, FONT_SIZE);
 //this->addChild(label);
 //
 //// move the sprite to fly out
 //CCPoint beginPos = pSender->getPosition();
 //CCSize textfieldSize = pSender->getContentSize();
 //CCSize labelSize = label->getContentSize();
 //beginPos.x += (textfieldSize.width - labelSize.width) / 2.0f;
 //
 //CCSize winSize = CCDirector::sharedDirector()->getWinSize();
 //CCPoint endPos(- winSize.width / 4.0f, winSize.height * (0.5 + (float)rand() / (2.0f * RAND_MAX)));
 //
 //float duration = 1;
 //float rotateDuration = 0.2f;
 //int repeatTime = 5;
 //label->setPosition(beginPos);
 //
 //CCAction * seq = CCSequence::create(
 // CCSpawn::create(
 // CCMoveTo::create(duration, endPos),
 // CCRepeat::create(
 // CCRotateBy::create(rotateDuration, (rand()%2) ? 360 : -360),
 // repeatTime),
 // CCFadeOut::create(duration),
 // 0),
 // CCCallFuncN::create(this, callfuncN_selector(HelloWorld::callbackRemoveNodeWhenDidAction)),
 // 0);
 //label->runAction(seq);
 return false;
}

bool HelloWorld::onDraw(CCTextFieldTTF * pSender)
{
 return false;
}

void HelloWorld::callbackRemoveNodeWhenDidAction(CCNode * pNode)
{
 this->removeChild(pNode, true);
}
//虚拟键盘
//void HelloWorld::keyboardWillShow(CCIMEKeyboardNotificationInfo& info)
//{
// CCLOG("TextInputTest:keyboardWillShowAt(origin:%f,%f, size:%f,%f)",
// info.end.origin.x, info.end.origin.y, info.end.size.width, info.end.size.height);
// 
// if (! m_pTextField)
// {
// return;
// }
// 
// CCRect rectTracked = getRect(m_pTextField);
// 
// CCLOG("TextInputTest:trackingNodeAt(origin:%f,%f, size:%f,%f)",
// rectTracked.origin.x, rectTracked.origin.y, rectTracked.size.width, rectTracked.size.height);
// 
// // if the keyboard area doesn't intersect with the tracking node area, nothing need to do.
// if (! rectTracked.intersectsRect(info.end))
// {
// return;
// }
// 
// // assume keyboard at the bottom of screen, calculate the vertical adjustment.
// 
// //计算出需要y轴需要调整的距离
// adjustVert = info.end.getMaxY() - rectTracked.getMinY();
// CCLOG("TextInputTest:needAdjustVerticalPosition(%f)", adjustVert);
// 
// // move all the children node of KeyboardNotificationLayer
// CCArray * children = getChildren();
// CCNode * node = 0;
// int count = children->count();
// CCPoint pos;
// for (int i = 0; i < count; ++i)
// {
// node = (CCNode*)children->objectAtIndex(i);
// pos = node->getPosition();
// pos.y += adjustVert; //所有的节点都向上移动
// node->setPosition(pos);
// }
//}
//
//
//void HelloWorld::keyboardWillHide(CCIMEKeyboardNotificationInfo &info)
//{
// CCLOG("TextInputTest:keyboardWillShowAt(origin:%f,%f, size:%f,%f)",
// info.end.origin.x, info.end.origin.y, info.end.size.width, info.end.size.height);
// 
// CCArray * children = getChildren();
// CCNode * node = 0;
// int count = children->count();
// CCPoint pos;
// for (int i = 0; i < count; ++i)
// {
// node = (CCNode*)children->objectAtIndex(i);
// pos = node->getPosition();
// pos.y -= adjustVert; //所有的节点都向下移动，恢复原来的位置
// node->setPosition(pos);
// }
//}

（注意：onTextFieldInsertText函数中是const char * text，使用的时候需要星号* text）

输入框，把锚点设置在(0.0,0.5),则会左对齐，此外如果这个修改了，也需要修改触摸的范围。

我习惯另外做一个显示的背景框，用作点击范围，这样用户使用比较方便。

CCTextFieldTTF相当灵活，方便我们自定义。很好！大赞！

参考资料：

http://blog.csdn.net/crayondeng/article/details/12175367 Cocos2d-x CCEditBox & CCTextFieldTTF