cocos2d 2.0中 setTouchPriority无效的问题

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CCTouchDispatcher中是这样分发触摸事件的：

[cpp]view plaincopy 
    
 CCARRAY_FOREACH(m_pTargetedHandlers,pObj)//这里是遍历了一个注册过触摸事件的数组，按优先级排序
 {
 pHandler=(CCTargetedTouchHandler*)(pObj);
 
 if(!pHandler)
break;
 }
 
 boolbClaimed=false;
if(uIndex==CCTOUCHBEGAN)
 bClaimed=pHandler->getDelegate()->ccTouchBegan(pTouch,pEvent);
if(bClaimed)
 pHandler->getClaimedTouches()->addObject(pTouch);
 }else
 if(pHandler->getClaimedTouches()->containsObject(pTouch))
 {
 //movedendedcanceled
 bClaimed=true;
switch(sHelper.m_type)
caseCCTOUCHMOVED:
 pHandler->getDelegate()->ccTouchMoved(pTouch,pEvent);
caseCCTOUCHENDED:
 pHandler->getDelegate()->ccTouchEnded(pTouch,248);line-height:18px;list-style-position:outside !important;"> pHandler->getClaimedTouches()->removeObject(pTouch);
caseCCTOUCHCANCELLED:
 pHandler->getDelegate()->ccTouchCancelled(pTouch,108);color:inherit;line-height:18px;list-style-position:outside !important;"> }
if(bClaimed&&pHandler->isSwallowsTouches())
if(bNeedsMutableSet)
 pMutableTouches->removeObject(pTouch);
break;
 }

然后如果调用这里的 setPriority，就会重新排序数组： rearrangeHandlers

voidCCTouchDispatcher::setPriority(intnPriority,CCTouchDelegate*pDelegate) CCAssert(pDelegate!=NULL,"");
 CCTouchHandler*handler=NULL;
 handler=this->findHandler(pDelegate);
 CCAssert(handler!=NULL,153);background-color:inherit;font-weight:bold;">if(handler->getPriority()!=nPriority)
 handler->setPriority(nPriority);
this->rearrangeHandlers(m_pTargetedHandlers);
this->rearrangeHandlers(m_pStandardHandlers);
 }

但是在业务层调用的 setPriority是这样的：

voidCCTouchHandler::setPriority(intnPriority) m_nPriority=nPriority;
 }

所以你会发现如果在初始化一个控件的时候调用 setPriority就会有效，而在运行中动态更改就无效，就是因为初始化后的下一帧调用（调用onEnter时,会注册touchdelegate）会根据当前priority将其注册进那个数组：

voidCCTouchDispatcher::forceAddHandler(CCTouchHandler*pHandler,CCArray*pArray) unsignedintu=0;
 CCObject*pObj=NULL;
 CCARRAY_FOREACH(pArray,pObj)
 CCTouchHandler*h=(CCTouchHandler*)pObj;
if(h)
if(h->getPriority()<pHandler->getPriority())
 ++u;
if(h->getDelegate()==pHandler->getDelegate())
 CCAssert(0,"");
return;
 pArray->insertObject(pHandler,u);
 }

所以，改变触摸分发数组的机会只有一次，之后如果想动态的改变优先级需要获取TouchDispatcher后设置，或者类似menu可以调用现成的函数setHandlerPriority

解决：

//设置层级
            CCTouchDispatcher* pDispatcher = CCDirector::sharedDirector()->getTouchDispatcher();
            pDispatcher->removeDelegate(m_pCtiyGateBtn);
            pDispatcher->addTargetedDelegate(m_pCtiyGateBtn,1000,true);

cocos2d 2.0中 setTouchPriority无效的问题

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