1、 创建一个精灵sprite；
2、一个触摸事件 listener ，设置listener的onTouchBegan,onTouchMoved,onTouchEnded;
3、将sprite 和 listener关联起来。
代码语言：javascript复制 Sprite* sprite1 = Sprite::create("pk.png");
this->addChild(sprite1, 0);
sprite1->setPosition(ccp(300, 400));
sprite1->setTag(1);
Sprite* sprite2 = Sprite::create("pk.png");
this->addChild(sprite2, 0);
sprite2->setPosition(ccp(200, 400));
sprite2->setTag(0);
Sprite* sprite3 = Sprite::create("pk.png");
this->addChild(sprite3, 0);
sprite3->setPosition(ccp(400, 400));
sprite3->setTag(0);
auto listener1 = EventListenerTouchOneByOne::create();//创建一个触摸监听
listener1->setSwallowTouches(true); //设置是否想下传递触摸
//通过 lambda 表达式 直接实现触摸事件的回掉方法
listener1->onTouchBegan = [](Touch* touch, Event* event){
auto target = static_cast<Sprite*>(event->getCurrentTarget());
Point locationInNode = target->convertToNodeSpace(touch->getLocation());
Size s = target->getContentSize();
Rect rect = Rect(0, 0, s.width, s.height);
if (rect.containsPoint(locationInNode))
{
log("sprite began... x = %f, y = %f", locationInNode.x, locationInNode.y);
target->setOpacity(180);
return true;
}
return false;
};
listener1->onTouchMoved = [](Touch* touch, Event* event){
auto target = static_cast<Sprite*>(event->getCurrentTarget());
target->setPosition(target->getPosition() touch->getDelta());
};
listener1->onTouchEnded = [=](Touch* touch, Event* event){
auto target = static_cast<Sprite*>(event->getCurrentTarget());
log("sprite onTouchesEnded.. ");
target->setOpacity(255);
};
_eventDispatcher->addEventListenerWithSceneGraphPriority(listener1, sprite1);
_eventDispatcher->addEventListenerWithSceneGraphPriority(listener1->clone(), sprite2);
_eventDispatcher->addEventListenerWithSceneGraphPriority(listener1->clone(), sprite3);如果想实现多个精灵拖动，使用clone方法
