回调函数里判断是弹起事件时会调用UIButton的removeFromParent方法，这时会导致游戏崩溃，代码中断在void Widget::onTouchEnded(Touch *touch,Event *unusedEvent)方法里的releaseUpEvent()调用处。

响应UIButton的触摸弹起事件时，删除UIButton控件崩溃

修改代码解决方法1

解决办法 
void Widget::releaseUpEvent()
{
    if (_touchEventListener && _touchEventSelector)
    {
        (_touchEventListener->*_touchEventSelector)(this,TOUCH_EVENT_ENDED);
    }
    
    if (_touchEventCallback) {
        _touchEventCallback(this,TouchEventType::ENDED);
    }
}
换个位置就好了
调用callback完以后释放本对象，但代码没执行完 继续调用Listener，这时释放的地址很可能不为空，就导致出错了。 

释放的时候改用

改用 widget->runAction(RemoveSelf::create());

代替原来的removeFromParent()

原理:我们可以看看引擎对removeSelf的实现

//
// Remove Self
//
RemoveSelf * RemoveSelf::create(bool isNeedCleanUp /*= true*/) 
{
	RemoveSelf *ret = new RemoveSelf();

	if (ret && ret->init(isNeedCleanUp)) {
		ret->autorelease();
	}

	return ret;
}

bool RemoveSelf::init(bool isNeedCleanUp) {
	_isNeedCleanUp = isNeedCleanUp;
	return true;
}

void RemoveSelf::update(float time) {
	CC_UNUSED_PARAM(time);
	_target->removeFromParentAndCleanup(_isNeedCleanUp);
}

RemoveSelf *RemoveSelf::reverse() const
{
	return RemoveSelf::create(_isNeedCleanUp);
}

RemoveSelf * RemoveSelf::clone() const
{
	// no copy constructor
	auto a = new RemoveSelf();
	a->init(_isNeedCleanUp);
	a->autorelease();
	return a;
}