Cocos2d-x v3 iOS app not registering first x touch events - ios

Question

I have a really weird issue with cocos2d-x v3, the first 15 touches or so are not registered on my iOS device (tried iPad 2 and iPad air). As soon as a touch is finally registered, everything works fine (aka all touches after that trigger the onTouch functions).
The touch events work perfectly fine in the simulator.
Also, the same code works perfectly fin in my Windows and Android builds.
Has anyone had this happen, or maybe know what could be causing it?
I'm using the listener, and I debugged up to the spot where touchesBegan forwards the input events to the listener, but even there the events don't come in until after the 15th tap or so.
It's really weird... And I figured I'd give it a shot here, as someone might have encountered this as well, before I start stripping code to as clean as possible, and then try to work my way back from there...
Kind regards,
Michaël
EDIT: As requested, here is some code. The desired behaviour is that it works in iOS devices like it should: First touch triggers the onTouchBegan.
I didn't add it as it didn't think it would matter, since the code works fine for Android.
But I appreciate that you'd like to see it, just in case I might have missed something
GameLayer is a Cocos2d::Layer.
void GameLayer::onEnter()
{
cocos2d::CCLayer::onEnter();
// Register Touch Event
auto pEventDispatcher = cocos2d::Director::getInstance()->getEventDispatcher();
if (pEventDispatcher)
{
// Touch listener
auto pTouchListener = cocos2d::EventListenerTouchOneByOne::create();
if (pTouchListener)
{
pTouchListener->setSwallowTouches( true );
pTouchListener->onTouchBegan = CC_CALLBACK_2( GameLayer::onTouchBegan, this );
pTouchListener->onTouchMoved = CC_CALLBACK_2( GameLayer::onTouchMoved, this );
pTouchListener->onTouchEnded = CC_CALLBACK_2( GameLayer::onTouchEnded, this );
pTouchListener->onTouchCancelled = CC_CALLBACK_2( GameLayer::onTouchCancelled, this );
pEventDispatcher->addEventListenerWithSceneGraphPriority( pTouchListener, this );
}
}
}
bool GameLayer::onTouchBegan( cocos2d::Touch* pTouch, cocos2d::Event* /*pEvent*/ )
{
// Breakpoint here triggers fine on first touch for Android/Windows/iOS Simulator,
// but not on iOS device (iPad/iPhone)
bool breakHere = true;
<<snip actual code>>
}
EDIT:
The problem was an std::ofstream trying to open() on the iOS device (most likely in a folder it didn't have access to).

Answer 1

I have lots of layers in my game and I don't do it like you do. In your code the need to get the EventDispatcher locally and create the touch listener like how you are seems odd to me. I've never seen it down that way in so many steps.
I do:
auto listener = cocos2d::EventListenerTouchOneByOne::create();
listener->setSwallowTouches(true);
listener->onTouchBegan = [&](cocos2d::Touch* touch, cocos2d::Event* event)
{
return true;
};
listener->onTouchEnded = [=](cocos2d::Touch* touch, cocos2d::Event* event)
{
// ... do something
};
cocos2d::Director::getInstance()->getEventDispatcher()->addEventListenerWithFixedPriority(listener, 31);

Answer 2

I got it fixed.
The problem was seemingly totally unrelated, I was trying to open an std::ofstream file (my log file), most likely in a folder it didn't have (any and/or write) access to.
Which is not required, nor wanted on the iOS device.
Once I added IOS to the exclusion list (just like Android and some more targets) everything started to work perfect.
I do not know what goes wrong exactly, and why it does start working after a few touch inputs, but I'm guess it was waiting or retrying something in the background.
I found the issue while debugging another one :)
Hopefully this helps anyone else who might stumble onto the same or a related issue.
Kind regards,
Michaël