Need help: box2D b2.ContactListener() not working in native iOS

Hi…,

I am testing box2D directly in Cocos Creator 1.6.1, as explaind here:
https://discuss.cocos2d-x.org/t/use-box2d-functions-in-cocos-creator/38433

var contactListener = new b2.ContactListener();

works in the browser, but not in native iOS.

Any help?

Thanks

Mike

P.S.: I solved this by switching to Creator 2.1.0. But now I have massive performance problems, see here:
https://discuss.cocos2d-x.org/t/2-1-0-hello-world-only-2-fps-on-ios/45771