onbegincontact not work

[scofieldly]

Hi all,

 

I want to use p2 onbegincontact to detect 2 p2 body overlap and want to do some actions, 

I tried to write like this

body1.onBeginContact.add(func, this);

 

but it seems when it overlap another body, the callback func did not run. 

is there any tips for using this event, thanks.