swift - Stop async operations on window close -


in app delegate have put callback stop program when window shut. 

 func applicationshouldterminateafterlastwindowclosed(sender: nsapplication) -> bool {         return true     }

this doesn't work because (i assume) there async bluetooth task running. best way stop running , clean up?

i use approach

[nsapp performselector:@selector(terminate:) withobject:nil afterdelay:0];

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