ios - Completion handler is not called -


pardon me beginner's question, have function completion handler, it's not called when function complete. tip? thanks

    func updatedailylength(completion: ()-> void ) {           //do here     }

and in caller: 

updatedailylength(completion: { getmonthlydistance() })

the function getmonthlydistance() never called.

you need call updatedailylength

func updatedailylength(completion: ()-> void ) {       completion() }

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