ios - Swift: How to pass in a closure as a function argument -

ios - Swift: How to pass in a closure as a function argument -

i'm trying figure out syntax passing in closure (completion handler) argument function.

my 2 functions are:

response handler: func responsehandler(response: nsurlresponse!, data: nsdata!, error: nserror!) -> void { var err: nserror var jsonresult: nsdictionary = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.mutablecontainers, error: nil) nsdictionary println("assynchronous\(jsonresult)") } query function public func queryallflightswithclosure( ) { querytype = .allflightsquery allow urlpath = "/api/v1/flightplan/" allow urlstring : string = "http://\(self.host):\(self.port)\(urlpath)" var url : nsurl = nsurl(string: urlstring)! var request : nsurlrequest = nsurlrequest(url: url) nsurlconnection.sendasynchronousrequest(request, queue: nsoperationqueue(), completionhandler:responsehandler) }

i'd modify query like:

public fund queryallflightswithclosure( <closure>) {

so can externally pass closure function. know there back upwards training closures i"m not sure if thats way go either. can't seem syntax correct...

i've tried:

public func queryallflightswithclosure(completionhandler : {(response: nsurlresponse!, data: nsdata!, error: nserror!) -> void} ) {

but keeps giving me error

it might help defining type alias closure:

public typealias myclosure = (response: nsurlresponse!, data: nsdata!, error: nserror!) -> void

that makes function signature "lighter" , more readable:

public func queryallflightswithclosure(completionhandler : myclosure ) { }

however, replace myclosure aliasing, , have right syntax:

public func queryallflightswithclosure(completionhandler : (response: nsurlresponse!, data: nsdata!, error: nserror!) -> void ) { }

ios xcode swift