ios - How to change value of variable inside of Void function? -

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i have function

public func lastactivityfor(username: string) -> string {     var lastseeninfo = "date"      onelastactivity.sendlastactivityquerytojid((username), sender: onechat.sharedinstance.xmpplastactivity) { (response, forjid, error) -> void in         if let timeinseconds = response?.lastactivityseconds() {             let time: nsnumber = nsnumber(unsignedlong: timeinseconds)              switch timeinseconds {             case 0:                 lastseeninfo = "online"             case _ timeinseconds > 0 && timeinseconds < 60:                 lastseeninfo = "last seen \(timeinseconds) seconds ago"             case _ timeinseconds > 59 && timeinseconds < 3600:                 lastseeninfo = "last seen \(timeinseconds / 60) minutes ago"             case _ timeinseconds > 3599 && timeinseconds < 86400:                 lastseeninfo = "last seen \(timeinseconds / 3600) hours ago"             case _ timeinseconds > 86399:                 let date = nsdate(timeintervalsincenow:-time.doublevalue)                 let dateformatter = nsdateformatter()                  dateformatter.dateformat = "dd.mm.yyyy"                 lastseeninfo = "last seen on \(dateformatter.stringfromdate(date))"             default:                 lastseeninfo = "never been online"             }         }     }     return lastseeninfo }

but when it's done, lastseeninfo variable doesn't change , still equal "date".

when call other file:

print(onelastactivity.sharedinstance.lastactivityfor("username_here"))

it prints

date last seen time ago

so works asynchronously how see. how can fix it? want fix without dispatch_async. how can modify function without touching nested function , -> void part?

i think problem request/response async in nature. old value being returned before result has finished.

two solutions: either make variable class instance , mutate it. making void return. or wait block finish risky , ill-advised design point of view

why not have class instance , use didset method? in class (view controller?)

public func lastactivityfor(username: string) {  onelastactivity.sendlastactivityquerytojid((username), sender: onechat.sharedinstance.xmpplastactivity) { (response, forjid, error) -> void in     if let timeinseconds = response?.lastactivityseconds() {         let time: nsnumber = nsnumber(unsignedlong: timeinseconds)          switch timeinseconds {         case 0:             self.lastseeninfo = "online"         case _ timeinseconds > 0 && timeinseconds < 60:             self.lastseeninfo = "last seen \(timeinseconds) seconds ago"         case _ timeinseconds > 59 && timeinseconds < 3600:             self.lastseeninfo = "last seen \(timeinseconds / 60) minutes ago"         case _ timeinseconds > 3599 && timeinseconds < 86400:             self.lastseeninfo = "last seen \(timeinseconds / 3600) hours ago"         case _ timeinseconds > 86399:             let date = nsdate(timeintervalsincenow:-time.doublevalue)             let dateformatter = nsdateformatter()              dateformatter.dateformat = "dd.mm.yyyy"             self.lastseeninfo = "last seen on \(dateformatter.stringfromdate(date))"         default:             self.lastseeninfo = "never been online"         }     } } }   var lastseeninfo:nsdate? {     didset {         //update display or     } }

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