ios - Call a method from another UIViewController in swift 2.0 -

i have app plays song, have external class has playsound func , variables needed:

class song: nsobject {      var audioplayer: avaudioplayer!     var devicecurrenttime: nstimeinterval!      func playsong() {          let sound = nsbundle.mainbundle().pathforresource("song", oftype: "mp3")         let sounddata = nsdata(contentsoffile: sound!)         //  self.audioplayer = avaudioplayer(data: sounddata!) throws          self.audioplayer = nil         {             self.audioplayer = try avaudioplayer(data: sounddata!)         }         catch {             print("handle \(error) here")         }          let delay:nstimeinterval = 0.0//100ms         var playtime:nstimeinterval         playtime = audioplayer.devicecurrenttime + delay          self.audioplayer?.playattime(playtime)         self.audioplayer?.play()       } 

and in viewdidload of mainviewcontroller play song acces method song object:

    super.viewdidload()      let vc: nsobject = song()     if let myvc = vc as? song {         myvc.playsong()     } 

but doesnt play song...if put variables song mainviewcontroler playsong method , playsong() in viewdidload, works, have in external class.

any please? :)

you can create global method. create empty swift file , add code in it:

import foundation import avfoundation   var backgroundmusicplayer = avaudioplayer()  func playbackgroundmusic(filename: string) {     let url = nsbundle.mainbundle().urlforresource(filename, withextension: nil)     guard let newurl = url else {         print("could not find file: \(filename)")         return     }     {         backgroundmusicplayer = try avaudioplayer(contentsofurl: newurl)         backgroundmusicplayer.numberofloops = -1         backgroundmusicplayer.preparetoplay()         backgroundmusicplayer.play()     } catch let error nserror {         print(error.description)     } } 

now when ever want play song call method way:

playbackgroundmusic("yoursong.mp3") 

and if want go class can way:

import foundation import avfoundation  var audioplayer: avaudioplayer! var devicecurrenttime: nstimeinterval!  class song: nsobject {      func playsong() {          let sound = nsbundle.mainbundle().pathforresource("we_are_one_ole_ola_", oftype: "mp3")         let sounddata = nsdata(contentsoffile: sound!)         //  self.audioplayer = avaudioplayer(data: sounddata!) throws          audioplayer = nil         {             audioplayer = try avaudioplayer(data: sounddata!)         }         catch {             print("handle \(error) here")         }          let delay:nstimeinterval = 0.0//100ms         var playtime:nstimeinterval         playtime = audioplayer.devicecurrenttime + delay          audioplayer?.playattime(playtime)         audioplayer?.play()      } } 

in other class can use way:

override func viewdidload() {     super.viewdidload()      let temp = song()     temp.playsong() }