swift – 调用中的额外参数userinfo

func onSetAudioWithTrackIndex(CurrentTrackIndex:Int,urlAudio: String){

    ........
    //try to pass currentTrackIndex data to timerfire
    playTimeClock = NSTimer.scheduledTimerWithTimeInterval(0.4,target: self,selector: "onSetPlayProgressTime:",userInfo: CurrentTrackIndex,repeats: true)

}

//Timerfire
func onSetPlayProgressTime(timer: NSTimer){

    var currentTime = mediaPlayer.currentPlaybackTime
    var playDuration = mediaPlayer.duration

    var trackIndexDict = ["trackIndex" : timer.userInfo]

    ................

    if currentTime == playDuration{                   
            NSNotificationCenter.defaultCenter().postNotificationName(MPMoviePlayerPlaybackDidFinishNotification,object: self,userInfo: trackIndexDict)
    }


    return
}