Sample usage of AVAudioSessionInterruptionNotification v2

SampleAVAudioSessionInterruptionNotification-v2.swift

func addInterruptionNotification() {
    // add audio session interruption notification
    NSNotificationCenter.defaultCenter().addObserver(self,
        selector: "handleInterruption:",
        name: AVAudioSessionInterruptionNotification,
        object: nil)
}

func handleInterruption(notification: NSNotification) {
    if notification.name != AVAudioSessionInterruptionNotification
        || notification.userInfo == nil{
        return
    }
    var info = notification.userInfo!
    let value = (info[AVAudioSessionInterruptionTypeKey] as NSNumber).unsignedLongValue
    if let type = AVAudioSessionInterruptionType.fromRaw(value) {
        switch type {
        case .Began:
            // interruption began
            println("began")
        case .Ended:
            // interruption ended
            println("ended")
        }
    }
}