Slowly raise volume when alarm starts becomes active.

AlarmControlViewController.swift

override func viewDidLoad() {
      super.viewDidLoad()
        
      // Timer used to raise volume
      volumeTimer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: #selector(AlarmControlViewController.raiseVolume), userInfo: nil, repeats: true)
}

func raiseVolume() {
        
      // Next volume level | 0.0 -> 1.0
      let newVolume = (player?.volume)! + 0.1
      let maxVolume = SPTVolume.abs(1.0)
        
      // If alarm is is playing and it's volume is not max
      if (player?.isPlaying == true && player?.volume != maxVolume) {
            
          // Increment sound level
          player?.setVolume(SPTVolume.abs(newVolume), callback: nil)
            
      } else if (player?.volume == maxVolume) {
            
          // Invalidate timer once max volume level is reached
          volumeTimer?.invalidate()
            
      }
 }