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Change AVAudio interruption and route change handlers to use guards #3

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Change AVAudio interruption and route change handlers to use guards #3

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48 changes: 27 additions & 21 deletions Chapter 2/AudioLooper/AudioLooper/PlayerController.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -112,32 +112,38 @@ class PlayerController: NSObject, AVAudioPlayerDelegate {
}

func handleInterruption(_ notification: Notification) {
if let info = (notification as NSNotification).userInfo {
let type = info[AVAudioSessionInterruptionTypeKey] as! AVAudioSessionInterruptionType
if type == .began {
stop()
delegate?.playbackStopped()
} else {
let options = info[AVAudioSessionInterruptionOptionKey] as! AVAudioSessionInterruptionOptions
if options == .shouldResume {
play()
delegate?.playbackBegan()
}
guard let info = notification.userInfo,
let typeValue = info[AVAudioSessionInterruptionTypeKey] as? UInt,
let type = AVAudioSessionInterruptionType(rawValue: typeValue) else {
return
}
if type == .began {
stop()
delegate?.playbackStopped()
}
else if type == .ended {
guard let optionsValue = info[AVAudioSessionInterruptionOptionKey] as? UInt else {
return
}
let options = AVAudioSessionInterruptionOptions(rawValue: optionsValue)
if options.contains(.shouldResume) {
play()
delegate?.playbackBegan()
}
}
}

func handleRouteChange(_ notification: Notification) {
if let info = (notification as NSNotification).userInfo {

let reason = info[AVAudioSessionRouteChangeReasonKey] as! AVAudioSessionRouteChangeReason
if reason == .oldDeviceUnavailable {
let previousRoute = info[AVAudioSessionRouteChangePreviousRouteKey] as! AVAudioSessionRouteDescription
let previousOutput = previousRoute.outputs.first!
if previousOutput.portType == AVAudioSessionPortHeadphones {
stop()
delegate?.playbackStopped()
}
guard let info = notification.userInfo,
let reason = info[AVAudioSessionRouteChangeReasonKey] as? AVAudioSessionRouteChangeReason else {
return
}
if reason == .oldDeviceUnavailable {
let previousRoute = info[AVAudioSessionRouteChangePreviousRouteKey] as! AVAudioSessionRouteDescription
let previousOutput = previousRoute.outputs.first!
if previousOutput.portType == AVAudioSessionPortHeadphones {
stop()
delegate?.playbackStopped()
}
}
}
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