how to stop audio when iOS Sleep Timer gets called - iphone

Question

I want to stop my audio app when iOS sleep timer gets called.
Just like Pandora app.
http://help.pandora.com/customer/portal/articles/24324-ios-sleep-timer-with-pandora
Tap the Clock app, Tap Timer, Select a time, Tap When Timer Ends, Tap Stop
Playing
This will sleep your Pandora app if it is running.
I can see inInterruptionState == kAudioSessionBeginInterruption gets called when iOS sleep timer ends, but how can I detect if it's sleep timer or just interruptions like phone call?
Here is my codes.
Currently, my app just starts playing again after iOS sleep timer ends.
// Audio Interruption Listener
void MyInterruptionListener(void *inClientData, UInt32 inInterruptionState) {
if (inInterruptionState == kAudioSessionBeginInterruption) {
[[DOSpeechManager sharedInstance] audioSessionBeginInterruption];
}
if (inInterruptionState == kAudioSessionEndInterruption) {
[[DOSpeechManager sharedInstance] audioSessionEndInterruption];
}
}
- (void)audioSessionBeginInterruption {
if ([_MyAcaTTS isSpeaking] && [_MyAcaTTS isPaused] == NO) {
[_MyAcaTTS pauseSpeakingAtBoundary:AcapelaSpeechImmediateBoundary];
[self setAudioSettionStatus:NO];
_audioInterruptedWhileSpeaking = YES;
}
}
- (void)audioSessionEndInterruption {
if (_audioInterruptedWhileSpeaking) {
[self setAudioSettionStatus:YES];
[_MyAcaTTS continueSpeaking];
}
}
- (void)setAudioSettionStatus:(BOOL)status {
AudioSessionSetActive(status);
[_MyAcaTTS setActive:status];
//cancel audio interrupted flag
if (status) {
_audioInterruptedWhileSpeaking = NO;
}
}

Answer 1

The trick is not to detect the source of the interruption, but to know whether your app should resume after the interruption.
The AVAudioSession API will send a notification when the audio session is interrupted. Within this notification, the OS gives a "hint" as to whether the app should resume playback or not.
See below:
//Add notification observer
__weak typeof(self) weakSelf = self;
self.audioSessionInterruptionNotification =
[[NSNotificationCenter defaultCenter] addObserverForName:AVAudioSessionInterruptionNotification
object:nil
queue:[NSOperationQueue mainQueue]
usingBlock:^(NSNotification *note) {
NSNumber* interruptionType = note.userInfo[AVAudioSessionInterruptionTypeKey];
NSNumber* interruptionOption = note.userInfo[AVAudioSessionInterruptionOptionKey];
BOOL shouldResume = interruptionOption.integerValue == AVAudioSessionInterruptionOptionShouldResume;
switch (interruptionType.integerValue) {
case AVAudioSessionInterruptionTypeBegan:
[weakSelf beginInterruption];
break;
case AVAudioSessionInterruptionTypeEnded:
[weakSelf endInterruption:shouldResume];
break;
default:
break;
}
}];
}