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Justin
Justin

Reputation: 147

Swift: addPeriodicTimeObserverForInterval for AVAudioPlayer

I'm still trying to find a way that you can call an action when an AVAudioPlayer music file hits a specific second.

I know I could use the addPeriodicTimeObserverForInterval method from the AVPlayer class, however I do not want to use AVPlayer since it does not use methods such as playing(), stop(), numberOfLoops etc since I'm currently using them

Is there an alternative method that AVAudioPlayer uses? If so, how would I do it when the AVAudioPlayer is into 20 seconds.

Upvotes: 2

Views: 3334

Answers (1)

Duncan C
Duncan C

Reputation: 131408

I think your choices are to switch to using AVPlayer, or to "fake it" using an NSTimer, as suggested by Ashish, above, or some other method.

NSTimers aren't accurate beyond ~1/50th of a second (they run on the main thread and only fire when your app visits the run loop.)

You could try registering for KVO notification of the currentTime property of your AVAudioPlayer, and then detecting times that are within a specific second.

KVO notifications will probably be quite CPU-intensive, and may even cause the audio playing to stutter, since the KVO notice will fire every time the audio player changes the currentTime property, even if it's every 1/1000 of a second.

If you only need resolution within a second, and it doesn't have to be exact, NSTimer is the way to go.

Upvotes: 3

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