Dim volume of iPodMusicPlayer to 50% in iOS

Question

I know that you can easily set the volume property of the music player, but I want to do it smoothly like Google Maps does when they use the voiceover for navigation instructions.

I was wondering what the best way to do this is.

Thanks!

Answer 1

I would try using a repeating NSTimer. Every time the timer fires you lower the volume a bit. When it reaches the target value you invalidate the timer.

Other ways of getting a repeated event (so that you can do something in stages gradually over time) are DISPATCH_SOURCE_TYPE_TIMER and CADisplayLink. But I think a timer is probably the simplest way to get started.

If you have a pre-existing sound that you're playing, a completely different solution is to apply a fadeout to it before you start playing it (and then just play it all at the same volume, because the sound itself fades out, do you see). AVFoundation gives you the tools to do that (e.g. setVolumeRampFromStartVolume:toEndVolume:timeRange:).