Volume too low on iPhone when playing back the recorded file

Question

I am developing an iOS app wherein I should be able to record a sound, save it to the filesystem and then play it back from the disk. When I try to play the file off the disk, I could barely hear anything. The volume is too low. But I'm pretty sure I'd set the device volume to max. I am using AVAudioRecorder and AVAudioPlayer` for recording and playing.

Could someone please point out what the issue could be?

Answer 1

For most the solution here will probably be to use the .defaultToSpeaker option with the AVAudioSessionCategoryPlayAndRecord category:

try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, with: [.defaultToSpeaker])

But for me the issue turned out to be that a different component in my app was setting the AVAudioSessionModeMeasurement mode on the audio session, which for whatever reason reduces the output volume.