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I found such info:

Important: The built-in speaker may be used only if no other eligible output ports (USB, HDMI, LineOut) are connected.

https://developer.apple.com/library/content/documentation/Audio/Conceptual/AudioSessionProgrammingGuide/AudioSessionBasics/AudioSessionBasics.html

But standard iOS Clock app can use built-in speaker when 3.5 jack headphones connected.

What about bluetooth headphones? Can I send different audio streams to built-in speaker and bluetooth headphones at the same time using AVAudioSessionCategoryMultiRoute?

Marjan Shkurda
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  • Found in official apple doc about 'allowBluetooth' for audioSession "You can set this option only if the audio session category is AVAudioSessionCategoryPlayAndRecord or AVAudioSessionCategoryRecord." https://developer.apple.com/documentation/avfoundation/avaudiosessioncategoryoptions/1616518-allowbluetooth – Marjan Shkurda Jan 31 '18 at 13:34
  • Now I have another question: can I achieve my goal using CoreBluetooth instead? – Marjan Shkurda Jan 31 '18 at 13:35

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