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Apple Developer Documentation
https://developer.apple.com/documentation/avfaudio/avaudiosessioncategoryplayandrecord
To continue playing audio when your app transitions to the background (for example, when the screen locks), add the audio value to the UIBackgroundModes key in your information property list file. This category is appropriate for simultaneous recording and playback, and also for apps that record and play back, but not simultaneously.
Apple Developer Documentation
https://developer.apple.com/documentation/avfaudio/avaudiosession/category/1616568-playandrecord
This category is appropriate for simultaneous recording and playback, and also for apps that record and play back, but not simultaneously. By default, using this category implies that your app’s audio is nonmixable—activating your session will interrupt any other audio sessions which are also nonmixable.
ios - AVAudioSession …
https://stackoverflow.com/questions/27612551/avaudiosession-avaudiosessioncategoryplayandrecord-glitch
In this case the audio routing is not touched, and it only occurs when returning from the background without deactivating the audio session. The notification that the route changes is fired twice. Once to disable the mic, and once to enable it again. Note that this behavior is easily reproducible by downloading Apple's AVCamManual example.
record - Apple Inc.
https://developer.apple.com/documentation/avfaudio/avaudiosession/category/1616451-record
Unless you need to prevent any unexpected sounds from being played, use playAndRecord instead. To continue recording audio when your app transitions to the background (for example, when the screen locks), add the audio value to the UIBackgroundModes key in your information property list file. The user must grant permission for audio recording. Note
Apple Developer Documentation
https://developer.apple.com/documentation/avfaudio/avaudiosession
You use an AVAudioSession object to configure your app’s audio session. This class is a singleton object used to set the audio session’s category, mode, and other configurations.
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