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IOS xcode microphone volume detection?

What frameworks are needed to determine how loudly someone speaks into the microphone ... Also, someone can tell me what to look in the documentation or Google so that I can create some kind of code ... What line of code will be commonly used when detecting microphone noise? Thank!

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This seems to be a duplicate:

Real-time sound level control

However, this question is old, and the accepted answer refers to an outdated library . Now they recommend using instead AVAudioRecorder. They offer this tutorial and it looks like what you are looking for.

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