How to continuously start and stop speech recognition in Swift

The following tutorial builds off Apple's Recognizing Speech in Live Audio tutorial linked below.

We recommend that you clone our Open Source Swift Starter Project, checking out the tutorial/voice branch and carrying out the steps below. The changes can be found on the tutorial/voice-loop branch.

Please note if you do this, you can skip Step One.

Setup Speech Recognition by following Apple's tutorial or following the tutorial below.

In SpeechCoordinator.swift, add the required variables. There are available in the snippet below.

Please note that we have set the algorithm to loop every 5 seconds, Apple advises to not make this more than 60 seconds as it has a high burden on the battery.

In SpeechCoordinator.swift, add the endAudioRecording function by pasting in the code below.

This can also be used to end the recording through a button or action.

In SpeechCoordinator+Transcription.swift, add the restartAudioBuffer and setRestartAudioBufferTimer functions by pasting in the code below at the bottom of the extension.

Update the In SpeechCoordinator+Availability.swift extension to call the restartAudioBuffer function instead of attempting to transcribe audio.

Update the In SpeechCoordinator.swift, in the requestAuthorization function call the restartAudioBuffer function instead of attempting to transcribe audio.

Run the app. You should now see that the speech recognition continuously loops and successfully listens to words throughout the process.