An object you use to check for the availability of the speech recognition service, and to initiate the speech recognition process.

Overview

An SFSpeechRecognizer object is the central object for managing the speech recognizer process. Use this object to:

• Request authorization to use speech recognition services.
• Specify the language to use during the recognition process.
• Initiate new speech recognition tasks.

Create a Great User Experience for Speech Recognition

Here are some tips to consider when adding speech recognition support to your app.

• Be prepared to handle failures caused by speech recognition limits. Because speech recognition is a network-based service, limits are enforced so that the service can remain freely available to all apps. Individual devices may be limited in the number of recognitions that can be performed per day, and each app may be throttled globally based on the number of requests it makes per day. If a recognition request fails quickly (within a second or two of starting), check to see if the recognition service became unavailable. If it is, you may want to ask users to try again later.
• Plan for a one-minute limit on audio duration. Speech recognition places a relatively high burden on battery life and network usage. To minimize this burden, the framework stops speech recognition tasks that last longer than one minute. This limit is similar to the one for keyboard-related dictation.

• Remind the user when your app is recording. For example, display a visual indicator and play sounds at the beginning and end of speech recognition to help users understand that they’re being actively recorded. You can also display speech as it is being recognized so that users understand what your app is doing and see any mistakes made during the recognition process.
• Do not perform speech recognition on private or sensitive information. Some speech is not appropriate for recognition. Don’t send passwords, health or financial data, and other sensitive speech for recognition.