Siri shortcuts is a big headline feature Apple introduced with iOS 12. It allows users to add custom phrases to Siri for specific actions offered by apps. These shortcut actions can be offered by the app to the users in multiple ways. One important way is to show a button inside the app.
You can design a custom button but Apple encourages you to use the official INUIAddVoiceShortcutButton. You can define its appearance (black or white) and it offers some pretty nice functionality if it is used correctly.
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