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As long as your element has a trait .button (and UIButtons and their subclasses have that by default), users will hear it's a button and they know they need to double tap to activate it. The hint is not provided by default and not needed. Only when you have a custom element that a user might not know how to use, you can provide a hint how to activate it. But it's better to explain in a hint what will be the result of the action and not repeat the control. They should also start with a verb (not a command) e.g., "Download the document.", "Plays the song." or "Displays your accounts."