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Should a toggle button show its current state or the state to which it will change?

I was using a simple app on my iPhone yesterday (a flashlight app) and there was a button for mute.

I was confused because it seemed as if the button showed that the app was on mute, but sounds were still being played.

I figured out that the button was showing me what would happen if I pressed it. After I pressed it, it muted and the button changed from a speaker with an X through it to a full speaker (illustrating that if I were to press it again, it would become whatever the picture showed)

Is this intuitive? Should the pictures be reversed so the icon depicts what is the current state rather than what the state will become once pressed?

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marked as duplicate by Patrick McElhaney Oct 18 '11 at 16:53

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The current state should always be clearly shown. If it is obvious by some other indication that the current state has audio active, then having the button show the action (which is what buttons usually do) is fine.

However in that situation the button should break with the norm of a button displaying the action and show the state. Clarity is always more important than following a convention.

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