iOS - Settings sheet dismiss button - Cancel

[JoniVR]

The readme for iOS specifies:

What you should definitely not do:

“Done” button on the left side.
“Cancel” button on either side.
“Dismiss” button on either side.

Is this documented anywhere else? A few minutes of looking around and I already found some system apps that do have a cancel button on the left. See screenshots:

Clock app	Health app	Reminders app

This makes me believe that a "Cancel" button is OK as long as it's on the left side, meaning destructive action, while the right side means "do some action with the data in this modal".

Also note that all of these modals are in the context of adding data or creating an item, which might also be important when it comes to usage.

[j-f1]

It looks like the distinction is:

• empty left side and “Done” on the right side of the nav bar if changes in the sheet are immediately saved and swiping down will do the same thing as tapping Done.
• “Cancel” on the left and some action button on the right side if changes are not saved until the sheet is dismissed and swiping down is either blocked or will revert the changes the user has made. Typically, the action button will be dimmed until a valid input has been made.

[sindresorhus]

“Cancel” button on either side.

That sentence is taken from the "app settings" section though. Modals for adding/editing are different. But we should definitely document this too.

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More discussion: https://twitter.com/blommegard/status/1340996734378528768