Keyboard shortcuts: standard for Cancel button?

I implemented keyboard navigation in my iOS app. Now I'm wondering what the best shortcut might be for a "Cancel" button/action. On the Mac, I'd assume ESC is a good choice but the iPad Smart Keyboard doesn't even have that key.

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ortwin
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iPad keyboards map cmd+. to ESC, so assigning the ESC key to something like cancel is a valid and good approach.

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_mochs
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