I can’t claim any credit for coming up with the idea for this feature request – it just seemed such a no-brainer to me that I’m endorsing John Gruber’s suggestion.
Shake to Undo is problematic enough that I think Apple should have figured out something better for the iPhone by now. (For accessibility reasons, you can turn Shake to Undo off, but if you do, you don’t have any Undo at all.) My best suggestion would be to take away some space from the auto-suggestion row above the keyboard and put in an Undo button on the left, just like the iPad …
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