Well wouldn't you know it, Apple's been working on a one-handed keyboard for iPhone devices dating back to iOS 8, but it remains unfinished and of course unreleased. You can "unacknowledged" to the list of adjectives, at least officially. Unofficially, we know it exists because there's a video of the one-handed keyboard in action that developer Steve Troughton-Smith posted to Twitter.
Steve said he discovered the one-handed keyboard code while "poking around in UIKit for markup stuff." After making the discovery, Steve hacked the iOS Simulator, software Apple provides to developers for simulating iOS on Mac systems, to demonstrate the plank in action. While the keyboard code exists in iOS 10, it's been around for the past two prior major versions of Apple's mobile operating system.
Video or it didn't happen: (very hard to engage in the Simulator with a mouse cursor) pic.twitter.com/vw2wpCgiLJ— Steve T-S (@stroughtonsmith) October 19, 2016
Taking things a step further, Steve made the code available for any developers wanting to make a jailbreak tweak to turn the feature on, provided one doesn't exist already.
It's an interesting find, one that shows Apple continues to brainstorm ideas on how to make typing easier on its larger size iPhone models. We've already seen Apple roll out other features designed to make things easier to reach, notably the Reachability feature that collapses the icons after double-tapping the Home button.