0) Go to https://fullscreen-keyboard-lock.glitch.me. 1) Click "Go fullscreen" button. 2) Try scrolling around. 3) Unless you scroll very carefully and avoiding big scroll movements, you frequently accidentally leave fullscreen mode. Old Android solves this by having a physical Back button. New Android by listening for the Back gesture when the user swipes from the left edge of the screen toward the middle. Maybe iOS could adopt this gesture?
<rdar://problem/117689527>