detect-arrow-keys-in-uikit's Introduction
How to Detect Arrow Keys in UIKit Problem: When implemented on a UIView or ViewController class, UIKeyCommand and -pressesBegan:withEvent: can detect 'normal' keys (letters, digits, etc) but not the arrow keys on a physical keyboard. Solution: Kludge a UITextField subclass into the responder chain. And pray Apple doesn't break this in a future iOS update. Implementation: 1. Define a UITextField subclass, KeyWatcher, that implements -keyPresses. 2. In -[ViewController viewDidLoad], instantiate KeyWatcher. 3. Add the watcher to the controller's view. 4. Hide the on-screen keyboard bar: watcher.autocorrectionType = UITextAutocorrectionTypeNo; watcher.inputAssistantItem.leadingBarButtonGroups = @[]; watcher.inputAssistantItem.trailingBarButtonGroups = @[]; 5. In -[ViewController viewDidAppear:], add the watcher to the beginning of the responder chain so it handles input events. -- This code is released into the Public Domain.
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