iphone keyboard event

Question

Hello there,

Is there anyway to trap all keyboard events across my application? I need to know if user is entering anything using keyboard across my application (Application has multiple views). I was able to capture touchEvents by subclassing UIWindow but unable to capture keyboard events.

Answer 1

Not a simple answer, but I think you have two approaches available.

1. subclass the input components (UITextView, UITextField, etc) as you've done with the UIWindow.

2. Create a application wide UITextViewDelegate (and UITextFieldDelegate) and assign all your input field delegates to it.

Answer 2

Use NSNotificationCenter

[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(keyPressed:) name: UITextFieldTextDidChangeNotification object: nil];

[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(keyPressed:) name: UITextViewTextDidChangeNotification object: nil];

........

-(void) keyPressed: (NSNotification*) notification
{
  NSLog([[notification object]text]);
}