iphone keyboard event

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.

From stackoverflow

• 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.

  iamiPhone : This is little tricky now and involves lots of work. I was hoping to see some App level event to capture

• 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]);
  }