Which delegate method I should use to respond to clicks on a text field?

I want to open a panel when the user clicks on a text field. I think I should use a delegate method that responds to the click event. I found that the

- (void)textDidBeginEditing:(NSNotification *)aNotification

method does not work, and that the

- (void)controlTextDidBeginEditing:(NSNotification *)aNotification

method works, but only when I edit the text in the text field, not then I click it. If I edit the text again, this method does not work. Why?

From stackoverflow

• The textFieldDidBeginEditing: delegate method only gets triggered when the user starts editing the text inside the UITextField, as the method name implies.

  If you want to trigger a method when the UITextField is touched, you should try this:

  [textField addTarget:self 
                action:@selector(textFieldTouched:)
      forControlEvents:UIControlEventTouchDown];
  
  - (void) textFieldTouched:(id)sender {
      // Display the panel
  }
  

  jin : Sorry, I think I want to use this on mac , not on iphone,How to do with it with cocoa?

• The correct delegate method name is

  - (void)textFieldDidBeginEditing:(UITextField *)textField
  

  From the documentation:

  This method notifies the delegate that the specified text field just became the first responder.

• Sorry, I think I want to use this on mac , not on iphone,How to do with it with cocoa?