Handling keyboard events on cocoa

Question

I have a textbox and every time something is typed into it. I want to capture the key pressed and perform some action. For this I need to capture the keyboard event. Currently I am trying to override the keyDown: function but it wont work.

So how can I do it?

It always helps to characterize "won't work." Crashes? Nothing happens? Keys appear in box, but no keyDown messages? Code is helpful, too. And is this a NSTextField or a NSTextView? Do you really need the event itself, or just the character? — Caleb
– Caleb, Commented Jul 22, 2011 at 12:37

Matthieu Cormier · Accepted Answer · 2011-07-22 13:00:29Z

Don't override keyDown. Register for notifications when the text control text has changed. The following will work for an NSTextField:

// Listen for change events on fields [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(valueChanged:) name:@"NSControlTextDidChangeNotication" object:textField ];

...

 (void) valueChanged:(NSNotification*)notification { // TODO -- look at the stringValue of your TextField }

Girish Kolari · Accepted Answer · 2011-07-22 13:01:53Z

You can use

- (void)controlTextDidChange:(NSNotification *)aNotification

This will be use full if you need to validate the data in your textField ....

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Handling keyboard events on cocoa

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