I´m newbie with cocoa. I have a button and a textField in my app. I want the button disabled when the textfield is empty and enabled when the user type something.
Any point to start? Any "magic" binding in Interface Builder?
Thanks
[EDITED]
I´ve tried to set the appDelegate as the NSTextfield´s delegate and added this method (myTextfield and myButton are IBOutlets):
- (void)textDidChange:(NSNotification *)aNotification
{
if ([[myTextField stringValue]length]>0) {
[myButton setEnabled: YES];
}
else {
[myButton setEnabled: NO];
}
}
But nothing happens...
I´ve tried to set the appDelegate as the NSTextfield´s delegate and added this method (myTextfield and myButton are IBOutlets):
- (void)textDidChange:(NSNotification *)aNotification { if ([[myTextField stringValue]length]>0) { [myButton setEnabled: YES]; } else { [myButton setEnabled: NO]; } }
That's the hard way, but it should work just fine. Either you haven't hooked up the text field's delegate
outlet to this object, you haven't hooked up the myTextField
outlet to the text field, or you haven't hooked up the myButton
outlet to the button.
The other way would be to give the controller a property exposing the string value, bind the text field's value
binding to this stringValue
property, and bind the button's enabled
binding to the controller's stringValue.length
.
You could also give the controller two properties, one having a Boolean value, and set that one up as dependent upon the string property, and bind the button to that. That's a cleaner and possibly more robust solution, though it is more work.