I have a data entry form where the first field the user wants to enter is an NSDatePicker.
I wish this field to be highlighted when the user clicks a button (labelled 'New')
I have tried putting in [myDatePicker becomeFirstResponder] but this has no effect.
Can anybody show me how to set the focus to myDatePicker?
Unfortunately, becomeFirstResponder does not work that way.
As mentioned in the docs, you should send makeFirstResponder: to the window that contains the control you wish to become the first responder. In your case the window that holds your NSDatePicker.
becomeFirstResponder can be overridden in a control to return false if you do not want it to become the first responder.