The delegate receives this message each time the user attempts to change the receiver‘s value, allowing the delegate the opportunity to override the change.
- macOS 10.4+
The cell that sent the message.
On input, contains the proposed new date. The delegate may change this value before returning.
On input, contains the proposed new time interval. The delegate may change this value before returning.
When returning a new
NSDate instance should be autoreleased, and the
proposed should not be released by the delegate.
proposed are guaranteed to lie between the dates returned by
max. If you modify these values, you should ensure that the new values are within the appropriate range.