On 14 Mar '08, at 6:20 PM, norio ota wrote:
I set an action to a NSDatePicker and I'd like to know if an input value , especially year component, is different from the year of its previous date in the action method, without having a placeholder for the previous value.
Use key-value observing (KVO). You can configure it to tell you the old as well as the new value. It's all described in great detail in the documentation; read it carefully, because it gets quite tricky, though. For just this one case, it might be simpler just to store the previous value in an instance variable...
—Jens
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