Re: Sheet created by NSObjectContoller??
Re: Sheet created by NSObjectContoller??
- Subject: Re: Sheet created by NSObjectContoller??
- From: Peter <email@hidden>
- Date: Sat, 17 Dec 2011 20:10:09 +0100
Am 17.12.2011 um 19:59 schrieb Robert Monaghan:
> Hi Everyone,
>
> Perhaps someone can help point me in the right direction on this:
>
> I have an NSObjectController that maintains a UI for me.
> I have an NSTextField which contains numerical value. You could type in a number, which populates an NSNumber object deep inside my code..
> Magically, my NSObjectController does its thing and maintains the UI. Very cool stuff!
>
> I just recently updated my bindings for this NSTextField, so that a a Min and Max Value is respected.
Interesting! How did you do that via bindings?
> As a test, I typed a value which is outside the Min/Max value, to see what I need to implement. To my surprise, a sheet is created saying "The Value 500 is too large." It prompts the user to Discard or Keep Change.
> Where did this come from? And how do I override this?
Implement a KVC validation method for your property. I guess.
See file:///Library/Developer/Shared/Documentation/DocSets/com.apple.ADC_Reference_Library.CoreReference.docset/Contents/Resources/Documents/documentation/Cocoa/Conceptual/KeyValueCoding/Concepts/Validation.html#//apple_ref/doc/uid/20002173
> I can't find info in the docs. I do see a vague reference to a "sheet" in the NSObjectController Docs, with add/remove selectors, etc. But nothing concrete.
> Ideas?
>
> Thanks!
>
> bob.
>
>
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