• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: IBOutlet & NSNumber
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: IBOutlet & NSNumber


  • Subject: Re: IBOutlet & NSNumber
  • From: Ken Thomases <email@hidden>
  • Date: Sun, 14 Oct 2012 00:38:39 -0500

On Oct 13, 2012, at 11:17 PM, Randy Widell wrote:

> Wow.  Woah.  OK, sorry my ignorance offends.

I didn't express offense.  At least, I didn't intend to.

>  What in the world was I trying to do…I was trying to bind the selection index of a NSComboBox to a NSNumber because the Apple Cocoa bindings document for NSComboBox says the value can be bound to a NSNumber.

It can be bound to a _property_ of some object where the type of that property is NSNumber.

> Using -init didn't seem so nonsensical to me.  It could it init with 0.  It could init with NaN.  But, you're right, -init is not listed in the NSNumber class reference and that should have been a clue.

Well, more to the point: an NSNumber is immutable.  It can only have the value it was initialized with.  So, if you instantiate one in a NIB, whether it got a value of 0 or NaN, it would be stuck with that value forever.

So, my point was: what good is it to bind a view's selection (or whatever) to a constant value?


> Anyway, cool, I just decided to use -indexOfSelectedItem on a NSComboBox outlet when the sheet finishes.

That works, but it would also have worked to bind the value binding of the NSComboBox to a property of some controller object.  My concern is that you were trying to bind it to an object (rather than a property of an object) which betrays a fundamental confusion, and I wanted to bring that out into the open so you could work through it.

Regards,
Ken


_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden


References: 
 >IBOutlet & NSNumber (From: Randy Widell <email@hidden>)
 >Re: IBOutlet & NSNumber (From: Ken Thomases <email@hidden>)
 >Re: IBOutlet & NSNumber (From: Randy Widell <email@hidden>)

  • Prev by Date: Re: IBOutlet & NSNumber
  • Next by Date: Re: copy in WebView
  • Previous by thread: Re: IBOutlet & NSNumber
  • Next by thread: Plus sign key equivalent.
  • Index(es):
    • Date
    • Thread