I too have been wondering how others approach this issue. For a long time I used "canRemove" and eventually switched to using my own value transformer which does the heavy lifting for me. But it's quite tedious to include this value transformer in every project I write which uses bindings like this, so I've been looking for a "built-in" alternative. So now I'm wondering if "selectedobjec...@count" is a good alternative. Have yet to try it, but it looks viable.
-Steven On Fri, Feb 19, 2010 at 8:27 AM, Ken Thomases <[email protected]> wrote: > On Feb 19, 2010, at 7:15 AM, Jerry Krinock wrote: > > > On 2010 Feb 19, at 03:02, Jean-Denis Muys wrote: > > > >> I have tried bindings to selectedObjects using the model key "count", as > a non zero count is obviously compatible with the BOOL that the property > expects. But this doesn't work: I get an error message: > >> > >> "Cannot create BOOL from object () of class __NSArray0" > > > > It means that it wants a BOOL but the selectedObjects you're giving it is > an array. > > Did you try the @count KVC operator? > > http://developer.apple.com/mac/library/documentation/cocoa/conceptual/KeyValueCoding/Concepts/ArrayOperators.html > > Using the model key "count" to an array property (selectedObjects) builds a > new array containing the results of invoking valueForKey:@"count" to each > element of selectedObjects, which isn't what you meant. > > Regards, > Ken > > _______________________________________________ > > Cocoa-dev mailing list ([email protected]) > > 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: > http://lists.apple.com/mailman/options/cocoa-dev/steven.degutis%40gmail.com > > This email sent to [email protected] > -- Steven Degutis http://www.thoughtfultree.com/ http://www.degutis.org/ _______________________________________________ Cocoa-dev mailing list ([email protected]) 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
