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Re: Binding a dictionary to a table view


On Oct 31, 2005, at 1:06 PM, John C. Randolph wrote:


On Oct 31, 2005, at 10:20 AM, Scott Ellsworth wrote:



On Oct 31, 2005, at 4:43 AM, John C. Randolph wrote:



On Oct 30, 2005, at 10:28 AM, Stefan Fisk wrote:




I've considered making a value transformer, but It seems a bit dodgy.




That's exactly how to do it. You'll need to transform the dictionary into an array of objects that represent key-value pairs. Bill Bumgarner showed me how to go about this some time ago. He implemented a value transformer and a KeyValuePair class which had keys for "key" and "value". -transformedValue: returned an array of these KeyValuePair objects.


What did you do about ordering?


Nothing.


I had thought that the order of keys in a dictionary was arbitrary, and thus could change as objects were added/deleted.


That's correct.

Don't mean to be obtuse, but would that not be a real problem for a table view? Put another way, did you not allow object addition/ deletion, or did you somehow refresh the entire view if an item was added/deleted?

I am asking questions because this seems to fit a situation I am in. I have a set of object that absolutely must be in a dictionary so lookups for display are fast, but that are also displayed as an array in a tableview. A value transformer sounds like a good way to go from two structures to one, but I do not want it to suddenly bite me in the future if someone adds an item.

Scott
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References: 
 >Binding a dictionary to a table view (From: Stefan Fisk <email@hidden>)
 >Re: Binding a dictionary to a table view (From: "John C. Randolph" <email@hidden>)
 >Re: Binding a dictionary to a table view (From: Scott Ellsworth <email@hidden>)
 >Re: Binding a dictionary to a table view (From: "John C. Randolph" <email@hidden>)



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