Re: Using NSDictionary in datasource
Re: Using NSDictionary in datasource
- Subject: Re: Using NSDictionary in datasource
- From: John Stiles <email@hidden>
- Date: Wed, 14 Sep 2005 18:21:53 -0700
I could be mistaken, but dictionaries tend to be a bad fit with table
data sources because there's no constant-time way, given an "index"
value, to find an item in the dictionary. Plus, since the item
ordering in a dictionary is arbitrary, the order of items in the
table would be random from an end-user perspective (and, in theory,
it could could completely rearrange itself any time you added or
removed entries).
On Sep 14, 2005, at 3:08 PM, James Gifford wrote:
Hi all,
I've got a question concerning NSDictionaries and datasources.
I understand using an NSArray to hold a list of objects to populate
an NSTableView. However, I've got some data that I am currently
storing in an NSDictionary that I would like to use in my
datasource. My question is: should I use an NSDictionary or an
array of NSDictionaries, or an array of arrays?
My data is rather simple: I've got a bunch of NSStrings and for
each one there is an NSNumber indicating how often the string
appears in another datasource. So, for instance, I might have the
pair "Bob" and 3. Currently I am using the string as the key and
the number as the value for each entry in the dictionary. The
problem is, I can't figure out how to properly implement the
datasource methods using a dictionary. The -
tableView:objectValueForTableColumn:row method looks for data based
on the index of the row, but how can I look up data in an unordered
dictionary based on an index value? I am just looking for the most
efficient way to store my data for use in the datasource.
Any help at all would be much appreciated.
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