The "correct" approach? Question about creating an NSMutableDictionary instance.
The "correct" approach? Question about creating an NSMutableDictionary instance.
- Subject: The "correct" approach? Question about creating an NSMutableDictionary instance.
- From: Michael de Haan <email@hidden>
- Date: Thu, 22 Oct 2009 18:27:08 -0700
Let me start by saying I **think** I understand why my first approach
did not work, but am interested if my working approach is correct in
concept.
Background.
As a **very long** detour from Hillegass's chapter 18 challenge, I am
following along with mmalc's excellent series of Binding examples.
Thus, now creating a table of 4 columns without bindings. (He uses 1
column, but I added a few).
In order to create the NSMutableDictionary object, which will be added
to an NSDoc Array ivar, (which will be used by the datasource methods
of a table) I have created a
Record Object with one ivar ( _record ( An NSMutableDictionary).)
which returns:
First approach: ( did **not** work)
-(id) init
{
self = ....snip...usual code
NSString * _name = @"John Doe";
NSString * _city
....snip...other string properties
_record = [ NSMutableDictionary dictionaryWithObjectsAndKeys:
_name, MDHNameKey,
....snip...
nil;
}
return self;
}
As I learnt, self returns an empty object. ( If I understand it
correctly, the local variables _name etc are no longer in scope once
self is returned.)
Second approach.
Record Object with 4 ivars viz
_name
_city etc etc
Self now returns an object whose attributes are now, in the calling
method ( the "AddRecord") used to create the NSMutableDictionary
object and added "model" array, and the table populates as expected.
May I ask if this is the correct approach? ...or should one still try
and aim to **return** a dictionary object to the calling method?
Thanks as always, in advance.
_______________________________________________
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