On Nov 13, 2008, at 01:05, Michele Barboni wrote:
Now, in an awakeFromNib: my application connect and query a MySQL
database, retrieve entries and store them as MyCustomClass
instances, then call addObject: on the NSMutableArray table.. but
nothing appears in my NSTableView..
What am I missing?
Adding objects to a NSMutableArray with addObject: is not KVO-
compliant. This means that observers of the array (e.g. your
NSArrayController) don't get notified of the change automatically.
There are two easy solutions. One is modify the NSMutableArray
compliantly. Instead of:
[table addObject: myCustomObject];
use:
[[appController mutableArrayValueForKey: @"table"] addObject:
myCustomObject];
The other is to use NSArrayController's addObject: method, which does
approximately the same thing:
[myArrayController addObject: myCustomObject];
The slight drawback to this approach is that you have to create an
IBOutlet on your app controller, and hook it up to the array
controller in IB, so that you can have a reference to the
NSArrayController to send the addObject: message to.
The other slight complication is that, in general, NSArrayController's
arrangedObjects is a sorted and filtered version of the content array.
Adding the object via the NSArrayController may put it in a different
order from adding it via the NSMutableArray. However, if you have no
sorting or filtering, the result should be the same.
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