Re: NSSortDescriptor not working with array of custom classes
Re: NSSortDescriptor not working with array of custom classes
- Subject: Re: NSSortDescriptor not working with array of custom classes
- From: Ken Tozier <email@hidden>
- Date: Fri, 19 Oct 2007 14:04:47 -0400
I managed to get it working but don't know why this fails
- (id) pageNumber
{
return [pagePropertiesDict objectForKey: @"page_number"]; // returns
an NSNumber
}
NSArray *sortDescriptors = [NSArray arrayWithObject:
[[NSSortDescriptor alloc] initWithKey: @"pageNumber" ascending: YES]]];
[selectedPages: sortUsingDescriptors: sortDescriptors];
------------------------------------------------------------------------
----
While this works
- (id) valueForKey:(NSString *) inKey
{
return [pagePropertiesDict objectForKey: inKey];
}
NSArray *sortDescriptors = [NSArray arrayWithObject:
[[NSSortDescriptor alloc] initWithKey: @"page_number" ascending: YES]]];
[selectedPages: sortUsingDescriptors: sortDescriptors];
I understand why the bottom works but can anyone explain why the top
fails? Seems like it should work...
Thanks for any help
Ken
On Oct 19, 2007, at 12:33 PM, Ken Tozier wrote:
Hi
I have an NSMutableArray containing instances of a custom "Page"
class and can't get NSSortDescriptor to do anything. The page class
has an accessor method for the property I want to sort.
- (id) pageNumber
{
return [pageRecord objectForKey: @"page_number"];
}
In the object that contains the page array, the sort descriptor
array is initialized like this
NSArray *sortDescriptors = [NSArray arrayWithObject:
[[NSSortDescriptor alloc] initWithKey: @"pageNumber" ascending: YES]];
And I try to use it like this
NSLog(@"before sorting: %@", selectedPages);
[selectedPages sortUsingDescriptors: sortDescriptors];
NSLog(@"after sorting: %@", selectedPages);
Regardless of the order in which I select pages, the before and
after arrays are identical. Anyone see where I'm messing up?
Thanks for any help
Ken
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