Re: Sorting ABPerson array with NSSortDescriptors
Re: Sorting ABPerson array with NSSortDescriptors
- Subject: Re: Sorting ABPerson array with NSSortDescriptors
- From: Derrick Bass <email@hidden>
- Date: Wed, 28 Jun 2006 16:02:10 -0500
On Jun 28, 2006, at 12:40 PM, Gorazd Krosl wrote:
Derrick,
It is not working because you are sorting array with
one object, which is itself an array:
NSArray *sda = [NSArray arrayWithObject:sd];
NSArray *ps = [p sortedArrayUsingDescriptors:sda];
Instead you should do:
NSArray *ps = [sd sortedArrayUsingDescriptors:sda];
I'm confused by your response. I'm assuming that last statement is a
typo, because it is trying to sort the sort descriptor, but I'm not
sure what you intended.
In any case, I'm pretty sure my code is right...
p is an NSArray of ABPerson objects.
sd is an NSSortDescriptor object
sda is an array of NSSortDescriptors, which is what
sortedArrayUsingDescriptors: wants.
So [p sortedArrayUsingDescriptors:sda] should give me a sorted array.
As a test, I replaced p with an array of NSDictionarys containing the
uniqueId key, and it sorted fine with the same code. That makes me
wonder if this is a bug in the AddressBook framework or in Cocoa; but
maybe there's some reason I shouldn't expect it to work?
Derrick
PS:
Here's a complete application for people to test. Put the following
in a file, say sort.m. Then compile with the command-line:
gcc -o sort sort.m -framework Cocoa -framework AddressBook
and run with the command-line:
./sort
Code:
#import <Cocoa/Cocoa.h>
#import <AddressBook/AddressBook.h>
int main() {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSArray *p = [[[ABAddressBook sharedAddressBook] people]
subarrayWithRange:NSMakeRange(0,5)];
NSLog(@"ids of people: %@", [p valueForKeyPath:@"uniqueId"]);
NSSortDescriptor *sd = [[[NSSortDescriptor alloc]
initWithKey:@"uniqueId" ascending:YES] autorelease];
NSArray *sda = [NSArray arrayWithObject:sd];
NSArray *ps = [p sortedArrayUsingDescriptors:sda];
NSLog(@"Sorted people: %@", [ps valueForKeyPath:@"uniqueId"]);
p = [p valueForKeyPath:@"dict"]; // replace p with array of
dictionaries
ps = [p sortedArrayUsingDescriptors:sda];
NSLog(@"Sorted dicts: %@", [pds valueForKeyPath:@"uniqueId"]);
}
@implementation ABPerson (Sort)
- (NSDictionary *) dict { return [NSDictionary dictionaryWithObject:
[self uniqueId] forKey:@"uniqueId"]; }
@end
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