Sorting an Array error?

Question

I'm trying to sort an array, from a previous post I was pointed to an answer in this thread, Sorting an array of doubles or CLLocationDistance values on the iPhone

Based of this my code is as follows:

NSArray *sortedArray = [listArray sortedArrayUsingFunction:intSort context:nil];


NSInteger intSort(id num1, id num2, void *dummy)
{
    int v1 = [[num1 objectForKey:@"waypoint_order"] intValue];
    int v2 = [[num2 objectForKey:@"waypoint_order"] intValue];

    if (v1 < v2)
        return NSOrderedAscending;
    else if (v1 > v2)
        return NSOrderedDescending;
    else
        return NSOrderedSame;
}

But its crashing on line int v1 = [[num1 objectForKey:@"waypoint_order"] intValue]; with 'objc_exception_throw'.

What am I doing wrong, I must be leaving out some functionality.

Regards, Stephen

-[NSManagedObject objectForKey:]: unrecognized selector sent to instance 0x7a601f0. — Stephen
– Stephen, Commented Sep 17, 2010 at 9:43
Okay, I've just run a quick test and looped through my array output the contents of waypoint_order to the console. Details are displayed so not sure how its getting out of bounds. — Stephen
– Stephen, Commented Sep 17, 2010 at 9:46

Firoze Lafeer · Accepted Answer · 2010-09-22 19:30:33Z

1

+50

If these are NSManagedObjects, you want valueForKey:, not objectForKey:

Like this...

int v1 = [[num1 valueForKey:@"waypoint_order"] intValue];

Hope that helps.

answered Sep 22, 2010 at 19:30

Firoze Lafeer

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1 Comment

Stephen Over a year ago

Firoze, thanks very much for this, I can't believe I missed it. I should have known that. I've been working a lot with NSManagedObjects lately.

iOSPawan · Accepted Answer · 2010-09-17 09:49:15Z

1

check num1 dictionary. is it autorelease or u release it somewhere in program.
or check value return by Dictionary may be it returning nil;
see linkArray object .at the time of creating u assigned last Value to nil or not . eg:[[NSArray alloc]initWithObject:object1,object2,object3,nil];

answered Sep 17, 2010 at 9:49

iOSPawan

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2 Comments

Stephen Over a year ago

(1) Definitely not auto released and I'm not releasing it anywhere. (2) How do I do this ? (3) listArray is created from a NSFetchRequest and definitely no 'nil' value at the end.

Stephen Over a year ago

Anybody any thoughts on this, I'm still having trouble.

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