CODEWITHSUNDEEP
iphoneobjective-c
Saurav Sinha
Saurav Sinha

Reputation: 41

NSSortDescriptor

Please give me suggestion, How can I solve solve this problem..  

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Weight" ascending:NO selector:@selector(localizedStandardCompare:)];
  NSArray *sortedArray = [arrayToSort sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

I am getting output :

-[__NSCFNumber length]: unrecognized selector sent to instance 0x6a81cf0
2012-05-16 09:54:21.480 MedzioSearch[2188:f803] *** WebKit discarded an uncaught exception in the webView:shouldInsertText:replacingDOMRange:givenAction: delegate: <NSInvalidArgumentException> -[__NSCFNumber length]: unrecognized selector sent to instance 0x6a81cf0

Upvotes: 0

Views: 1000

Answers (1)

Ken Thomases
Ken Thomases

Reputation: 90571

What kind of objects are in arrayToSort? What is the type of their "Weight" property?

At a guess, some of the objects have a Weight property which is an NSString while some have a Weight property which is an NSNumber. As a consequence, the sort is trying to do something like [someString localizedStandardCompare:someNumber]. Internal to -[NSString localizedStandardCompare:], it's invoking -length on the argument which is an NSNumber and doesn't recognize that selector.

By the way, property names should begin with a lowercase letter unless they begin with an acronym or initialism (like "URL" or "TIFF"). So, your property should be named "weight", not "Weight".

Upvotes: 2

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