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Re: isKindOfClass returns null instead of YES or NO

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Re: isKindOfClass returns null instead of YES or NO

Subject: Re: isKindOfClass returns null instead of YES or NO
From: Andy Lee <email@hidden>
Date: Wed, 20 May 2009 23:45:18 -0400

On May 20, 2009, at 11:43 AM, Jeff Decker wrote:

NSLog(@"Is Member of NSURL: %@", [[step class] isMemberOfClass: [NSURL class]]);

The %@ placeholder is for arguments that are objects. isMemberOfClass: and isKindOfClass: return a BOOL, which is not an object. Perhaps you were expecting them to return a string @"YES" or @"NO", but that's not what they do.

You can replace the %@ with %d and you will get either a 0 (meaning NO) or a 1 (meaning YES).

See the docs on "String Format Specifiers":

<http://developer.apple.com/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html >

--Andy

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Re: isKindOfClass returns null instead of YES or NO
From: "Sean McBride" <email@hidden>


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  >isKindOfClass returns null instead of YES or NO (From: Jeff Decker <email@hidden>)




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