I think this should do the trick:

@implementation NSString (HexIntValue)

- (unsigned int)hexIntValue
{

    NSScanner *scanner;
    unsigned int result;

    scanner = [NSScanner scannerWithString: self];

    [scanner scanHexInt: &result];

    return result;

}

@end

Note that I would expect -hexValue to be a method of NSNumber, that
would return an NSString of the receiver's hex-value representation. I
titled the method above 'hexValueInt' to more closely match NSString's
-intValue, -floatValue, etc.

David
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