Case Insensitive Search in NSMutableDictionary

Question

HI, I have a NSMutableDicitionary contains both lowercase and uppercase keys. So currently i don't know how to find the key in the dictionary irrespective key using objective c.

Answer 1

Categories to the rescue. Ok, so it's an old post...

@interface NSDictionary (caseINsensitive)
-(id) objectForCaseInsensitiveKey:(id)aKey;
@end


@interface NSMutableDictionary (caseINsensitive)
-(void) setObject:(id) obj forCaseInsensitiveKey:(id)aKey ;
@end


@implementation NSDictionary (caseINsensitive)

-(id) objectForCaseInsensitiveKey:(id)aKey {
    for (NSString *key in self.allKeys) {
        if ([key compare:aKey options:NSCaseInsensitiveSearch] == NSOrderedSame) {
            return [self objectForKey:key];
        }
    }
    return  nil;
}
@end


@implementation NSMutableDictionary (caseINsensitive)

-(void) setObject:(id) obj forCaseInsensitiveKey:(id)aKey {
    for (NSString *key in self.allKeys) {
        if ([key compare:aKey options:NSCaseInsensitiveSearch] == NSOrderedSame) {
            [self setObject:obj forKey:key];
            return;
        }
    }
    [self setObject:obj forKey:aKey];
}

@end

enjoy.