IF ([myArray containsObject:term]) {...}

IF ([myArray indexOfObjectPassingTest:^(id obj, NSUInteger idx, BOOL *STOP){
         RETURN [obj caseInsensitiveCompare:term] == NSOrderedSame;
     }] != NSNotFound) {
    // there's at least one object that matches term case-insensitively
}

- (BOOL)containsObject:(id)anObject