keyとvalueからなるタブ区切りの文字列を読み込んでdictionaryへセットするサンプル

gistfile1.m

    NSString *data = [NSString stringWithContentsOfFile:@"/tmp/a"
                                            encoding:NSUTF8StringEncoding
                                               error:nil];
    NSArray *lines;
    // 行に分解
    lines = [data componentsSeparatedByString:@"\n"];
    // コメント行を取り除く
    lines = [lines filteredArrayUsingPredicate:
             [NSPredicate predicateWithBlock:^BOOL(NSString *line, NSDictionary *bindings) {
        line = [line stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
        
        if ([line length] == 0)
            return NO;
        
        if ([line hasPrefix:@"#"])
            return NO;
        
        return YES;
    }]];
    // 行をパースしてdictionaryへセット
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    for (NSString *line in lines) {
        NSArray *keyAndValue = [line componentsSeparatedByString:@"\t"];
        NSString *key = [keyAndValue objectAtIndex:0];
        NSString *val = [keyAndValue objectAtIndex:1];
        [dict setValue:val forKey:key];
    }
    NSLog(@"%@", dict);