NSDictionary/NSMutableDictionary関連のメモ

NDictionary

    NSDictionary *dic = @{@"手":@"手袋", @"足":@"靴下", @"頭":@"帽子"};
    NSLog(@"%@", dic[@"足"]);
    
    // 追加.
    NSMutableDictionary *mdic = [NSMutableDictionary dictionaryWithCapacity:1];
    mdic[@"first"] = @"1st";
    mdic[@"second"] = @"2nd";
    mdic[@"third"] = @"3rd";
    NSLog(@"%@", mdic);
    
    // 変更.
    mdic[@"second"] = @"SECOND";
    mdic[@"fourth"] = @"FOURTH";
    NSLog(@"%@", mdic);
    
    // 削除.
    [mdic removeObjectForKey:@"fourth"];
    NSLog(@"%@", mdic);
    [mdic removeAllObjects];
    NSLog(@"%@", mdic);
    NSLog(@"%d", mdic.count);

    // ループ.
    for (NSString *key in dic) {
        id value = dic[key];
        NSLog(@"%@ => %@", key, value);
    }
    // キーをソートしてループ.
    dic = @{@"3":@"GHI", @"1":@"ABC", @"2":@"DEF"};
    NSArray *keys = [dic keysSortedByValueUsingSelector:@selector(compare:)];
    for (NSString *key in keys) {
        NSString *value = dic[key];
        NSLog(@"%@ => %@", key, value);
    }
    // ブロック使用.
    [dic enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
        NSLog(@"%@ => %@", key, obj);
    }];