NSMutableDictionary

可変ディクショナリ（連想可変配列）

生成

NSMutableDictionary *mDict = [NSMutableDictionary dictionary];

要素をセット

[mDict setObject:@"hoge" forKey:@"name"];
[mDict setObject:[NSNumber numberWithInt:8] forKey:@"name"];
[mDict setObject:@"blue" forKey:@"color"];

削除

[mDict removeObjectForKey:@"name"];
[mDict removeObjectsForKeys:[[[NSArray]] arrayWithObjects:@"name", @"hoge", nil]];
[mDict removeAllObjects];

追加（同じキーがある場合は上書き）

NSMutableDictionary *mDict = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                              @"hoge", @"name",
                              [NSNumber numberWithInt:2], @"hoge",
                              @"red", @"color", nil];
[mDict1 addEntriesFromDictionary:mDict2];