Question

我正在尝试组合两个NSMutableDictionarys，但我遇到的问题是当我添加它时它只会覆盖另一个。例如，字典A具有以下数据：

{
    StationLogs = (
                {
            log = "This is the Log Text";
            timeStamp = "2014-01-04 04:31:04 +0000";
            title = Title;
        }
    );
}

字典2会有这些数据：

{
        StationLogs = (
        {
            log = "logText";
            timeStamp = "2014-01-04 04:35:04 +0000";
            title = Title2;
        }
    );
}

我如何让他们合并看起来像这样：

    {
        StationLogs = (
        {
            log = "This is the Log Text";
            timeStamp = "2014-01-04 04:31:04 +0000";
            title = Title;
        },
        {
            log = "logText";
            timeStamp = "2014-01-04 04:35:04 +0000";
            title = Title2;
        }
    );
}

我搜索了堆栈溢出和网络的其余部分，但找不到任何东西。我很抱歉，如果这已经得到解答，我找不到它，因为我没有找到正确的短语。

谢谢，斯凯勒

Answer 1

您可以遍历每个数据集并创建合并的数据集

    NSMutableDictionary *dict1; //Your first set of data
    NSMutableDictionary *dict2; //Your second set of data

    NSArray *keys1 = [dict1 allKeys];
    NSArray *keys2 = [dict2 allKeys];

    NSMutableDictionary *combinedDictionary = [NSMutableDictionary dictionary];

    //Iterating through first data set
    for (id key in keys1) {
        NSArray *array = [dict1 objectForKey:key];

        NSMutableArray *subArray = [combinedDictionary objectForKey:key];
        if (!subArray) {
            subArray = [NSMutableArray array];
            [combinedDictionary setObject:subArray forKey:key];
        }

        [subArray addObjectsFromArray:array];
    }

    //Iterating through second data set
    for (id key in keys2) {
        NSArray *array = [dict2 objectForKey:key];

        NSMutableArray *subArray = [combinedDictionary objectForKey:key];
        if (!subArray) {
            subArray = [NSMutableArray array];
            [combinedDictionary setObject:subArray forKey:key];
        }

        [subArray addObjectsFromArray:array];
    }

您可以在已有的NSMutableDictionary替换合并数据，而不是将新combinedDictionary创建为NSMutableDictionary。

Answer 2

字典基本上是一组键值对。你的字典A和字典2说明了这一点。但是在你的组合“词典”中，你所拥有的是一组两个词典，而不是一组键值对。换句话说，就是不可能组合这样的字典，因为你期望的结果不是字典。如果您想要一组词典，请使用NSSet或NSArray（推荐）

Answer 3

这对你有帮助......

NSMutableDictionary *dict=[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"This is the Log Text",@"log",@"2014-01-04 04:31:04 +0000",@"timeStamp",@"Title",@"title", nil];

NSMutableDictionary *dict1=[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Log Text",@"log",@"2014-01-04 04:35:04 +0000",@"timeStamp",@"Title2",@"title", nil];

NSArray *arr=[NSArray arrayWithObject:dict];
NSArray *arr1=[NSArray arrayWithObject:dict1];

//here is your first dictnary
NSMutableDictionary *dictm1=[[NSMutableDictionary alloc]initWithObjectsAndKeys:arr,@"StationLogs", nil];


NSLog(@"%@",dictm1);

 //here is your second dictionary
NSMutableDictionary *dictm2=[[NSMutableDictionary alloc]initWithObjectsAndKeys:arr1,@"StationLogs", nil];
NSLog(@"%@",dictm2);

//now here you get array of dictnary which is storted with key value "StationLogs" for first didtnary
NSArray *tempArray=[[NSArray alloc]initWithArray:[dictm1 objectForKey:@"StationLogs"]];
NSLog(@"%@",tempArray);

  //now here you get array of dictnary whaich is storted with key value "StationLogs" for second didtnary
NSMutableArray *tempArray1=[[NSMutableArray alloc]initWithArray:[dictm2 objectForKey:@"StationLogs"]] ;

[tempArray1 addObjectsFromArray:tempArray];

//now adding value of second dictionary to first dict
[dictm1 setValue:tempArray1 forKey:@"StationLogs"];

NSLog(@"%@",dictm1);

如果你能让它变得简单，我就变得简单了喜欢编码

将两个NSMutableDictionary与相同的键组合在一起

3 个答案: