NSDictionary 获取重复值

Question

我知道这可能是一个重复的问题，但我搜索了很多但无法找到适合我的答案。

我有一个NSMutableArray，它有一个twoNSDictionary，其中包含我需要在UITableView 上填充的键和值。我已检索到 dictionary 的值，我将使用

填充该值

NSMutableArray *mutArray = [responseArray valueForKey:@"Table"];

我确实喜欢

NSMutableSet *names = [NSMutableSet set];
NSMutableArray *mutArray1 = [[NSMutableArray alloc] init];

for (id obj in mutArray) {

    NSString *destinationName = [obj valueForKey:@"AssetClassName"];

    if (![names containsObject:destinationName]) {

       [mutArray1 addObject:destinationName];
       [names addObject:destinationName];

    }
} 

因为值AssetClassName 重复了。现在我在mutArray1 中有三个值，我需要将它们显示为UITableView 部分。在AssetClassName 下，我有一些数据决定了该部分中的行。

为了检索我正在做的数据

for (int i = 0; i < [mutArray1 count]; i++) {

    NSMutableDictionary *a = [[NSMutableDictionary alloc] init];
    NSMutableDictionary *b = [[NSMutableDictionary alloc] init];

    for (NSDictionary *dict in mutArray) {

        if ([[mutArray1 objectAtIndex:i] isEqualToString:[dict valueForKey:@"AssetClassName"]]) {

           [a setObject:[dict objectForKey: @"SubAssetClassName"] forKey:@"Investment Categories"];
           [a setObject:[dict valueForKey:@"Amount"] forKey:@"Amount (EUR)"];
           [a setObject:[dict valueForKey:@"AllocationPercentage"] forKey:@"%"];
           [a setObject:[dict valueForKey:@"ModelAllocationPercentage"] forKey:@"ModelAllocationPercentage"];

           [b setObject:a forKey:[dict valueForKey:@"SubAssetClassName"]];

           [mutdict setObject:b forKey:[dict valueForKey:@"AssetClassName"]];
        }
    }
}  

mutdict 是一个全局声明的NSMutableDictionary，并在viewdidLoad 中实例化

mutdict = [[NSMutableDictionary alloc] init];

根据需要将值插入mutdict。每个SubAssetClassName 都会相应地添加到AssetclassName 中。

但我的问题是在我的最终字典中，即 mutdict 重复了 SubAssetClassName 的值。

谁能告诉我如何解决这个问题。

我的控制台

"AssetClassName" =     {

    "SubAssetClass" =         {
        "%" = 0;
        "Amount (EUR)" = 0;
        "Investment Categories" = "HIGH YIELD BONDS";
        "ModelAllocationPercentage" = 22;
    };
    "SubAssetClass" =         {
        "%" = 0;
        "Amount (EUR)" = 0;
        "Investment Categories" = "HIGH YIELD BONDS";
        "ModelAllocationPercentage" = 22;
    };
    "SubAssetClass" =         {
        "%" = 0;
        "Amount (EUR)" = 0;
        "Investment Categories" = "HIGH YIELD BONDS";
        "ModelAllocationPercentage" = 22;
    };
};
"AssetClassName" =     {
    "SubAssetClass" =         {
        "%" = 0;
        "Amount (EUR)" = 0;
        "Investment Categories" = "EMERGING MARKETS EQUITIES";
        "ModelAllocationPercentage" = 10;
    };
};
"AssetClassName" =     {
    "SubAssetClass" =         {
        "%" = 0;
        "Amount (EUR)" = 0;
        "Investment Categories" = "STRUCTURED PRODUCTS";
        "ModelAllocationPercentage" = 10;
    };
    "SubAssetClass" =         {
        "%" = 0;
        "Amount (EUR)" = 0;
        "Investment Categories" = "STRUCTURED PRODUCTS";
        "ModelAllocationPercentage" = 10;
    };
    "SubAssetClass" =         {
        "%" = 0;
        "Amount (EUR)" = 0;
        "Investment Categories" = "STRUCTURED PRODUCTS";
        "ModelAllocationPercentage" = 10;
    };
};
}

在这里我可以看到每个部分的所有SubAssetClass 值都是相同的，但实际上并非如此。

我该如何解决这个问题。

Answer 1

您需要在循环内创建一个可变字典的新实例。现在，您创建一个实例并一遍又一遍地更新它。这会导致一个字典被一遍又一遍地添加。

如下修改你的代码：

for (NSInteger i = 0; i < [mutArray1 count]; i++) {
    NSMutableDictionary *b = [[NSMutableDictionary alloc] init];

    for (NSDictionary *dict in mutArray) {
        if ([[mutArray1 objectAtIndex:i] isEqualToString:[dict valueForKey:@"AssetClassName"]]) {
           NSMutableDictionary *a = [[NSMutableDictionary alloc] init];

           [a setObject:[dict objectForKey: @"SubAssetClassName"] forKey:@"Investment Categories"];
           [a setObject:[dict valueForKey:@"Amount"] forKey:@"Amount (EUR)"];
           [a setObject:[dict valueForKey:@"AllocationPercentage"] forKey:@"%"];
           [a setObject:[dict valueForKey:@"ModelAllocationPercentage"] forKey:@"ModelAllocationPercentage"];

           [b setObject:a forKey:[dict valueForKey:@"SubAssetClassName"]];

           [mutdict setObject:b forKey:[dict valueForKey:@"AssetClassName"]];
        }
    }
}  

此外，在大多数情况下，您不应该使用valueForKey:。使用objectForKey:，除非您有明确且具体的需要使用键值编码，而不是简单地从字典中获取给定键的对象。