ios - 如何从 NSDictionary 的 NSArray 的 NSArray 迭代和检索值

Question

我对如何迭代和获取 NSDictionaries 数组(不同的类/实体)的数组感到困惑。这是我目前正在做的事情:

1) 构造两个独立的 NSDictionaries 数组(不同的实体)2)将两个数组与:

NSMutableArray *combinedArrayofDicts = [[NSMutableArray alloc] initWithObjects: sizesArrayOfDicts, wishListArrayOfDicts , nil];

3) 然后存档 combinedArrayofDicts :

NSData *dataToSend = [NSKeyedArchiver archivedDataWithRootObject:combinedArrayofDicts];

4) 通过 GameKit 传输

[self.session sendDataToAllPiers:dataToSend withDataMode: GKSendDataReliable error:nil];

5) 我将如何管理在接收端遍历这个数组？我想为每个由类名键入的类获取值:

这是它通过 NSLog 的样子(2 个 Sizes Dict 和 1 个 Wishlist Dict)

Printing description of receivedArray:
<__NSArrayM 0xbc65eb0>(
<__NSArrayM 0xbc651f0>(
{
    classname = Sizes;
    displayOrder = 0;
    share = 1;
    sizeType = Neck;
    value = "13\" or 33 (cm)";
},
{
    classname = Sizes;
    displayOrder = 0;
    share = 1;
    sizeType = Sleeve;
    value = "34\" or 86 (cm)";
}
)
,
<__NSArrayM 0xbc65e80>(
{
    classname = Wishlist;
    detail = "";
    displayOrder = 0;
    imageString = "";
    latitude = "30.33216666666667";
    link = "http://maps.google.com/maps?q=loc:30.332,-81.41";
    longitude = "-81.40949999999999";
    name = bass;
    share = 1;
    store = "";
}
)
)
(lldb)

在我的 for 循环中，我发出了这个:

NSString *value = [dict objectForKey:@"classname"];

并得到一个异常:

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0xbc651f0'

就在数组的数组中混合对象类型而言，这是不受欢迎的吗？

@Will 用正确的结构引导我找到答案。这是最终答案:

NSArray *receivedArray;
if(receivedArray.count>0){

    NSArray *combinedArrayofDicts = [receivedArray objectAtIndex:0];

    if(combinedArrayofDicts.count>=2){

        NSArray *sizesArray = [receivedArray objectAtIndex:0]; // Reference original received array
        for(NSDictionary *sizeDict in sizesArray){
            NSLog(@"%@",sizeDict);
        }

        NSArray *wishListArray = [receivedArray objectAtIndex:1]; // Reference original received array
        for(NSDictionary *wishDict in wishListArray){
            NSLog(@"%@",wishDict);
        }
    }
}

Answer 1

要获取所需的词典，请使用以下代码，
假设 receivedArray 作为从 Game center 接收的数组

NSArray *receivedArray;
if(receivedArray.count>0){
    NSArray *combinedArrayofDicts = [receivedArray objectAtIndex:0];
    if(combinedArrayofDicts.count>=2){
        NSArray *sizesArray = [combinedArrayofDicts objectAtIndex:0];
        for(NSDictionary *sizeDict in sizesArray){
            NSLog(@"%@",sizeDict);
        }
        NSArray *wishListArray = [combinedArrayofDicts objectAtIndex:1];
        for(NSDictionary *wishDict in wishListArray){
            NSLog(@"%@",wishDict);
        }
   }
}