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我有一个数组，我将其作为 Json 字符串放入下面的字典数组中

 {
        StockData =     (
                    {
                Id = 3;
                Name = Banana;
                Price = "1.5";
                Requests = "";
                Size = 1Kg;
                Subname = "";
                Type = Fruit;
            },
                    {
                Id = 4;
                Name = Carrot;
                Price = 2;
                Requests = "";
                Size = 1Kg;
                Subname = "";
                Type = Vegetable;
            },
                    {
                Id = 15;
                Name = Kiwi;
                Price = "1.3";
                Requests = "";
                Size = 1kg;
                Subname = "";
                Type = Fruit;
            },
                    {
                Id = 5;
                Name = Parsnips;
                Price = "1.75";
                Requests = "";
                Size = 1kg;
                Subname = Large;
                Type = Vegetable;
            },
                    {
                Id = 14;
                Name = s;
                Price = 0;
                Requests = "";
                Size = s;
                Subname = s;
                Type = s;
            },
                    {
                Id = 13;
                Name = a;
                Price = 0;
                Requests = "";
                Size = a;
                Subname = a;
                Type = a;
            },
                    {
                Id = 12;
                Name = Brocoli;
                Price = 2;
                Requests = "";
                Size = 1Kg;
                Subname = "";
                Type = Vegetable;
            }
        );
    }

然后调用以下方法。我使用 NSManagedObjectSubclass (StockArray) 并尝试从数据模型中获取属性并用数组中的内容填充它们。

+ (StockArray *)stockWithStockInfo:(NSDictionary *)stockInfo
                inManagedObjectContext:(NSManagedObjectContext *)context


    {
        StockArray *stock = nil;

        MySingletonCentre *tmp = [MySingletonCentre sharedSingleton];





        NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"StockData"];
        //NSLog(@"Log request %@", request);
        request.predicate =[NSPredicate predicateWithFormat:@"unique = %@", [tmp.stockDict objectForKey:@"Id"]];
        NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
        request.sortDescriptors = [NSArray arrayWithObject:sortDescriptor];

        NSError *error =nil;
        NSArray *matches = [context executeFetchRequest:request error:&error];
        if(!matches || ([matches count] > 1)){
            NSLog(@"Log StockArray+Stock.h%@", @"error");
            // NSLog(@"Log stock array??????1 %@", stock);
        }



        else if
            ([matches count] ==0){
            stock = [NSEntityDescription insertNewObjectForEntityForName:@"StockData" inManagedObjectContext:context];
         NSLog(@"Log %@", stock);


            stock.unique = [tmp.globalStockArray valueForKeyPath:@"Id" ] ;
            //
            stock.type =[tmp.globalStockArray valueForKeyPath:@"Type"];
            stock.name =[tmp.globalStockArray valueForKeyPath:@"Name"];
            stock.subName =[tmp.globalStockArray valueForKeyPath:@"Subname" ] ;
            stock.price =[tmp.globalStockArray valueForKeyPath:@"Price"];
            stock.size =[tmp.globalStockArray valueForKeyPath:@"Size"];
            stock.requests =[tmp.globalStockArray valueForKeyPath:@"Requests"];

一旦完成，这些项目就是我认为适合核心数据的格式？？？

data: {
    name = "(\n    Banana,\n    Carrot,\n    Kiwi,\n    Parsnips,\n    s,\n    a,\n    Brocoli\n)";
    price = "(\n    \"1.5\",\n    2,\n    \"1.3\",\n    \"1.75\",\n    0,\n    0,\n    2\n)";
    requests = "(\n    \"\",\n    \"\",\n    \"\",\n    \"\",\n    \"\",\n    \"\",\n    \"\"\n)";
    size = "(\n    1Kg,\n    1Kg,\n    1kg,\n    1kg,\n    s,\n    a,\n    1Kg\n)";
    subName = "(\n    \"\",\n    \"\",\n    \"\",\n    Large,\n    s,\n    a,\n    \"\"\n)";
    type = "(\n    Fruit,\n    Vegetable,\n    Fruit,\n    Vegetable,\n    s,\n    a,\n    Vegetable\n)";
    unique = "(\n    3,\n    4,\n    15,\n    5,\n    14,\n    13,\n    12\n)";
})

我已经尝试了大约五天，在阅读和观看了许多教程之后，我仍然找不到该怎么做。我想知道格式是否错误。似乎我是如此接近，因为上述两种格式似乎都以正确的方式显示数据。

我只写了四个月的代码，我只完成了一个应用程序，所以这对我来说仍然是一个学习曲线。

我不仅不确定要使用哪种格式，我还想知道保存方法。

我现在有以下代码，它保存，但将其全部保存到一行。如果我在“for (NSDictionary *dict in self.arrayToUseOnTableView)”循环中放置一个日志，那么该日志会带回与数组中相同数量的日志，但似乎不是为每个字典提供一个实体它把它们合二为一。

-(void) saveJSONToCoreData{

    Stock *stock = nil;
    NSManagedObjectContext *context = [self managedObjectContext];

    stock = [NSEntityDescription insertNewObjectForEntityForName:@"Stock" inManagedObjectContext:context];
    // NSLog(@"Logstock 1 %@", stock);

    for (NSDictionary *dict in self.arrayToUseOnTableView)
    {


        stock.unique = [self.arrayToUseOnTableView valueForKeyPath:@"Id" ] ;
        stock.type =[self.arrayToUseOnTableView valueForKeyPath:@"Type"];
        stock.name =[self.arrayToUseOnTableView valueForKeyPath:@"Name"];
        stock.subName =[self.arrayToUseOnTableView valueForKeyPath:@"Subname" ] ;
        stock.price =[self.arrayToUseOnTableView valueForKeyPath:@"Price"];
        stock.size =[self.arrayToUseOnTableView valueForKeyPath:@"Size"];
        stock.requests =[self.arrayToUseOnTableView valueForKeyPath:@"Requests"];


    }

      NSLog(@"Log %@", stock);

    NSError *error;
    if (![context save:&error]){
        NSLog(@"Error");
    }else{
        NSLog(@"saved");
    }


}
4

1 回答 1

0

所以最后我做了这个，它遍历字典数组并正确存储它们

Stock *stock = nil;
NSManagedObjectContext *context = [self managedObjectContext];

for (NSDictionary *dict in self.arrayToUseOnTableView)
{

    stock = [NSEntityDescription insertNewObjectForEntityForName:@"Stock" inManagedObjectContext:context];


    stock.unique = [dict valueForKeyPath:@"Id"];
    stock.type =[dict valueForKey:@"Type"];
    stock.name =[dict objectForKey:@"Name"];
    stock.subName =[dict objectForKey:@"Subname" ] ;
    stock.price =[dict objectForKey:@"Price"];
    stock.size =[dict objectForKey:@"Size"];
    stock.requests =[dict objectForKey:@"Requests"];

    NSLog(@"Log %@", stock);

[self saveContext];
于 2013-10-31T13:33:06.237 回答