编辑NSMutableDictionary子词典 [英] Editing an NSMutableDictionary sub-dictionary

问题描述

我有一些由Json文件制成的NSMutableDictionary.

I have some NSMutableDictionary that is made from Json file.

NSMutableDictionary *result=//from json string

than，我需要编辑result，其构建方式如下:

than , i need to edit that result ,which is built like :

{
    slots =     (
                {
            capacity = 1;
            slot = sybIWQGDWw;
            taken =             (
                "11:45-12:45",
                "12:45-17:45"
            );
        },
                {
            capacity = 1;
            slot = WNySjEZAmU;
            taken =             (
                "12:00-13:00",
                "13:00-18:00"
            );
        }
    );
}

要获取我拥有的所有字段的数组，

To get array of all fields i have :

   NSMutableArray *slots=[result objectForKey:@"slots"];

比我得到的所有词典都多:

than i get all dictionaries with :

 for(NSMutableDictionary *dic in slots)
            [dic setObject:@"1" forKey:@"slot"];//crash probably because i edit in for loop

现在我在尝试更改for循环中的字段时崩溃.

Now i get crash when trying to change a field in the for loop.

如何更改某个字段?

编辑

这就是我从json制作字典的方法(这比可变副本要容易！)

This is how i make the dictionary from json (which is than mutable copy to result! )

-(NSDictionary*)getDictionaryForJsonWithString:(NSString*)string
{
    NSString *dataString=string;
    NSData *myData=[dataString dataUsingEncoding:NSASCIIStringEncoding];
    NSError *error;
    NSDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:myData options:kNilOptions error:&error];
    //NSLog(@"getDictionaryForJsonWithString: data is: %@",dataDic);
    return dataDic;

}


   NSMutableDictionary *result=[[self getDictionaryForJsonWithString:json] mutableCopy];

推荐答案

从JSON创建字典时，您需要设置创建可变实例的选项，并且它可能既适用于容器又适用于叶子:

When you create the dictionary from JSON, you need to set the option to create mutable instances, and it should probably be for both containers and leaves:

option: NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves

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