从嵌套在 NSArray 中的 NSDictionary 中获取特定数据字段

发布于 2025-01-07 17:24:17 字数 825 浏览 0 评论 0原文

我有一个包含嵌套字典数据的数组，如下所示：

    [{ link : [
               { $ref: "foo", $href: "first_foo"},
               { $ref: "bar", $href: "barrrrrrr"},
               { $ref: "quz", $href: "quzzzzzzz"}]},
     { link : [
               { $ref: "foo", $href: "second_foo"},
               { $ref: "bar", $href: "barrrrrrr"},
               { $ref: "quz", $href: "quzzzzzzz"}]}]

我想选出每个字典的 foo 。想要的结果是这样的：

    [{ foo: "first_foo"}, { foo: "second_foo"}]

我尝试使用 [myArray valueForKey @"@customFilterForFoo"]，并为 NSDictionary 上的类别实现了 customFilterForFoo ，但这最终得到 <代码>*** 由于未捕获的异常“NSUnknownKeyException”而终止应用程序，原因：“[<__NSCFArray 0x6b81a10>” valueForUndefinedKey:]: 这个类不符合键 customFilterForFoo 的键值编码。'

我该如何做这样的事情？谢谢！

原文

I have a array with nested dictionary data like this:

    [{ link : [
               { $ref: "foo", $href: "first_foo"},
               { $ref: "bar", $href: "barrrrrrr"},
               { $ref: "quz", $href: "quzzzzzzz"}]},
     { link : [
               { $ref: "foo", $href: "second_foo"},
               { $ref: "bar", $href: "barrrrrrr"},
               { $ref: "quz", $href: "quzzzzzzz"}]}]

I want to pick out the foo of each dictionary. The wanting result like this:

    [{ foo: "first_foo"}, { foo: "second_foo"}]

I've tried using [myArray valueForKey @"@customFilterForFoo"], and implemented the customFilterForFoo for category on NSDictionary, but this ends up with *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSCFArray 0x6b81a10> valueForUndefinedKey:]: this class is not key value coding-compliant for the key customFilterForFoo.'

How can i do something like this? Thanks!

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心房敞 2025-01-14 17:24:17

您应该在字典数组中循环，然后在每个字典中搜索 foo 的值：

NSMutableArray *arrayOfFooValues = [[NSMutableArray alloc] init];
for (NSDictionary *aDictionary in myArray) {
      if ([aDictionary valueForKey @"foo"]!= nil) {
           [arrayOfFooValues addObject:[aDictionary valueForKey @"foo"]];
      }
}

如果您想要“想要的结果”，您可以使用 setValue:forKey: 方法，但由于结果是 Foo 值的数组，因此键值编码不是并非在所有情况下都必需（除非您想在数组中添加其他内容）

You should loop in your array of dictionaries then in each one search for your foo's value :

NSMutableArray *arrayOfFooValues = [[NSMutableArray alloc] init];
for (NSDictionary *aDictionary in myArray) {
      if ([aDictionary valueForKey @"foo"]!= nil) {
           [arrayOfFooValues addObject:[aDictionary valueForKey @"foo"]];
      }
}

if you want your "wanting result" you can use the setValue:forKey: method but since the result is an array of Foo's values, key value coding isn't necessary in all cases (unless you want to add something else in your array)

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