按字典中键的值对字典的 NSArray 进行排序 [英] Sorting NSArray of dictionaries by value of a key in the dictionaries

问题描述

我有一个由字典填充的数组，我需要按字典的其中一个键的值按字母顺序对数组进行排序.

I have an array populated by dictionaries, and I need to sort the array alphabetically by the values of one of the keys of the dictionaries.

这是我的数组:

tu dictus: (
    {
    brand = Ryul;
    productTitle = Any;
    quantity = 1;
    subBrand = "Ryul INJ";
    type = Product;
},
    {
    brand = Trol;
    productTitle = Different;
    quantity = 2;
    subBrand = "";
    type = Brand;
},
    {
    brand = Dtor;
    productTitle = Any;
    quantity = 1;
    subBrand = "";
    type = Product;
},
    {
    brand = Ryul;
    productTitle = Different;
    quantity = 2;
    subBrand = "Ryul CHES";
    type = SubBrand;
},
    {
    brand = Anan;
    productTitle = Any;
    quantity = 1;
    subBrand = "";
    type = Product;
}
)

通常用于排序数组我会使用

Normally for sorting an array I will use

myArray = [uniqueProdsArray sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

但是如何使用字典的brand键进行排序?

But how do sort using the brand key of the dictionary?

推荐答案

我认为这样做可以:

brandDescriptor = [[NSSortDescriptor alloc] initWithKey:@"brand" ascending:YES];
sortDescriptors = [NSArray arrayWithObject:brandDescriptor];
sortedArray = [myArray sortedArrayUsingDescriptors:sortDescriptors];

我从 排序描述符编程主题.此外，键值编码开始发挥作用，在sortedArrayUsingDescriptors: 会向 myArray 中的每个元素发送一个 valueForKey:，然后使用标准比较器对返回值进行排序.

I pulled the code from Sort Descriptor Programming Topics. Also, Key-Value Coding comes into play, in that sortedArrayUsingDescriptors: will send a valueForKey: to each element in myArray, and then use standard comparators to sort the returned values.

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