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。

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;
}
)

通常我会使用对数组进行排序

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

但是如何使用字典的brand键进行排序呢？

最佳答案

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 Sort Descriptor Programming Topics 中提取了代码.另外，Key-Value Coding sortedArrayUsingDescriptors: 将向 myArray 中的每个元素发送一个 valueForKey:，然后使用标准比较器对返回的值进行排序.

https://stackoverflow.com/questions/9509138/