多个字典的排序数组

Question

我的数组每个对象包含三个字典。

{
    avg = {
        avg1 = 50;
        avg2 = 60;
    };

    posts =         {
        alcoholContent = 450;
        name = "BBB";
        origin = United States;

    };

    reviews =  {

        rev1 = "Test review 1";
        rev2 = "Test review 2";
    };
}

{
    avg = {
        avg1 = 30;
        avg2 = 20;
    };

    posts =         {
        alcoholContent = 550;
        name = "AAA";
        origin = United States;

    };

    reviews =  {

        rev1 = "Test review 1";
        rev2 = "Test review 2";
    };
}

我想按（后词典的）键“名称”对数组进行排序。 我该怎么做？

我使用排序描述符尝试了普通的排序方法，但是没有用

Answer 1

尝试sortUsingComparator：

[array sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    NSDictionary *dict1 = obj1;
    NSDictionary *dict2 = obj2;

    NSString *string1 = [[dict1 objectForKey:@"posts"] objectForKey:@"name"];
    NSString *string2 = [[dict2 objectForKey:@"posts"] objectForKey:@"name"];

    return [string1 compare:string2];
}];