ios - 在 iphone 中按日期对 NSDictionary 进行排序

Question

我有一本像这样的字典:

{
    "2014-04-12" =     (
                {
            "can_remove" = 1;
            "date_created" = "12-04-2014 04:23:57";
            "is_connected" = 0;
            name = "J J";
            status = gbn;
            "user_id" = 94;
        }
    );
    "2014-04-14" =     (
                {
            "can_remove" = 0;
            "date_created" = "14-04-2014 02:36:52";
            "is_connected" = 0;
            name = abc;
            "user_id" = 89;
        }
    );
}

这个字典的键代表日期。如何按日期排序？

我试过了，但是没用:

NSArray* keys = [dict allKeys];
    NSArray* sortedArray = [keys sortedArrayUsingComparator:^(id a, id b) {
        return [a compare:b options:NSNumericSearch];
}];

Answer 1

使用以下方式根据日期对字典进行排序:

NSMutableArray *dictKeys = [[dict allValues] mutableCopy];

[dictKeys sortUsingComparator: (NSComparator)^(NSDictionary *a, NSDictionary *b) 
  {
    NSString *key1 = [a objectForKey: @"field3"];  
    NSString *key2 = [b objectForKey: @"field3"];

    return [key1 compare: key2];
  }
];

NSLog (@"dictKeys - %@",dictKeys);