Question

我有一个格式字典[Int：Any]我有一堆键值对。我想用毫秒时间格式整理字典

[169887: ["noti_type": 0, "project_name": "Design Project", "eventCount": 6, "author_pic": " /file/download/profile$2348d4f21095a01cc16a8ad9bf08f966.jpg", "canvas_name": "Design Reference #31 : Windows in NYC", "lastUpdatedAt": 1513585053629, "author_name": "Jake Kyung "],


173865: ["noti_type": 0, "project_name": "BeeCanvas DEV", "eventCount": 13, "author_pic": " &&&&   /file/download/profile$80bbc9731a859d4e083df0df8044bcde.jpg &&&&   /file/download/profile$2348d4f21095a01cc16a8ad9bf08f966.jpg", "canvas_name": "Android Release note", "lastUpdatedAt": 1513307315308, "author_name": " &&&&  Sukho Bu  &&&&  Jake Kyung "]

我的词典中有很多这样的值。我想用lastUpdatedAt值对它们进行排序，这是1513585053629毫秒格式。

我已经阅读了一些帖子，说如果我可以使用NSDate，这是可能的，

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey: @"dateOfInfo" ascending: NO];
NSArray *sortedArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

[sortDescriptor release];

但我只是想知道我是否可以使用毫秒格式而不是转换为NSDate直接实现这一目标？

Answer 1

这只是理解的演示..

NSMutableDictionary *dict1 = [[NSMutableDictionary alloc]init];
    [dict1 setObject:@"Design Project" forKey:@"project_name"];
    [dict1 setObject:@"1513585053629" forKey:@"lastUpdatedAt"];

    NSMutableDictionary *dict2 = [[NSMutableDictionary alloc]init];
    [dict2 setObject:@"BeeCanvas DEV" forKey:@"project_name"];
    [dict2 setObject:@"1513307315308" forKey:@"lastUpdatedAt"];

    NSMutableArray *arr = [[NSMutableArray alloc]init];
    [arr addObject:dict1];
    [arr addObject:dict2];
    NSLog(@"original array = %@",arr);

你可以在排序描述符中直接给出密钥名称。

    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey: @"lastUpdatedAt" ascending:YES];
    NSArray *sortedArray = [arr sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
    NSLog(@"sorted array = %@",sortedArray);

<强>输出： -

sorted array = (
        {
        lastUpdatedAt = 1513307315308;
        "project_name" = "BeeCanvas DEV";
    },
        {
        lastUpdatedAt = 1513585053629;
        "project_name" = "Design Project";
    }
)

如何使用毫秒（时间格式）对NSDictionary进行排序？

1 个答案: