NSDictionary 在插入数据时不返回键的排列方式？

Posted 2023-03-04

【中文标题】NSDictionary 在插入数据时不返回键的排列方式？

【英文标题】：NSDictionary not returns keys as it arranged while inserting data?

【发布时间】：2013-05-30 07:25:35

【问题描述】：

我已经设置了一个 NSDictionary 并且我希望它的键作为它的排列。但是当我打印字典日志时，它的所有键和所有键排序它会给我不同的输出。任何方式我都可以获得 NSDictionary 键，因为我已经安排了它.我的代码如下：-

titleDics=[[NSMutableDictionary alloc] init];
[titleDics setObject:@"Exchange" forKey:@"exchange"];
[titleDics setObject:@"Order No" forKey:@"nestordernumber"];
[titleDics setObject:@"Transaction Type" forKey:@"transactiontype"];
[titleDics setObject:@"Symbol Name" forKey:@"symbolname"];
[titleDics setObject:@"Price to fill" forKey:@"pricetofill"];
[titleDics setObject:@"Exchange Order ID" forKey:@"exchangeorderid"];
[titleDics setObject:@"Status" forKey:@"status"];
[titleDics setObject:@"Price Type" forKey:@"pricetype"];
[titleDics setObject:@"Duration" forKey:@"duration"];
[titleDics setObject:@"Product Code" forKey:@"productcode"];
[titleDics setObject:@"Script Name" forKey:@"scripname"];

NSLog(@"Title Dictioanry is %@",titleDics);

NSLog(@"Title dics keys are %@",[titleDics allKeys]);

NSLog(@"Title dics sorted keys are %@",[[titleDics allKeys] sortedArrayUsingSelector:@selector(compare:)]);

输出是：-----

2013-05-30 12:51:43.924 MobileTrading[1676:11303] Title Dictioanry is 
duration = Duration;
exchange = Exchange;
exchangeorderid = "Exchange Order ID";
nestordernumber = "Order No";
pricetofill = "Price to fill";
pricetype = "Price Type";
productcode = "Product Code";
scripname = "Script Name";
status = Status;
symbolname = "Symbol Name";
transactiontype = "Transaction Type";

2013-05-30 12:51:43.924 MobileTrading[1676:11303] Title dics keys are (
    nestordernumber,
    productcode,
    symbolname,
    pricetype,
    exchange,
    exchangeorderid,
    pricetofill,
    scripname,
    status,
    duration,
    transactiontype
)
2013-05-30 12:51:43.924 MobileTrading[1676:11303] Title dics sorted keys are (
    duration,
    exchange,
    exchangeorderid,
    nestordernumber,
    pricetofill,
    pricetype,
    productcode,
    scripname,
    status,
    symbolname,
    transactiontype
)

我希望这些键按照我设置为 NSDictionary 的顺序，即；

exchange,
nestordernumber,
transactiontype,
symbolname,
pricetofill,
exchangeorderid,
status,
pricetype,
duration,
productcode,
scripname,

【参考方案1】：

NSMutableDictionary 总是以无序的方式返回键。

如果您真的想维持秩序，那么您需要做一些技巧。喜欢...

1) 在您的Keys 之前添加01, 02 ,03 序列号 以按照您想要的顺序对其进行排序。

2) 修剪字符串的前两个字符并使用它。

【参考方案2】：

此链接说明将所需字典的键存储在您想要的单独数组中，然后相应地使用它们

Are keys and values in an NSDictionary ordered?