NSDictionary的allKeys数组搞砸了 - 不是按照它们在字典中的顺序？ [英] NSDictionary's allKeys array messed up - not in the order they are in the dictionary?

问题描述

在我的项目中，我从.plist中提取数据，更具体地说是从NSDictionary中提取数据。我使用.plist的内容初始化一个字典，效果很好。
当我这样做时

in my project I'm pulling data from a .plist, more concretely from an NSDictionary. I init a dictionary with the contents of the .plist, which works well. When I then do

NSArray *array = [dict allKeys];

它用所有键填充数组，但是以完全随机的顺序，与它们的顺序不同在.plist文件中。我真的需要保留订单。
字典中的键是数组，如果这可能导致问题。
我没有得到什么？

it fills the array with all the keys, but in a totally random order, different to the order they are in the .plist file. I would really need to preserve the order. The keys in the dictionary are arrays, if that could cause a problem. What am I not getting?

提前多多谢谢！

推荐答案

就像NSSet中的项目之间没有顺序一样，NSDictionary中的键值对没有固有的顺序。

Much like there is no order between items in an NSSet, there's is no inherent order to the key-value pairs within an NSDictionary.

如果你想要特定订单下的密钥，您需要使用类似 - （NSArray *）keysSortedByValueUsingComparator：（NSComparator）cmptr 但不会给出在plist文件中序列化NSDictionary的顺序。

If you want keys under a specific order, you'd need to use something like - (NSArray *)keysSortedByValueUsingComparator:(NSComparator)cmptr but that won't give the order in which the NSDictionary was serialized in the plist file.

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