如何用键值对NSMutableDictionary进行排序？ [英] how can I sort NSMutableDictionary with keys value?

问题描述

我有一个 NSMutableDictionary ，带有字符串键，每个键都有自己的数组。我想按字母顺序用键值重新排序字典。我怎么能这样做？

I have a NSMutableDictionary with string keys and every key has its own array. I want to re-sort the dictionary with keys value alphabetically. How can I do this?

推荐答案

根据定义，字典是未排序的。

A dictionary is unsorted by definition.

为了按特定顺序迭代键，您可以对包含字典键的数组进行排序。

For iterating over the keys in a specific order, you can sort an array containing the keys of the dictionary.

NSArray *keys = [theDictionary allKeys];
NSArray *sortedKeys = [keys sortedArrayUsingSelector:@selector(compareMethod:)];

还有其他几个已排序...... 方法，例如使用 NSComparator 进行排序。看看此处。

There are several other sorted... methods, e.g. sorting with a NSComparator. Have a look here.

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