排序NSDictionary [英] Sorting NSDictionary

问题描述

我想知道是否有人可以告诉我如何排序 NSDictionary ;我想从最后一个条目开始读取，因为键是Date + Time，我想能够将它附加到 NSMutableString 。

I was wondering if someone can show me how to sort an NSDictionary; I want to read it starting from the last entry, since the key is Date + Time and I want to be able to append it to an NSMutableString. I was able to read it using an enumerator but I don't get the results I want.

感谢

推荐答案

对于你的要求，最简单的方法是从键创建一个新数组，排序，然后使用数组来引用原始字典中的项目。

For your requirements the easiest way is to create a new array from the keys, sort that, then use the array to reference items from the original dictionary.

（注意，我的比较是你自己的比较两个键的方法）。

(Note myComparison is your own method that will compare two keys).

NSMutableArray* tempArray = [NSMutableArray arrayWithArray:[myDict allKeys]]; 
[tempArray sortedArrayUsingSelector:@selector(myComparison:)];

for (Foo* f in tempArray)
{
  Value* val = [myDict objectForKey:f];
}

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