基于多个键，从NSArray中过滤整个NSDictionaries

问题描述

我有一个NSArray的NSDictionary对象，我想要能够返回一个新的NSDictionaries数组，其中每个NSDictionary有Area == North（例如）。

I have an NSArray of NSDictionary objects which I would like to be able to return a new array of NSDictionaries from, where every NSDictionary has "Area == North" (for example).

到目前为止，我发现的最近的例子是但是这只返回给定键的唯一值，而不是具有该键的字典。有没有办法执行类似的操作，并返回整个字典？

The closest example I have found so far is Using NSPredicate to filter an NSArray based on NSDictionary keys but this just returns the unique values for a given key, not the dictionary that has that key. Is there any way to perform a similar operation, and to return the entire dictionary?

推荐答案

听起来很容易：

NSArray *unfilteredDictionaries;  // however you get this...
NSMutableArray *filteredDictionaries = 
  [NSMutableArray arrayWithCapacity:[unfilteredDictionaries count]];
NSDictionary *dict;
for (dict in unfilteredDictionaries)
   if ([[dict valueForKey:@"Area"] isEqualToString:@"North"])
     [filteredDictionaries addObject:dict];

return filteredDictionaries;

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