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我有一个字典数组，这些字典来自核心数据获取请求，结果类型为NSDictionary：

request.resultType = NSDictionaryResultType;
request.returnsDistinctResults = YES;
request.propertiesToFetch = @[@"endCalYear",@"endMonth",@"periodLength"];

样例结果NSArray如下NSDictionary：

{
    endCalYear = 2007;
    endMonth = 12;
    periodLength = 12;
},
{
    endCalYear = 2006;
    endMonth = 9;
    periodLength = 3;
},
{
    endCalYear = 2006;
    endMonth = 6;
    periodLength = 3;
},
{
    endCalYear = 2006;
    endMonth = 3;
    periodLength = 3;
}

创建（三个）单独数组的最有效方法是什么endCalYear = 2006, 2007, 2008; endMonth = 3, 9, 12 和periodLength = 3, 6, 12 来自给定的 NSArray？

谢谢！

4

1 回答 1

2

您可以使用valueForKey：

NSArray *endCalYearArray = [resultArray valueForKey:@"endCalYear"];
于 2012-10-18T12:01:45.667 回答