如何按数组计数对NSArray的嵌套NSArray进行排序？ [英] how to sort an NSArray of nested NSArrays by array count?

问题描述

我有一个包含嵌套NSArrays的NSArray。我正在寻找一种方法来按照嵌套数组的对象数按升序对父数组进行排序。所以，如果 [array1 count] 为4， [array2 count] 为2且 [array3 count] 是9，我会得到：array2，array1，array3 ......

I have an NSArray that contains nested NSArrays. Im looking for a way to sort the parent array according to the object count of the nested arrays in ascending order. so if [array1 count] is 4, [array2 count] is 2 and [array3 count] is 9, i would get : array2, array1, array3...

推荐答案

那里是一些解决方案，其中之一是：

There are a few solutions, one of which is:

NSSortDescriptor *sd = [NSSortDescriptor sortDescriptorWithKey:@"@count"
                                                     ascending:YES];
NSArray *sds = [NSArray arrayWithObject:sd];
NSArray *sortedArray = [array sortedArrayUsingDescriptors:sds];

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