按降序对NSArray排序 [英] Sort an NSArray in Descending Order

问题描述

我有一个 NSArray 的 NSNumber 对象，我已经成功地按升序排序使用以下：

Hey guys, I have an NSArray of NSNumber objects that I have successfully sorted in ascending order using the following:

[myArray sortedArrayUsingSelector:@selector(compare:)]

但是，我需要以降序顺序排序。我认为 compare：仅按升序排序。虽然我可以逆转 NSArray ，我很好奇是否有一个更简单或更有效的方式去做这个。

However, I need to sort this in descending order. I take it that compare: only sorts in ascending order. While I can go about reversing the NSArray, I am curious as to whether or not there is a more simpler or more effective way of going about doing this.

感谢！

EDIT ：我找到这个问题提供了一个简单的方法来反向迭代 NSArray ：

EDIT: I found this question which provides a simple way to reverse iterate an NSArray:

for (id someObject in [myArray reverseObjectEnumerator])

这很好，我想这是一个很好的简单的解决方案，但我很好奇是否有一种方法来指定排序

This works fine, I guess it's a nice simple solution, but I'm curious as to whether or not there is a way to specify sorting in descending order.

推荐答案

使用排序描述符

NSSortDescriptor* sortOrder = [NSSortDescriptor sortDescriptorWithKey: @"self" 
                                                            ascending: NO];
return [myArray sortedArrayUsingDescriptors: [NSArray arrayWithObject: sortOrder]];

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