NSSortDescriptor和nil值 [英] NSSortDescriptor and nil values

问题描述

我使用NSSortDescriptor以升序对NSDate对象进行排序。

I'm using an NSSortDescriptor to sort NSDate objects in an ascending order. However, I need nil dates to be at the bottom of the list, whereas at the moment they come at the top.

推荐答案

我们需要nil个日期到列表的底部，最后，我决定有nil值不是一个好主意，如果我想要什么是nil值出现在升序列表的底部，我应该设置日期为[NSDate distantFuture]，他们检查之前显示它们。事实证明，这在应用程序中也有更多的语义意义。

In the end I have decided that having nil values is not a good idea and if I want what were nil value to appear at the bottom of the ascending list I should set the dates to [NSDate distantFuture] and them check for this before displaying them. It turns out this makes more semantic sense in within the applications as well.

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