使用NOT IN的NSArray与NSPredicate [英] NSArray with NSPredicate using NOT IN

问题描述

我有一个NSArray，我想使用NSPredicate过滤掉某些对象，我希望可以使用NOT IN，因为我看到自己可以轻松地进行IN.

I have an NSArray that I want to filter out certain objects using an NSPredicate, I was hoping I could use NOT IN since I saw that I can easily do an IN.

所以我有我的数组:

self.categoriesList

然后我得到了要删除的值:

Then I get the values I want to remove:

NSArray *parentIDs = [self.cateoriesList valueForKeyPath:@"@distinctUnionOfObjects.ParentCategoryID"];

这为我提供了我不想显示的类别的ParentCategoryID列表，因此我认为可以使用NSPredicate删除它们:

This gives me a list of ParentCategoryID's for categories I DO NOT want to display, so I figure I can use an NSPredicate to remove them:

self.cateoriesList = [self.cateoriesList filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"CategoryID NOT IN %@",parentIDs]];

此操作失败:

reason: 'Unable to parse the format string "CategoryID NOT IN %@"'

如果我只想使用IN，那当然很好.

If I wanted to use just IN that works perfectly of course.

推荐答案

NOT (CategoryID IN %@)呢?

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