ios NSArray 和 NSPredicate 使用 NOT IN
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NSArray with NSPredicate using NOT IN
提问by Slee
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.
我有一个 NSArray，我想使用 NSPredicate 过滤掉某些对象，我希望我可以使用 NOT IN，因为我看到我可以轻松地执行 IN。
So I have my array:
所以我有我的数组：
self.categoriesList
Then I get the values I want to remove:
然后我得到我想要删除的值：
NSArray *parentIDs = [self.cateoriesList valueForKeyPath:@"@distinctUnionOfObjects.ParentCategoryID"];
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:
这为我提供了我不想显示的类别的 ParentCategoryID 列表，所以我想我可以使用 NSPredicate 来删除它们：
self.cateoriesList = [self.cateoriesList filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"CategoryID NOT IN %@",parentIDs]];
This fails:
这失败了：
reason: 'Unable to parse the format string "CategoryID NOT IN %@"'
If I wanted to use just IN that works perfectly of course.
如果我只想使用 IN，那当然可以完美运行。
回答by dreamlax
What about NOT (CategoryID IN %@)?
怎么样NOT (CategoryID IN %@)？
回答by Mark Adams
How about using NONE?
怎么用NONE？
[NSPredicate predicateWithFormat:@"NONE CategoryID IN %@", parentIDs];
