NSPredicate use array as filter

问题

I'm trying to use an array as a filter to search Core Data. The values that the fetchRequest returns should have an ID that is in the predicate's array.

let arrayOfFavoriteStampIDS = [302,2300,2309]
fetchRequest.predicate = NSPredicate(format: "itemID IN %i", argumentArray: arrayOfFavoriteStampIDS)

回答1:

Almost

fetchRequest.predicate = NSPredicate(format: "itemID IN %@", arrayOfFavoriteStampIDS)

argumentArray means something else for example

fetchRequest.predicate = NSPredicate(format: "itemID == %i OR itemID == %i OR itemID == %i", argumentArray:arrayOfFavoriteStampIDS)

In this case each item in the array must match one %i placeholder.

来源：https://stackoverflow.com/questions/40138332/nspredicate-use-array-as-filter