NSPredicate使用数组作为过滤器 [英] NSPredicate use array as filter

问题描述

我正在尝试使用数组作为过滤器来搜索核心数据. fetchRequest返回的值应具有谓词数组中的ID.

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)

推荐答案

几乎

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

argumentArray表示其他含义

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

在这种情况下，数组中的每个项目都必须匹配一个%i占位符.

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

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