NSPredicate：将CONTAINS与IN组合 [英] NSPredicate: Combine CONTAINS with IN

问题描述

我在CoreData中有一组用户，在我的应用程序中有一个搜索字段。用户拥有属性名和名称。

I have a set of users in CoreData and an search field in my application. User has the properties firstname and name.

目前我有一个谓词，如user.name CONTAINS [c]％@ OR user.firstname CONTAINS [c]％@

Currently I have a predicate like "user.name CONTAINS[c] %@ OR user.firstname CONTAINS[c] %@ "

这样做会等到用户键入完整名称（例如john smith）。即使他键入john sm，也应该找到John Smith-Object。

This works until the user types a full name like "john smith". Even if he types "john sm" the John Smith-Object should be found.

什么是将搜索项的数组（IN）与CONTAINS组合的谓词？ / p>

What is the predicate to combine an array (IN) of search terms with CONTAINS?

推荐答案

2.5年后，我可以用一个更复杂的示例在swift中回答我的问题：

2.5 years later I can answer my question with a bit more complex example in swift:

var predicateList = [NSPredicate]()

let words = filterText.componentsSeparatedByString(" ")

for word in words{

     if count(word)==0{
           continue
     }

     let firstNamePredicate = NSPredicate(format: "firstName contains[c] %@", word)
     let lastNamePredicate = NSPredicate(format: "lastName contains[c] %@", word)
     let departmentPredicate = NSPredicate(format: "department contains[c] %@", word)
     let jobTitlePredicate = NSPredicate(format: "jobTitle contains[c] %@", word)

     let orCompoundPredicate = NSCompoundPredicate(type: NSCompoundPredicateType.OrPredicateType, subpredicates: [firstNamePredicate, lastNamePredicate,departmentPredicate,jobTitlePredicate])

     predicateList.append(orCompoundPredicate)
}

request.predicate = NSCompoundPredicate(type: NSCompoundPredicateType.AndPredicateType, subpredicates: predicateList)

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