不区分大小写与核心数据和Swift进行比较 [英] Case Insensitive Compare with Core Data and Swift

问题描述

以下代码不起作用：

let sortDescriptor = NSSortDescriptor(key: "name", ascending: true, selector:"caseInsensitiveCompare")

并给出以下错误：
'NSInvalidArgumentException'，原因：'不受支持的NSSortDescriptor选择器：caseInsensitiveCompare'

And gives the following error: 'NSInvalidArgumentException', reason: 'unsupported NSSortDescriptor selector: caseInsensitiveCompare'

在Objective-C中似乎可以正常工作。

Seemed to work fine in Objective-C. Any ideas on why this might be?

编辑：似乎对于Core Data / SQLite来说不可能。在这种情况下，获取数组并将其按代码排序的最佳选择是什么？

seems like this may not be possible with Core Data/SQLite. In that case, is the best option to get the array and sort it in code afterwards?

推荐答案

选择器为 caseInsensitiveCompare：，带有冒号，您可以将其与Core Data一起使用。

The selector is caseInsensitiveCompare:, with the colon, and you can use it with Core Data.

使用冒号是因为方法（是 NSString 的实例方法，它接受一个参数（要比较的字符串）。

The colon is there because the method (which is an instance method of NSString) takes one argument (the string to compare with).

作为可与Core Data和SQLite
存储一起使用的排序选择器列表，可在
核心数据编程指南中的//developer.apple.com/library/tvos/documentation/Cocoa/Conceptual/CoreData/PersistentStoreFeatures.html rel = noreferrer>持久性存储类型和行为 em>。

As list of sort selectors which can be used with Core Data and a SQLite store can be found in Persistent Store Types and Behaviors in the Core Data Programming Guide.

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