本文介绍了Swift 3中的NSFetchedResultsController deleteCache的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当前正在迁移到swift 3，无法完全了解解析器对NSFetchedResultsController.deleteCache(withName: "rootCache")的需求
Currently migrating to swift 3 and can't quite figure out what the parser wants for NSFetchedResultsController.deleteCache(withName: "rootCache")
使用这种语法，我得到一个"Type'String?"构建时不符合协议"ExpressibleByStringLiteral"的错误.
With this syntax, I'm getting a "Type 'String?' does not conform to protocol 'ExpressibleByStringLiteral'" error when building.
推荐答案
该错误消息具有误导性.从Swift 3开始，NSFetchedResultsController是通用类型
The error message is misleading. As of Swift 3,NSFetchedResultsController is a generic type
open class NSFetchedResultsController<ResultType : NSFetchRequestResult> : NSObject { }
，并且以下应该起作用:
and the following should work:
NSFetchedResultsController<NSFetchRequestResult>.deleteCache(withName: "rootCache")
这篇关于Swift 3中的NSFetchedResultsController deleteCache的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！