问题
Currently migrating to swift 3 and can't quite figure out what the parser wants for NSFetchedResultsController.deleteCache(withName: "rootCache")
With this syntax, I'm getting a "Type 'String?' does not conform to protocol 'ExpressibleByStringLiteral'" error when building.
回答1:
The error message is misleading. As of Swift 3,
NSFetchedResultsController is a generic type
open class NSFetchedResultsController<ResultType : NSFetchRequestResult> : NSObject { }
and the following should work:
NSFetchedResultsController<NSFetchRequestResult>.deleteCache(withName: "rootCache")
来源：https://stackoverflow.com/questions/39517493/nsfetchedresultscontroller-deletecache-in-swift-3