我有一些执行批量删除请求的核心:extensionNSManagedObject:Clearable{///ClearsallobjectsofthistypeincoreDatastaticfuncclearAll(){letcontext=AppDelegate.sharedInstance()?.coreDataHelper.objectContext()letfetchRequest=NSFetchRequest(entityName:String(describing:self))letbatchDeleteRequest=NSBatchDeleteRequest(fetch