快速清除DB中的所有对象:

func purgeAllData() {
    let uniqueNames = persistentContainer.managedObjectModel.entities.compactMap({ $0.name })

    uniqueNames.forEach { (name) in
      let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: name)
       let batchDeleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
         do {
        try persistentContainer.viewContext.execute(batchDeleteRequest)
      } catch {
        let nserror = error as NSError
        fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
      }
   }
 }

iOS 10及以上版本

适用于所有版本。传递实体名称并遍历删除所有条目并保存上下文。

func deleteData(entityToFetch: String, completion: @escaping(_ returned: Bool) ->()) {
        let context = NSManagedObjectContext()
        context = your managedObjectContext

        let fetchRequest = NSFetchRequest<NSFetchRequestResult>()
        fetchRequest.entity = NSEntityDescription.entity(forEntityName: entityToFetch, in: context)
        fetchRequest.includesPropertyValues = false
         do {   
            let results = try context.fetch(fetchRequest) as! [NSManagedObject]
            for result in results {
                context.delete(result)
            }
            try context.save()
            completion(true)
        } catch {
            completion(false)
            print("fetch error -\(error.localizedDescription)")
        }
    }

    func deleteAll(entityName: String) {

    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: entityName)
    let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
    deleteRequest.resultType = .resultTypeObjectIDs
    guard let context = self.container?.viewContext
        else { print("error in deleteAll")
            return }

    do {
        let result = try context.execute(deleteRequest) as? NSBatchDeleteResult
        let objectIDArray = result?.result as? [NSManagedObjectID]
        let changes: [AnyHashable : Any] = [NSDeletedObjectsKey : objectIDArray as Any]
        NSManagedObjectContext.mergeChanges(fromRemoteContextSave: changes, into: [context])
    } catch {
        print(error.localizedDescription)
    }
}

Swift 3解决方案与iOS 9 'NSBatchDeleteRequest'和回退到早期的iOS版本，作为'NSManagedObjectContext'的扩展实现。苹果参考https://developer.apple.com/library/content/featuredarticles/CoreData_Batch_Guide/BatchDeletes/BatchDeletes.html

extension NSManagedObjectContext {
    func batchDeleteEntities<T: NSManagedObject>(ofType type: T.Type) throws {
        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: String(describing: type.self))
        if #available(iOS 9.0, *) {
            let request = NSBatchDeleteRequest(fetchRequest: fetchRequest)
            let result = try execute(request) as? NSBatchDeleteResult
            if let objectIDArray = result?.result as? [NSManagedObjectID] {
                let changes = [NSDeletedObjectsKey: objectIDArray]
                NSManagedObjectContext.mergeChanges(fromRemoteContextSave: changes, into: [self])
            }
        } else {
            fetchRequest.includesPropertyValues = false
            let results = try fetch(fetchRequest)
            if let actualResults = results as? [NSManagedObject], !actualResults.isEmpty {
                actualResults.forEach { delete($0) }
            }
        }
    }
}

这段代码适用于iOS 9及以下版本

class func deleteAllRecords(in entity : String) // entity = Your_Entity_Name
    {

        let context = CoreDataStack.getContext() // Note:- Replace your context here with CoreDataStack.getContext()
        let deleteFetch = NSFetchRequest<NSFetchRequestResult>(entityName: entity)
        if #available(iOS 9, *)
        {
            let deleteRequest = NSBatchDeleteRequest(fetchRequest: deleteFetch)
            do
            {
                try context.execute(deleteRequest)
                try context.save()
            }
            catch
            {
                print("There was an error:\(error)")
            }
        }
        else
        {
            do{
                let deleteRequest = try context.fetch(deleteFetch)
                for anItem in deleteRequest {
                    context.delete(anItem as! NSManagedObject)
                }
            }
            catch
            {
                print("There was an error:\(error)")
            }
        }
        CoreDataStack.saveContext() // Note:- Replace your savecontext here with CoreDataStack.saveContext()
    }

迅捷用户界面

从实体中获取实例，然后循环删除每个实例。

@Environment(\.managedObjectContext) var moc
    
@FetchRequest(sortDescriptors: []) var wizards: FetchedResults<Wizard>

var body: some View {
    VStack {
        List() { }

        Button("Delete all") {
            for wizard in wizards {
                moc.delete(wizard)
            }
            
            if moc.hasChanges {
                try? moc.save()
            }
        }
    }
}