我采取了Grouchal的代码，为了加快速度，我使用了并发模式的枚举(NSEnumerationConcurrent)，它比for循环快了一点(在我的应用程序中，我为测试人员添加了这个功能，以便他们可以清除数据和做测试用例，而不是删除和安装应用程序)

- (void)resetObjects
{
    [self deleteAllObjectsInEntity:@"Entity1"];
    [self deleteAllObjectsInEntity:@"Entity2"];
    [self deleteAllObjectsInEntity:@"Entity3"];
    [self deleteAllObjectsInEntity:@"Entity4"];
}

-(void) deleteAllObjectsInEntity:(NSString*) entityName
{
    MainDataContext *coreDataContext = [MainDataContext sharedInstance];
    NSManagedObjectContext *currentContext = coreDataContext.managedObjectContext;
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:currentContext];
    [fetchRequest setEntity:entity];

    NSError *error;
    NSArray *items = [currentContext executeFetchRequest:fetchRequest error:&error];

    [items enumerateObjectsWithOptions:NSEnumerationConcurrent usingBlock:^(NSManagedObject * obj, NSUInteger idx, BOOL *stop) {
        [currentContext deleteObject:obj];
    }];


    if (![currentContext save:&error]) {
        NSLog(@"Error deleting %@ - error:%@",entityName,error);
    }
}

从fileURLPath中删除sqlite，然后构建。

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) ->()) {
    var context = NSManagedObjectContext()
    if #available(iOS 10.0, *) {
        context = self.persistentContainer.viewContext
    } else {
        context = self.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)")
    }
}

iOS 10和Swift 3

假设您的实体名称是“Photo”，并且您创建了一个CoreDataStack类…

 func clearData() {
        do {            
            let context = CoreDataStack.sharedInstance.persistentContainer.viewContext
            let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Photo")
            do {
                let objects  = try context.fetch(fetchRequest) as? [NSManagedObject]
                _ = objects.map{$0.map{context.delete($0)}}
                CoreDataStack.sharedInstance.saveContext()
            } catch let error {
                print("ERROR DELETING : \(error)")
            }
        }
    }

这里有一个很好的教程，教你如何使用CoreData以及如何使用这个方法。 https://medium.com/compileswift/parsing-json-response-and-save-it-in-coredata-step-by-step-fb58fc6ce16f#.1tu6kt8qb

你可以删除SQLite文件-但我选择通过一个函数单独清除表来做到这一点:

- (void) deleteAllObjects: (NSString *) entityDescription  {
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:entityDescription inManagedObjectContext:_managedObjectContext];
    [fetchRequest setEntity:entity];

    NSError *error;
    NSArray *items = [_managedObjectContext executeFetchRequest:fetchRequest error:&error];
    [fetchRequest release];


    for (NSManagedObject *managedObject in items) {
        [_managedObjectContext deleteObject:managedObject];
        DLog(@"%@ object deleted",entityDescription);
    }
    if (![_managedObjectContext save:&error]) {
        DLog(@"Error deleting %@ - error:%@",entityDescription,error);
    }

}

我选择逐表执行的原因是，它使我在编程时确认删除表的内容是合理的，并且没有我宁愿保留的数据。

这样做会比仅仅删除文件慢得多，如果我这个方法花费太长时间，我将更改为文件删除。

龙道9+ Swift 2

删除所有实体中的所有对象

func clearCoreDataStore() {
    let entities = managedObjectModel.entities
    for entity in entities {
        let fetchRequest = NSFetchRequest(entityName: entity.name!)
        let deleteReqest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
        do {
            try context.executeRequest(deleteReqest)
        } catch {
            print(error)
        }
    }
}