迅速的解决方案:

class func deleteAllManagedObjects() {

        let modelURL = NSBundle.mainBundle().URLForResource("some string", withExtension: "mom")
        let mom = NSManagedObjectModel(contentsOfURL: modelURL)

        for entityName in mom.entitiesByName.keys {
            let fr = NSFetchRequest(entityName: entityName as String)
            let a = Utility.managedObjectContext().executeFetchRequest(fr, error: nil) as [NSManagedObject]
            for mo in a {
                Utility.managedObjectContext().deleteObject(mo)
            }
        }

        Utility.managedObjectContext().save(nil)
    }

MagicalRecord使这非常简单。

[MyCoreDataObject MR_truncateAll];

假设你正在使用MagicalRecord并且有一个默认的持久性存储:

我不喜欢所有假设存在特定文件和/或要求输入实体名称或类的解决方案。这是一个Swift(2)，安全的方式删除所有实体的所有数据。删除后，它将重新创建一个新的堆栈(我实际上不确定这部分是多么必要)。

这是godo的“注销”风格的情况下，当你想删除一切，但有一个工作的存储和moc，以获得新的数据(一旦用户登录…)

extension NSManagedObject {

    class func dropAllData() {

        MagicalRecord.saveWithBlock({ context in

            for name in NSManagedObjectModel.MR_defaultManagedObjectModel().entitiesByName.keys {
                do { try self.deleteAll(name, context: context) }
                catch { print("⚠️ ✏️ Error when deleting \(name): \(error)") }
            }

            }) { done, err in
                MagicalRecord.cleanUp()
                MagicalRecord.setupCoreDataStackWithStoreNamed("myStoreName")
        }
    }

    private class func deleteAll(name: String, context ctx: NSManagedObjectContext) throws {
        let all = NSFetchRequest(entityName: name)
        all.includesPropertyValues = false

        let allObjs = try ctx.executeFetchRequest(all)
        for obj in allObjs {
            obj.MR_deleteEntityInContext(ctx)
        }

    }
}

你们都把事情搞复杂了。你可以发送你的NSManagedObjectContext重置方法

接受的答案是正确的，通过NSFileManager删除URL是正确的，但正如在iOS 5+编辑中所述，持久存储不仅仅由一个文件表示。对于SQLite存储，它是*。sqlite, *。Sqlite-shm和*。sqlite-wal……幸运的是，自从iOS 7+我们可以使用方法

[NSPersistentStoreCoordinator + removeUbiquitousContentAndPersistentStoreAtURL选项:错误:):

为了处理删除，代码应该是这样的:

NSPersistentStore *store = ...;
NSError *error;
NSURL *storeURL = store.URL;
NSString *storeName = ...;
NSPersistentStoreCoordinator *storeCoordinator = ...;
[storeCoordinator removePersistentStore:store error:&error];
[NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:storeURL.path options:@{NSPersistentStoreUbiquitousContentNameKey: storeName} error:&error];

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)")
    }
}