Core data Swift：使用基于选项卡的应用程序错误的核心数据：'；无法使用nil模型创建NSPersistentStoreCoordinator'；

我正在尝试在基于选项卡的应用程序中使用核心数据。但当我试图保存某些内容时，会出现以下错误：

'无法使用nil模型创建NSPersistentStoreCoordinator'

这是我的应用程序代理：

import UIKit
import CoreData

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?


func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool {
    // Override point for customization after application launch.
    return true
}

func applicationWillResignActive(application: UIApplication!) {
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

func applicationDidEnterBackground(application: UIApplication!) {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

func applicationWillEnterForeground(application: UIApplication!) {
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

func applicationDidBecomeActive(application: UIApplication!) {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

func applicationWillTerminate(application: UIApplication!) {
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

// MARK: - Core Data stack

lazy var applicationDocumentsDirectory: NSURL = {
    // The directory the application uses to store the Core Data store file. This code uses a directory named "Coders.test" in the application's documents Application Support directory.
    let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
    return urls[urls.count-1] as NSURL
    }()

lazy var managedObjectModel: NSManagedObjectModel = {
    // The managed object model for the application. This property is not optional. It is a fatal error for the application not to be able to find and load its model.
    let modelURL = NSBundle.mainBundle().URLForResource("test", withExtension: "momd")
    return NSManagedObjectModel(contentsOfURL: modelURL)
    }()

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
    // The persistent store coordinator for the application. This implementation creates and return a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
    // Create the coordinator and store
    var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("test.sqlite")
    var error: NSError? = nil
    var failureReason = "There was an error creating or loading the application's saved data."
    if coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil, error: &error) == nil {
        coordinator = nil
        // Report any error we got.
        let dict = NSMutableDictionary()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason
        dict[NSUnderlyingErrorKey] = error
        error = NSError.errorWithDomain("YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog("Unresolved error \(error), \(error!.userInfo)")
        abort()
    }

    return coordinator
    }()

lazy var managedObjectContext: NSManagedObjectContext? = {
    // Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.) This property is optional since there are legitimate error conditions that could cause the creation of the context to fail.
    let coordinator = self.persistentStoreCoordinator
    if !coordinator {
        return nil
    }
    var managedObjectContext = NSManagedObjectContext()
    managedObjectContext.persistentStoreCoordinator = coordinator
    return managedObjectContext
    }()

// MARK: - Core Data Saving support

func saveContext () {
    if let moc = self.managedObjectContext {
        var error: NSError? = nil
        if moc.hasChanges && !moc.save(&error) {
            // Replace this implementation with code to handle the error appropriately.
            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            NSLog("Unresolved error \(error), \(error!.userInfo)")
            abort()
        }
    }
}

我保存数据的功能：

func calculate(maand: UITextField!, urenGewerkt: UITextField!, uurloon: UITextField!) {
    NSLog("\(maand.text)")
    let appDel: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
    let context: NSManagedObjectContext = appDel.managedObjectContext!

    let en = NSEntityDescription.entityForName("Loon", inManagedObjectContext: context)

    //Create instance of pur data model and initialize
    var newItem = dataHandlingClass(entity: en, insertIntoManagedObjectContext: context)

    if maand.text.isEmpty && urenGewerkt.text.isEmpty && uurloon.text.isEmpty {
        NSLog("Empty")
    } else {
        newItem.maand = maand!.text
        newItem.uurGewerkert = urenGewerkt!.text
        newItem.uurLoon = uurloon!.text

        var error: NSError?

        context.save(&error)
    }


}

数据处理类：

import UIKit
import CoreData

class dataHandlingClass : NSManagedObject {
    @NSManaged var maand: String!
    @NSManaged var uurLoon: String!
    @NSManaged var uurGewerkert: String!
}

有人知道我如何修复这个错误吗

---

我看到了一些与此相关的问题，但我无法得到所需的答案。

由于您使用的是

.xcdatamodel

而不是

.scdatamodeld

，您应该按照以下方式构建模型包URL：

let modelURL = NSBundle.mainBundle().URLForResource("test", withExtension: "mom") // not momd!

---

您的项目中是否有test.xcdatamodel文件？它被添加到编译源代码中？我有一个.xcdatamodel文件是的，但我需要在哪里添加它？转到目标，选择目标，打开构建阶段选项卡，然后选中编译源代码部分。test.xcdatamodel必须在列表中。好的，我的.xcdatamodel文件在其中只是为了确保我们已经消除了任何错误：您的模型文件名是

test

所有小写字母？没有改变任何东西，我仍然得到相同的错误：-（让我们检查您的NSBundle中是否有任何*.momd或*.mom文件。以下是将您的捆绑包中的所有模型文件写入日志的代码要点：。将代码放入

应用程序（应用程序：，didFinishLaunchingWithOptions launchOptions:）

。让我们看看捆绑包中是否存在所需的模型。