Question

我正在尝试使用Xcode 6.3.1中的Swift将元素插入到Core Data中，我收到了一个错误。我已经采用了几个Stackoverflow答案的解决方案（在底部列出），但没有一个能帮助解决问题。

我创建了另一个应用程序来简化代码和问题，希望它能为有此问题的其他人提供更大的好处。

错误： CoreData：警告：无法为实体'Test'加载名为'Scratch.Test'的类。找不到类，而是使用默认的NSManagedObject。

守则： （更新：预先修复）

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(true)
    let saveData = saveDataLabel.text
    println(saveData)

    let appDel = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDel.managedObjectContext!
    let en = "Test"
    let entity = NSEntityDescription.entityForName(en, inManagedObjectContext: context)
    let test = Test(entity: entity!, insertIntoManagedObjectContext: context)
    test.saveMe = saveData!
    var error: NSError?
    if !context.save(&error){
        println("Could not save \(error), \(error?.userInfo)")
    }

    //        let fetchRequest = NSFetchRequest(entityName: "Test")
    //        let fetchedEntities = appDel.managedObjectContext!.executeFetchRequest(fetchRequest, error: nil) as! [Test]
    //
    //        if(fetchedEntities.count == 0){
    //            NSLog("I'm empty")
    //        } else {
    //            NSLog("\(fetchedEntities[0].saveMe)")
    //        }

}

数据模型 道歉，我是新来的，不允许发布图片
应用程序名称：Scratch
- Scratch.xcdatamodeld
- - 测试（ Class = Scratch.Test）
- - - saveMe（as String）

Test.swift中的代码


        import Foundation
        import CoreData

        @objc(Test)
        class Test: NSManagedObject {

              @NSManaged var saveMe: String

        }

AppDelegate.swift中的代码


import UIKit
import CoreData

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

    // 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 "self.com.AG.TaskIt" 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("Scratch", 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("Scratch.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.
            var dict = [String: AnyObject]()
            dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
            dict[NSLocalizedFailureReasonErrorKey] = failureReason
            dict[NSUnderlyingErrorKey] = error
            error = NSError(domain: "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 == nil {
            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()
            }
        }
    }

}

我找不到任何能让我超越此错误的内容。以下是我发现的一些不起作用的解决方案：

Answer 1

更新：所以这是一个可能的答案。

和 enter image description here

Answer 2

确保将“实用程序”面板的“数据模型检查器”中“类”下的“模块”字段设置为当前产品模块。

在我的情况下，问题是由该字段中的 Global名称空间引起的（Xcode 9.4）。

插入时出现iOS Swift CoreData错误：警告：无法加载实体

2 个答案: