コアデータを有効にするXcode Swift

Question

プロジェクトでコアデータを有効にしようとしています。私はすでに私のプロジェクトを通して公平な方法をとっているので、最初にコアデータを有効にするオプションが欠けています。 私はそれを有効にするのに役立つことができますか？ ありがとう

Answer 1

あなたのアプリケーションのターゲット（左のペインで、あなたのアプリの名前が付いたトップアイコン）をクリックし、 'Build Phases'タブをクリックし、 'Link Binary With Libraries' + 'をクリックし、' CoreData.framework 'を見つけてプロジェクトに追加します。

コアデータオプションを有効にして別の新しいプロジェクトを開始します。これらのメソッドを現在のプロジェクトにコピーします。これは、必要な方法に従ってプロジェクトごとに手動で行うことができます。また、追加することを忘れないでください：

import CoreData 

Answer 2

あなたが直接あなたのランニングプロジェクトのコアデータを追加することができ、プロジェクト名に行く右の選択、新しいファイルをクリックして、データモデルを選択coredata部分を形成し、あなたには、いくつかに持っていますあなたのAppDelegate.swiftファイル内のコアデータ構造....

..... AppDelegateファイルにこのコードを追加

import CoreData 

// MARK: - Core Data stack 

    lazy var applicationDocumentsDirectory: URL = { 
     // The directory the application uses to store the Core Data store file. This code uses a directory named "com.purpleapps.PixBoxNew.PixBox" in the application's documents Application Support directory. 
     let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask) 
     return urls[urls.count-1] 
    }() 

    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 = Bundle.main.url(forResource: "<<YourCoredatanamehere>>", withExtension: "momd")! 
     return NSManagedObjectModel(contentsOf: modelURL)! 
    }() 

    lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = { 
     // The persistent store coordinator for the application. This implementation creates and returns 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 
     let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel) 
     let url = self.applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite") 
     print(url) 
     var failureReason = "There was an error creating or loading the application's saved data." 
     do { 
      let myOptions = [NSMigratePersistentStoresAutomaticallyOption: true, 
          NSInferMappingModelAutomaticallyOption: true] 
      try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: myOptions) 
     } catch { 
      // Report any error we got. 
      var dict = [String: AnyObject]() 
      dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data" as AnyObject? 
      dict[NSLocalizedFailureReasonErrorKey] = failureReason as AnyObject? 

      dict[NSUnderlyingErrorKey] = error as NSError 
      let wrappedError = 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 \(wrappedError), \(wrappedError.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 
     //UNDO 
     //   var managedObjectContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType) 
     var managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType) 
     managedObjectContext.persistentStoreCoordinator = coordinator 
     return managedObjectContext 
    }() 

    lazy var writerManagedObjectContext: 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 
     var writerManagedObjectContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType) 
     // writerManagedObjectContext.persistentStoreCoordinator = coordinator 

     // [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_mocDidSaveNotification:) name:NSManagedObjectContextDidSaveNotification object:nil]; 

     NotificationCenter.default.addObserver(self, selector: #selector(AppDelegate.mocDidChangeNotification), name: NSNotification.Name.NSManagedObjectContextDidSave, object: nil) 
     return writerManagedObjectContext 
    }() 
    // MARK: - Core Data Saving support 

    func mocDidChangeNotification(_ notification : Notification){ 
     DispatchQueue.main.async { 
      self.managedObjectContext.mergeChanges(fromContextDidSave: notification) 
     } 
    } 

    func saveContext() { 
     if managedObjectContext.hasChanges { 
      do { 
       try managedObjectContext.save() 
      } catch { 
       // 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. 
       let nserror = error as NSError 
       NSLog("Unresolved error \(nserror), \(nserror.userInfo)") 
       abort() 
      } 
     } 
    }