Xcode 8 Core Data Template для iOS 8,9

Question

Я разрабатываю приложение в новом Xcode 8, и я заметил очевидную вещь. Xcode генерировал мне Core Data с последними ссылками API. Поэтому, если я изменю цель развертывания на iOS 8 или 9, это конфликтует и предложит мне взять в скобки: AVAILABLE мой код основных данных. Это означает, что мне приходится писать с нуля код Core Data из предыдущего API. У кого-нибудь есть шаблон для AppDelegate с обоими из них или, возможно, можно сделать Xcode генерировать их? Спасибо заранее!

Answer 1

Потому что никто не должен загрузить Xcode 7, установить его, создать новый проект, а порт код шаблона для быстрой 3 просто использовать основные данные, поддерживая при этом IOS 8 & 9:

Swift 2 ядра методы шаблона данных из AppDelegate.swift:

lazy var applicationDocumentsDirectory: NSURL = { 
    // The directory the application uses to store the Core Data store file. This code uses a directory named "com.cadiridris.coreDataTemplate" in the application's documents Application Support directory. 
    let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .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 = NSBundle.mainBundle().URLForResource("coreDataTemplate", withExtension: "momd")! 
    return NSManagedObjectModel(contentsOfURL: 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.URLByAppendingPathComponent("SingleViewCoreData.sqlite") 
    var failureReason = "There was an error creating or loading the application's saved data." 
    do { 
     try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil) 
    } catch { 
     // 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 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 
    var managedObjectContext = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType) 
    managedObjectContext.persistentStoreCoordinator = coordinator 
    return managedObjectContext 
}() 

// MARK: - Core Data Saving support 

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() 
     } 
    } 
} 

Старинное Свифта 3:

lazy var applicationDocumentsDirectory: URL = { 
    // The directory the application uses to store the Core Data store file. This code uses a directory named "com.cadiridris.coreDataTemplate" 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: "coreDataTemplate", 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") 
    var failureReason = "There was an error creating or loading the application's saved data." 
    do { 
     try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: nil) 
    } 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 
    var managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType) 
    managedObjectContext.persistentStoreCoordinator = coordinator 
    return managedObjectContext 
}() 

// MARK: - Core Data Saving support 

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() 
     } 
    } 
} 

Answer 2

Благодаря DCToDaylight's answer. Я сделал этот файл, который можно просто перетащить. Я также создал статический объект управляемого объекта, а метод init - закрыт. Чтобы кто-то не мог случайно создать новый контекст.

Функция, называемая getContext, упрощает каждый раз, когда вы что-то делаете с данными ядра.

Идея создания статического управляемого объекта ObjectContext, отдельного файла и функции была получена от this YouTube tutorial.

В этом примере я сделал новый файл с именем DatabaseController.swift и разместил там весь этот код. Это просто упростит мой код и прочитает его. Вы также можете скопировать файл // MARK: - Core Data stack в нижнюю часть файла и заменить аналогичный код на вас AppDelegate.swift, и он будет работать.

import Foundation 
import CoreData 

class DatabaseController { 

    private init() { 

    } 

    class func getContext() -> NSManagedObjectContext { 
     return DatabaseController.managedObjectContext 
    } 
    // MARK: - Core Data stack 

    static var managedObjectContext: NSManagedObjectContext = { 

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

     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: "YOUR_APP_NAME", withExtension: "momd")! 
      return NSManagedObjectModel(contentsOf: modelURL)! 
     }() 

     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: managedObjectModel) 
      let url = applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite") 
      var failureReason = "There was an error creating or loading the application's saved data." 
      do { 
       try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: nil) 
      } 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 
     }() 

     // 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 = persistentStoreCoordinator 
     var managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType) 
     managedObjectContext.persistentStoreCoordinator = coordinator 
     return managedObjectContext 
    }() 

    // MARK: - Core Data Saving support 

    class 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() 
      } 
     } 
    } 
} 

Это, как говорится, по понятным причинам вы не можете использовать NSPersistantContainer, так что вы должны использовать метод основных данных стека с помощью managedObjectContext.

Answer 3

Если вы хотите быстро исправить это, вам просто нужно добавить объектный класс c, содержащий основную функцию данных ядра, чтобы получить ссылку на NSManagedObjectContext и NSPsistentStoreCoordinator. (Вы можете найти код на SO или другом сайте, свяжитесь со мной, если вам нужен этот класс.)

После добавления класса используйте предложение @Available 10, а в другой части добавьте код, чтобы получить ссылку для вышеупомянутой модели.

Сообщите мне, если кто-нибудь обнаружит в этом что-то неправильное.