Szablon danych podstawowych Xcode 8 dla iOS 8,9

Question

Pracuję nad aplikacją w nowym Xcode 8 i zauważyłem oczywistą rzecz. Xcode wygenerował mi Core Data z najnowszymi referencjami API. Więc jeśli zmienię cel wdrożenia na iOS 8 lub 9, to konflikty i proponuję, aby wziąć w nawiasach: AVAILABLE mój kod Core Data. Oznacza to, że muszę napisać od zera kod Core Data z poprzedniego API. Czy ktokolwiek ma szablon AppDelegate z obiema z nich, czy może można je wygenerować przez Xcode? Z góry dziękuję!

Answer 1

Ponieważ nikt nie powinien mieć pobrać Xcode 7, zainstalować go, rozpocząć nowy projekt i port kod szablonu do szybkiej 3 tylko do wykorzystania podstawowych danych przy jednoczesnym wspieraniu iOS 8 & 9:

Swift 2 Rdzeń metody szablon dane z 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() 
     } 
    } 
} 

zamienione na szybki 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

Dzięki DCToDaylight's answer. Zrobiłem ten plik, który można po prostu przeciągnąć i upuścić. Udało mi się również, aby mój kontekst obiektu zarządzanego był statyczny, a moja metoda init była prywatna. Aby ktoś nie mógł przypadkowo utworzyć nowego kontekstu.

Funkcja o nazwie ułatwia wykonywanie każdej czynności za pomocą danych podstawowych.

Pomysł utworzenia statycznego managedObjectContext, oddzielnego pliku i funkcji pochodził od this YouTube tutorial.

Dla tego przykładu zrobiłem nowy plik o nazwie DatabaseController.swift i umieściłem tam cały ten kod. Ułatwi to zarządzanie i czytanie mojego kodu. Możesz także skopiować z // MARK: - Core Data stack na dół pliku i zastąpić podobny kod w sobie AppDelegate.swift i będzie działać.

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() 
      } 
     } 
    } 
} 

Mając na uwadze powyższe, z oczywistych względów nie można używać NSPersistantContainer, więc trzeba użyć metody Rdzeń danych stosu za pomocą managedObjectContext.

Answer 3

Jeśli potrzebujesz szybkiej poprawki, wystarczy dodać obiektywną klasę c zawierającą ogólną funkcję ogólnych danych, aby uzyskać referencje NSManagedObjectContext i NSPersistentStoreCoordinator. (Możesz znaleźć kod na SO lub na innej stronie, skontaktuj się ze mną na wypadek, gdybyś potrzebował tej klasy.)

Po dodaniu klasy użyj @Dostępna klauzula 10 iw innym miejscu dodaj kod do wzięcia referencji dla wspomnianego modelu.

Daj mi znać, jeśli ktoś znajdzie coś złego.