I am trying to have my favourites persist when the app gets terminated and relaunches using Core Data. I made a save button to do just that but it does not seem to save the data in the way I intended and I lose the data when the app relaunches I don't get an error message. Any help is appreciated.
//this is my class for my favourites
import CoreData
enum DecoderConfigurationError: Error {
case missingManagedObjectContext
}
extension CodingUserInfoKey {
static let managedObjectContext = CodingUserInfoKey(rawValue: "managedObjectContext")!
}
@objc(CurrentPlayers)
public class CurrentPlayers: NSManagedObject, Decodable {
enum CodingKeys: String, CodingKey {
case photoUrl = "PhotoUrl"
case firstName = "FirstName"
case lastName = "LastName"
case position = "Position"
case team = "Team"
case yahooName = "YahooName"
case status = "Status"
case jerseyNumber = "Jersey"
}
public static var managedObjectContext: NSManagedObjectContext?
required public convenience init(from decoder: Decoder) throws {
guard let context = decoder.userInfo[.managedObjectContext] as? NSManagedObjectContext else {
throw DecoderConfigurationError.missingManagedObjectContext
}
self.init(context: context)
//...
let values = try decoder.container(keyedBy: CodingKeys.self)
photoUrl = try values.decode(String.self, forKey: CodingKeys.photoUrl)
firstName = try values.decode(String.self, forKey: CodingKeys.firstName)
lastName = try values.decode(String.self, forKey: CodingKeys.lastName)
position = try values.decode(String.self, forKey: CodingKeys.position)
team = try values.decode(String.self, forKey: CodingKeys.team)
yahooName = try values.decodeIfPresent(String.self, forKey: CodingKeys.yahooName)
status = try values.decode(String.self, forKey: CodingKeys.status)
jerseyNumber = try values.decodeIfPresent(Int64.self, forKey: CodingKeys.jerseyNumber) ?? 0
}
}
//this is the class that has access to the saveContext
class PersistenceService {
private init() {}
static var context: NSManagedObjectContext {
return persistentContainer.viewContext
}
// MARK: CoreData
static var persistentContainer: NSPersistentContainer = {
/*
The persistent container for the application. This implementation
creates and returns a container, having loaded 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.
*/
let container = NSPersistentContainer(name: "playerModel")
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
// Replace this implementation with code to handle the error appropriately.
// fatalError() 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.
/*
Typical reasons for an error here include:
* The parent directory does not exist, cannot be created, or disallows writing.
* The persistent store is not accessible, due to permissions or data protection when the device is locked.
* The device is out of space.
* The store could not be migrated to the current model version.
Check the error message to determine what the actual problem was.
*/
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
static func saveContext () {
let context = persistentContainer.viewContext
if context.hasChanges {
do {
try context.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// fatalError() 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
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
}
//this is my save button function
@IBAction func saveFav(_ sender: UIBarButtonItem) {
print("saved button pressed")
let saveFav = CurrentPlayers(context: context)
for o in favSet {
saveFav.yahooName = o.yahooName
saveFav.team = o.team
saveFav.position = o.position
saveFav.photoUrl = o.photoUrl
}
PersistenceService.saveContext()
}