Core Data saving data with Swift - core-data

I'd like to sava data (text) if return is clicked on the keyboard. But it's not working.
I'd like to display the text, which was saved in a table view cell and it should be also available after the next start of the app.
My code:
func textFieldShouldReturn(textField: UITextField) -> Bool {
tableViewData.append(textField.text)
textField.text = ""
self.tableView.reloadData()
textField.resignFirstResponder()
// Reference to our app delegate
let appDel: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
// Reference moc
let contxt: NSManagedObjectContext = appDel.managedObjectContext!
let en = NSEntityDescription.entityForName("note", inManagedObjectContext: contxt)
// Create instance of pur data model an initialize
var newNote = Model(entity: en!, insertIntoManagedObjectContext: contxt)
// Map our properties
newNote.note = textField.text
// Save our context
contxt.save(nil)
println(newNote)
return true
}
Log:
CoreData: error: -addPersistentStoreWithType:SQLite configuration:(null) URL:file:///Users/Patti/Library/Developer/CoreSimulator/Devices/A70306D7-76BE-489A-82B3-FBAA9390D5A4/data/Containers/Data/Application/FC51C1B7-416B-463E-B976-C175642A4B34/Documents/Note_App.sqlite options:(null) ... returned error Error Domain=NSCocoaErrorDomain Code=134100 "The operation couldn’t be completed. (Cocoa error 134100.)" UserInfo=0x7fa79add8080 {metadata={
NSPersistenceFrameworkVersion = 519;
NSStoreModelVersionHashes = {
Notes = <674765e4 00e077d5 e3b4d2ca 2795eee2 42850989 4a2a825a 0c289097 387aa3a5>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "8348BBED-7C75-4EF5-B73C-075E8719696E";
"_NSAutoVacuumLevel" = 2;
}, reason=The model used to open the store is incompatible with the one used to create the store} with userInfo dictionary {
metadata = {
NSPersistenceFrameworkVersion = 519;
NSStoreModelVersionHashes = {
Notes = <674765e4 00e077d5 e3b4d2ca 2795eee2 42850989 4a2a825a 0c289097 387aa3a5>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "8348BBED-7C75-4EF5-B73C-075E8719696E";
"_NSAutoVacuumLevel" = 2;
};
reason = "The model used to open the store is incompatible with the one used to create the store";
}
2014-10-19 12:05:19.559 Note App[2450:43299] Unresolved error Optional(Error Domain=YOUR_ERROR_DOMAIN Code=9999 "Failed to initialize the application's saved data" UserInfo=0x7fa79addb450 {NSLocalizedFailureReason=There was an error creating or loading the application's saved data., NSLocalizedDescription=Failed to initialize the application's saved data, NSUnderlyingError=0x7fa79add80c0 "The operation couldn’t be completed. (Cocoa error 134100.)"}), Optional([NSLocalizedFailureReason: There was an error creating or loading the application's saved data., NSLocalizedDescription: Failed to initialize the application's saved data, NSUnderlyingError: Error Domain=NSCocoaErrorDomain Code=134100 "The operation couldn’t be completed. (Cocoa error 134100.)" UserInfo=0x7fa79add8080 {metadata={
NSPersistenceFrameworkVersion = 519;
NSStoreModelVersionHashes = {
Notes = <674765e4 00e077d5 e3b4d2ca 2795eee2 42850989 4a2a825a 0c289097 387aa3a5>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "8348BBED-7C75-4EF5-B73C-075E8719696E";
"_NSAutoVacuumLevel" = 2;
}, reason=The model used to open the store is incompatible with the one used to create the store}])

The last line of your crash log tells you what has gone wrong.
You've changed your model since running the app. You either need to enable auto migration so that such changes are corrected automatically, or just delete the app from the simulator and run it again.

Related

NSPersistentClouKitContainer creates CD_CKRecords but does not export values

I am converting existing app from NSPersistentContainer to NSPersistentCloudKitContainer
AppDelegate code:
lazy var persistentContainer: NSPersistentCloudKitContainer = {
let container = NSPersistentCloudKitContainer(name:"GridModel")
// enable history tracking and remote notifications
guard let publicStoreDescription = container.persistentStoreDescriptions.first else {
fatalError("###\(#function): failed to retrieve a persistent store description.")
}
// public
let publicStoreUrl = publicStoreDescription.url!.deletingLastPathComponent().appendingPathComponent("GridModel-public.sqlite")
publicStoreDescription.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
publicStoreDescription.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
let containerIdentifier = publicStoreDescription.cloudKitContainerOptions!.containerIdentifier
let publicStoreOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: containerIdentifier)
if #available(iOS 14.0, *) {
publicStoreOptions.databaseScope = CKDatabaseScope.public
} else {
// Fallback on earlier versions???
}
publicStoreDescription.cloudKitContainerOptions = publicStoreOptions
print(containerIdentifier)
container.loadPersistentStores(completionHandler: { (loadedStoreDescription, error) in
if let loadError = error as NSError? {
fatalError("###\(#function): Failed to load persistent stores:\(loadError)")
} else if let cloudKitContainerOptions = loadedStoreDescription.cloudKitContainerOptions {
if #available(iOS 14.0, *) {
if .public == loadedStoreDescription.cloudKitContainerOptions?.databaseScope {
self._publicPersistentStore = container.persistentStoreCoordinator.persistentStore(for: loadedStoreDescription.url!)
} else if .private == loadedStoreDescription.cloudKitContainerOptions?.databaseScope {
self._privatePersistentStore = container.persistentStoreCoordinator.persistentStore(for: loadedStoreDescription.url!)
} else if .shared == cloudKitContainerOptions.databaseScope {
self._sharedPersistentStore = container.persistentStoreCoordinator.persistentStore(for: loadedStoreDescription.url!)
}
} else {
// Fallback on earlier versions
}
} /*else if appDelegate.testingEnabled {
if loadedStoreDescription.url!.lastPathComponent.hasSuffix("private.sqlite") {
self._privatePersistentStore = container.persistentStoreCoordinator.persistentStore(for: loadedStoreDescription.url!)
} else if loadedStoreDescription.url!.lastPathComponent.hasSuffix("shared.sqlite") {
self._sharedPersistentStore = container.persistentStoreCoordinator.persistentStore(for: loadedStoreDescription.url!)
}
}*/
})
container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
container.viewContext.transactionAuthor = appTransactionAuthorName
// Pin the viewContext to the current generation token, and set it to keep itself up to date with local changes.
container.viewContext.automaticallyMergesChangesFromParent = true
do {
try container.viewContext.setQueryGenerationFrom(.current)
} catch {
fatalError("###\(#function): Failed to pin viewContext to the current generation:\(error)")
}
#if DEBUG
do {
// Use the container to initialize the development schema.
try container.initializeCloudKitSchema(options: [])
} catch {
// Handle any errors.
fatalError("###\(#function): failed to load persistent stores: \(error)")
}
#endif
// Observe Core Data remote change notifications.
NotificationCenter.default.addObserver(self,
selector: #selector(storeRemoteChange(_:)),
name: .NSPersistentStoreRemoteChange,
object: container.persistentStoreCoordinator)
return container
}()
The very first time I run, Creates all the corresponding CD CKRecords in CloudKit public database _defaultZone. All values are copied from Core Data to CloudKit.
When the app is actively running I deleted a Core Data record and added a new record it did not delete it from Cloud Kit. Also when I add a new record in Core Data it did not export and add to Cloud Kit. When the app is actively running any changes I make are not exported and updated in Cloud Kit. What changes should I make to the code?
But when I run the app again then all the previous changes that I made when the app was active are updated. So looks like it does not perform live updates until the app is rerun again.
I get another error on the Debug Console "Custom zones are not allowed in public DB". I am not writing to custom DB. I wonder if this is preventing active updates?
oreData: error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _requestAbortedNotInitialized:](1983): <NSCloudKitMirroringDelegate: 0x2824d16c0> - Never successfully initialized and cannot execute request '<NSCloudKitMirroringExportRequest: 0x280a84780> FDB61E8D-658F-4C77-8615-EF07BAB72BAD' due to error: <CKError 0x28119ba20: "Partial Failure" (2/1011); "Failed to modify some records"; uuid = 6C66A151-DB59-4A1B-B3BD-02CFB9A4139C; container ID = "iCloud.com.greenendpoint.nr2r"; partial errors: {
B-63B7-45D2-BFE0-599972FB6FD7:(com.apple.coredata.cloudkit.zone:defaultOwner) = <CKError 0x2810e44e0: "Server Rejected Request" (15/2027); server message = "Custom zones are not allowed in public DB"; op = 23AFDAC55F70DC8D; uuid = 6C66A151-DB59-4A1B-B3BD-02CFB9A4139C>
Please help!
It worked. I had to delete my app on the test device and restart again. Looks like it recreated the data store and synced with Cloud Kit.

NSManagedObject fetched into 2 different contexts has different attribute values

My app has a reproducible CoreData error.
I use the viewContext for display, and a backgroundContext for object updates. Both contexts belong to the same NSPersistentCloudKitContainer.
At some point, I save in the backgroundContext an object after updating its status attribute from 2 to 1, and its updatedAt attribute from nil to Date().
Later, I want to fetch back this updated object, and my understanding is that a fetch always returns the content of the persistent store.
Thus, the fetched object should be the same regardless into which context it is fetched. However, this is not the case.
I have also set -com.apple.CoreData.ConcurrencyDebug 1 as a launch argument, so this is not a CoreData multithreading error.
Here is my test code:
The object is saved here:
let context = backgroundContext!
context.performAndWait {
assert(ItemStatus(rawValue: item.status) == .isBought)
item.status = ItemStatus.isToBuy.rawValue
item.updatedAt = Date()
_ = saveContext(context)
}
with
func saveContext(_ context: NSManagedObjectContext) -> Error? {
if !context.hasChanges { return nil }
let inserts = context.insertedObjects; if !inserts.isEmpty { print("Will save inserted objects: \(inserts)") }
let updates = context.updatedObjects; if !updates.isEmpty { print("Will save updated objects: \(updates)") }
let deletes = context.deletedObjects; if !deletes.isEmpty { print("Will save deleted objects: \(deletes)") }
do {
try context.save()
print("\(context.name!) saved")
} catch {
fatalError("Unresolved error")
}
return nil
}
Later, I fetch the object into both contexts using:
let mwFetchRequest = NSFetchRequest<Item>(entityName: Item.entityName)
let passwordPredicate = NSPredicate(format: "\(Schema.Item.password) == %#", password)
let namePredicate = NSPredicate(format: "\(Schema.Item.name) == %#", "Mineral water")
let compoundPredicate = NSCompoundPredicate(andPredicateWithSubpredicates: [passwordPredicate, namePredicate])
mwFetchRequest.predicate = compoundPredicate
mwFetchRequest.returnsObjectsAsFaults = false
backgroundContext.performAndWait {
let bcItem = try! backgroundContext.fetch(mwFetchRequest)
print("backgroundContext: \(bcItem)")
}
viewContext.performAndWait {
let vcItem = try! viewContext.fetch(mwFetchRequest)
print(„viewContext: \(vcItem)")
}
And here is the log when I set a breakpoint after this code:
Will save updated objects: [<ShopEasy.Item: 0x600000d7cf50> (entity: Item; id: 0x9698d776a7665623 <x-coredata://35BF43D6-4CF7-490D-B944-9DDFF2823AA1/Item/p1617>; data: {
buyPlaces = "<relationship fault: 0x600002e296a0 'buyPlaces'>";
fixedAtTopAt = nil;
howOftenBought = 1;
lastBoughtDate = "2021-01-24 13:02:09 +0000";
name = "Mineral water";
password = "PW_1";
status = 1;
updatedAt = "2021-01-24 13:32:14 +0000";
})]
backgroundContext saved
…
backgroundContext: [<ShopEasy.Item: 0x600000d7cf50> (entity: Item; id: 0x9698d776a7665623 <x-coredata://35BF43D6-4CF7-490D-B944-9DDFF2823AA1/Item/p1617>; data: {
buyPlaces = "<relationship fault: 0x600002e296a0 'buyPlaces'>";
fixedAtTopAt = nil;
howOftenBought = 1;
lastBoughtDate = "2021-01-24 13:02:09 +0000";
name = "Mineral water";
password = "PW_1";
status = 1;
updatedAt = "2021-01-24 13:32:14 +0000";
})]
viewContext: [<ShopEasy.Item: 0x600000d75ae0> (entity: Item; id: 0x9698d776a7665623 <x-coredata://35BF43D6-4CF7-490D-B944-9DDFF2823AA1/Item/p1617>; data: {
buyPlaces = (
"0x9698d776b10e5621 <x-coredata://35BF43D6-4CF7-490D-B944-9DDFF2823AA1/Place/p971>"
);
fixedAtTopAt = nil;
howOftenBought = 1;
lastBoughtDate = "2021-01-24 13:02:09 +0000";
name = "Mineral water";
password = "PW_1";
status = 2;
updatedAt = nil;
})]
Obviously, the object is first correctly saved using the backgroundContext, and should thus be in the persistent store.
It is then fetched back correctly into the backgroundContext.
But after fetching the same object into the viewContext, the two changed attributes, status and updatedAt, have the values as they were before the save.
My questions:
Are my assumptions wrong? Is something wrong with my code?
Later, I want to fetch back this updated object, and my understanding
is that a fetch always returns the content of the persistent store.
The fetch selects the objects to return based on the content of the persistent store, but it does not by default update the in-memory copies of the objects based on the store’s content. There is an option to do this, which in my experience doesn’t work. To update an existing object from the store, you could refresh it or set up merging on your context so that changes to the store are automatically propagated.

runtime error when saving user generated image to core data (Swift5)

I am trying to save a user generated image to core data. If I program the image the code works fine. But when the user selects the image I am getting the error Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value at jx = drawPlace.image!. I just want to fix that and the code will work. It is not having any problems saving into core data just the wrapping.
var jx = UIImage()
var drawPlace = UIImageView()
func save() {
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
let managedContext = appDelegate.persistentContainer.viewContext
let entity = NSEntityDescription.entity(forEntityName: "Item", in: managedContext)!
let item = NSManagedObject(entity: entity, insertInto: managedContext)
jx = drawPlace.image!
if let data = jx.pngData() {
item.setValue(data, forKey: "image")
}

NSFetchedResultsController can't update the tableView swift4

I'm trying to make it work for last couple of days and can't get it working. Its something tiny detail obviously I can't seem to find.
Could you take a look and give me some insights about my code?
I'm trying to update the logView with app savings in the coredata.
Here's the entire code for ViewController and CoreData Handler.
/// fetch controller
lazy var fetchController: NSFetchedResultsController = { () -> NSFetchedResultsController<NSFetchRequestResult> in
let entity = NSEntityDescription.entity(forEntityName: "Logs", in: CoreDataHandler.sharedInstance.backgroundManagedObjectContext)
let fetchRequest = NSFetchRequest<NSFetchRequestResult>()
fetchRequest.entity = entity
let nameDescriptor = NSSortDescriptor(key: "name", ascending: false)
fetchRequest.sortDescriptors = [nameDescriptor]
let fetchedController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: CoreDataHandler.sharedInstance.backgroundManagedObjectContext, sectionNameKeyPath: "duration", cacheName: nil)
fetchedController.delegate = self as? NSFetchedResultsControllerDelegate
return fetchedController
}()
override func viewDidLoad() {
title = "Week Log"
tableView.tableFooterView = UIView(frame: CGRect.zero)
tableView.separatorColor = UIColor.black
tableView.backgroundColor = UIColor.red
refreshView()
loadNormalState()
loadCoreDataEntities()
}
/**
Refresh the view, reload the tableView.
*/
func refreshView() {
loadCoreDataEntities()
tableView.reloadData()
}
/**
Load history entities from core data. (I'm printing on the console and
be able to see the the fetched data but I can't load it to tableView.)
*/
func loadCoreDataEntities() {
do {
try fetchController.performFetch()
} catch {
print("Error occurred while fetching")
}
}
import Foundation
import CoreData
class CoreDataHandler: NSObject {
/**
Creates a singleton object to be used across the whole app easier
- returns: CoreDataHandler
*/
class var sharedInstance: CoreDataHandler {
struct Static {
static var instance: CoreDataHandler = CoreDataHandler()
}
return Static.instance
}
lazy var backgroundManagedObjectContext: NSManagedObjectContext = {
let backgroundManagedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
let coordinator = self.persistentStoreCoordinator
backgroundManagedObjectContext.persistentStoreCoordinator = coordinator
return backgroundManagedObjectContext
}()
lazy var objectModel: NSManagedObjectModel = {
let modelPath = Bundle.main.url(forResource: "Model", withExtension: "momd")
let objectModel = NSManagedObjectModel(contentsOf: modelPath!)
return objectModel!
}()
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
let persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: self.objectModel)
// Get the paths to the SQLite file
let storeURL = self.applicationDocumentsDirectory().appendingPathComponent("Model.sqlite")
// Define the Core Data version migration options
let options = [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true]
// Attempt to load the persistent store
var error: NSError?
var failureReason = "There was an error creating or loading the application's saved data."
do {
try persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: storeURL, options: options)
} 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 persistentStoreCoordinator
}()
func applicationDocumentsDirectory() -> NSURL {
return FileManager.default.urls(for: FileManager.SearchPathDirectory.documentDirectory, in: FileManager.SearchPathDomainMask.userDomainMask).last! as NSURL
}
func saveContext() {
do {
try backgroundManagedObjectContext.save()
} catch {
print("Error while saving the object context")
// Error occured while deleting objects
}
}
You have a data source delegate somewhere. That data source delegate tells the table view how many items there are, and what their contents is. How does it know how many items? That must be stored somewhere.
When the fetch controller is successful, it must modify the data that the data source delegate relies on in some way, and then call reloadData. Are you doing this? Are you doing anything that causes the data source delegate to change the number of items it reports?
And calling loadCoreDataEntities, immediately followed by reloadData, is nonsense. loadCoreDataEntities is asynchronous. By the time you call reloadData, it hasn't loaded any entities yet. realodData is called when loadCoreDataEntities has finished.

Swift SIGBART threat CoreData

I have the problem about SIGBART. i did google it and try to solve it.
but i only have it on one of my buttons.
This is how my tool bar said.
CoreData: error: -addPersistentStoreWithType:SQLite
configuration:(null)
URL:file:///var/mobile/Containers/Data/Application/D223A294-3617-494F-8774-9CA6DCB61C2D/Documents/SingleViewCoreData.sqlite
options:(null) ... returned error Error Domain=NSCocoaErrorDomain
Code=134100 "The managed object model version used to open the
persistent store is incompatible with the one that was used to create
the persistent store." UserInfo={metadata={
NSPersistenceFrameworkVersion = 637;
NSStoreModelVersionHashes = {
Item = ;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "7711BB5D-CAF4-4F2E-9122-AF54B74D3850";
"_NSAutoVacuumLevel" = 2; }, reason=The model used to open the store is incompatible with the one used to create the store} with
userInfo dictionary {
metadata = {
NSPersistenceFrameworkVersion = 637;
NSStoreModelVersionHashes = {
Item = ;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "7711BB5D-CAF4-4F2E-9122-AF54B74D3850";
"_NSAutoVacuumLevel" = 2;
};
reason = "The model used to open the store is incompatible with the one used to create the store"; } 2016-01-07 12:18:39.271
test7[2483:1077844] Unresolved error Error Domain=YOUR_ERROR_DOMAIN
Code=9999 "Failed to initialize the application's saved data"
UserInfo={NSLocalizedDescription=Failed to initialize the
application's saved data, NSLocalizedFailureReason=There was an error
creating or loading the application's saved data.,
NSUnderlyingError=0x134e63a80 {Error Domain=NSCocoaErrorDomain
Code=134100 "The managed object model version used to open the
persistent store is incompatible with the one that was used to create
the persistent store." UserInfo={metadata={
NSPersistenceFrameworkVersion = 637;
NSStoreModelVersionHashes = {
Item = ;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "7711BB5D-CAF4-4F2E-9122-AF54B74D3850";
"_NSAutoVacuumLevel" = 2; }, reason=The model used to open the store is incompatible with the one used to create the store}}},
[NSLocalizedDescription: Failed to initialize the application's saved
data, NSLocalizedFailureReason: There was an error creating or loading
the application's saved data., NSUnderlyingError: Error
Domain=NSCocoaErrorDomain Code=134100 "The managed object model
version used to open the persistent store is incompatible with the one
that was used to create the persistent store." UserInfo={metadata={
NSPersistenceFrameworkVersion = 637;
NSStoreModelVersionHashes = {
Item = ;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "7711BB5D-CAF4-4F2E-9122-AF54B74D3850";
"_NSAutoVacuumLevel" = 2; }, reason=The model used to open the store is incompatible with the one used to create the store}] (lldb)
Code on board:
import UIKit
import CoreData
class RecordTVC: UITableViewController, NSFetchedResultsControllerDelegate {
let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
var frc : NSFetchedResultsController = NSFetchedResultsController()
func fetchRequest() ->NSFetchRequest {
let fetchRequest = NSFetchRequest(entityName: "users")
let sortDescriptior = NSSortDescriptor(key: "name", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptior]
return fetchRequest
}
func getFRC() ->NSFetchedResultsController {
frc = NSFetchedResultsController(fetchRequest: fetchRequest(), managedObjectContext: moc, sectionNameKeyPath: nil, cacheName: nil)
return frc
}
override func viewDidLoad() {
super.viewDidLoad()
frc = getFRC()
frc.delegate = self
do {
try frc.performFetch()
} catch {
print("failed to perform fetch")
return
}
self.tableView.rowHeight = 100
}
override func viewDidAppear(animated: Bool) {
frc = getFRC()
frc.delegate = self
do {
try frc.performFetch()
} catch {
print("failed to appear")
return
}
self.tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
_ = frc.sections?.count
return 0
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
_ = frc.sections?[section].numberOfObjects
return 0
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("reuseIdentifier", forIndexPath: indexPath)
cell.textLabel?.textColor = UIColor.blueColor()
let users = frc.objectAtIndexPath(indexPath) as! Users
cell.textLabel?.text = users.name
let date = users.data
let note = users.note
cell.detailTextLabel!.text = " Date: \(date!) Note: \(note!)"
return cell
}
}
And on the appDelegate:
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
}
func applicationWillResignActive(application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
func applicationDidEnterBackground(application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(application: UIApplication) {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
// Saves changes in the application's managed object context before the application terminates.
self.saveContext()
}
// 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 "mis-dentmate.com.tw.test7" 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("test7", 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()
}
}
}

Resources