I am trying to delete binary data from core data. I am using a var int 'place' to determine what specific item I am trying to delete I am getting a runtime error under helpImage.shareInstance.deleteInfo(info: place) which is below.
Cannot convert value of type 'Int' to expected argument type 'Info'
What can I do to delete the 1st item saved in a core data binary attribute?
import UIKit;import CoreData
class ViewController: UIViewController {
var place = 0
override func viewDidLoad() {
super.viewDidLoad()
let gwen = UIImage(named: "unnamed.jpg")
if let imageData = gwen.self?.pngData() {
helpImage.shareInstance.saveImage(data: imageData)
}
let alz = UIImage(named: "alba.jpeg")
if let imageData = alz.self?.pngData() {
helpImage.shareInstance.saveImage(data: imageData)
}
}
#objc func deleteM(){
helpImage.shareInstance.deleteInfo(info: place)
}
}
class helpImage: UIViewController{
private class func getContext() -> NSManagedObjectContext {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
return appDelegate.persistentContainer.viewContext
}
static let shareInstance = helpImage()
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
func saveImage(data: Data) {
let imageInstance = Info(context: context)
imageInstance.img = data
do {
try context.save()
} catch {
print(error.localizedDescription)
}
}
func deleteInfo(info: Info) {
do {
try context.delete(info)
} catch {
print(error.localizedDescription)
}
}
}
I'm also a newbie in swift and learning so if anyone has feedback, I'm more than happy to implement.
here is stroryBoard: on "Save" button click, we will save images in CoreData and on "Show" button click, we will display a tableView with our images fetched from CoreData
here is coreData: don't forget to check Manual/None in Codegen in coreData Class
then manually add coreData NSManagedObject SubClass files (there will be two files).
To generate the class and properties files initially:
source: https://developer.apple.com/documentation/coredata/modeling_data/generating_code
From the Xcode menu bar, choose Editor > Create NSManagedObject Subclass.
Select your data model, then the appropriate entity, and choose where to save the files. Xcode places both a class and a properties file into your project.
// this is how your "Picture+CoreDataClass.swift" looks like
import Foundation
import CoreData
#objc(Picture)
public class Picture: NSManagedObject {
}
// this how your "Picture+CoreDataProperties.swift" looks like
import Foundation
import CoreData
extension Picture {
#nonobjc public class func fetchRequest() -> NSFetchRequest<Picture> {
return NSFetchRequest<Picture>(entityName: "Picture")
}
#NSManaged public var pic: String?
#NSManaged public var id: Int64
}
extension Picture : Identifiable {
}
I have used below extension to get currentTimeStamp as we will need unique ID for each of our coreData object, we will pass currentTimeStamp as ID to be unique.
// MARK: - Get the Current Local Time and Date Timestamp
source: https://stackoverflow.com/questions/46376823/ios-swift-get-the-current-local-time-and-date-timestamp
extension Date {
static var currentTimeStamp: Int64{
return Int64(Date().timeIntervalSince1970 * 1000)
}
}
I have made CRUD functions in DataBaseHelper.swift file
// this "DataBaseHelper" Class
import Foundation
import UIKit
import CoreData
class DataBaseHelper {
// MARK: - Get Context
class func getContext() -> NSManagedObjectContext{
let appDelegate = UIApplication.shared.delegate as! AppDelegate
return appDelegate.persistentContainer.viewContext
}
static let shareInstance = DataBaseHelper()
let context = getContext()
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Picture")
// MARK: - Save Images
func saveImage(picString: String, id: Int64 = Date.currentTimeStamp) {
// here I have passed id = Date.currentTimeStamp, as we need unique ID for each of our object in coreData and Date.currentTimeStamp will always give unique integer. we will use this ID to update and delete particular object.
let entity = NSEntityDescription.entity(forEntityName: "Picture", in: context)!
let image = NSManagedObject(entity: entity, insertInto: context)
image.setValue(picString, forKey: "pic") // key should be same as the attributes taken in coreData Table.
image.setValue(id, forKey: "id") // key should be same as the attributes taken in coreData Table.
do {
try context.save()
print("Images saved in coreData")
print("imageString: \(picString), id: \(id)") // this will print your entered (saved) object in coreData
} catch let error {
print("Could not save images: \(error.localizedDescription)")
}
}
// MARK: - fetch Images
func fetchImages() -> [Picture] {
var arrImages = [Picture]()
fetchRequest.returnsObjectsAsFaults = false
do {
arrImages = try context.fetch(fetchRequest) as? [Picture] ?? [Picture]()
print("Images while fetching from coreData: \(arrImages)") // this will print all objects saved in coreData in an array form.
} catch let error {
print("Could not fetch images: \(error.localizedDescription)")
}
return arrImages
}
// MARK: - fetch Images by ID
func fetchImagesByID(id: Int64) -> Picture {
fetchRequest.returnsObjectsAsFaults = false
let predicate = NSPredicate(format: "id == \(id)")
fetchRequest.predicate = predicate
let result = try? context.fetch(fetchRequest)
return result?.first as? Picture ?? Picture()
}
// MARK: - Update Image
func updateImage(object: Picture) {
let image = fetchImagesByID(id: object.id) // we will first fetch object by its ID then update it.
image.pic = object.pic
do {
try context.save()
print("Image updated in CoreData")
print("after updating Picture --> \(object)")
} catch let error {
print("Could not update Picture: \(error.localizedDescription)")
}
}
// MARK: - Delete Image
func deleteImage(id: Int64) {
let image = fetchImagesByID(id: id) // we will first fetch object by its ID then delete it.
context.delete(image)
do {
try context.save()
print("Image deleted from CoreData")
} catch let error {
print("Could not delete Image --> \(error.localizedDescription)")
}
}
}
here is our ViewController:
I have added 4 images in Assets folder.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var btnSaveImages: UIButton!
#IBOutlet weak var tableViewPicture: UITableView!
#IBOutlet weak var btnShowImages: UIButton!
var resultImages = [Picture]() // this an an instance of our model class (coreData)
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.title = "CoreData Demo"
setUpTableView()
}
// MARK: - Save Images
func saveImagesInCoreData() {
// I have added 4 images in Assets folder, here we will save 3 images in CoreData
let image1 = "flower1"
let image2 = "flower2"
let image3 = "flower3"
DataBaseHelper.shareInstance.saveImage(picString: image1)
DataBaseHelper.shareInstance.saveImage(picString: image2)
DataBaseHelper.shareInstance.saveImage(picString: image3)
}
// MARK: - Fetch Images
func fetchImagesFromCoreData() {
resultImages = DataBaseHelper.shareInstance.fetchImages() // this will give fetched images
}
// MARK: - Set Up TableView
func setUpTableView () {
tableViewPicture.delegate = self
tableViewPicture.dataSource = self
}
// MARK: - Button Save Images Event
#IBAction func btnSaveImages_Event(_ sender: UIButton) {
saveImagesInCoreData() // save images in CoreData
}
// MARK: - Button Show Images Event
#IBAction func btnShowImages_Event(_ sender: UIButton) {
fetchImagesFromCoreData() // fetch Images from CoreData
self.tableViewPicture.reloadData() // reload tableView
}
}
// MARK: - Extesnion TableViewDelegate and TableViewDataSource
extension ViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return resultImages.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "tableViewCell") ?? UITableViewCell()
cell.imageView?.image = UIImage(named: resultImages[indexPath.row].pic ?? "")
return cell
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let editAction = UITableViewRowAction(style: .default, title: "Edit") { (action, indexPath) in
print("Action Edit")
// here we will edit image of selected row in our tableView, we will update selected row with new image that is "flower4".
let image4 = "flower4"
self.resultImages[indexPath.row].pic = image4
DataBaseHelper.shareInstance.updateImage(object: self.resultImages[indexPath.row]) // update image of selected row in tableView
self.tableViewPicture.reloadData()
}
editAction.backgroundColor = .lightGray
let deleteAction = UITableViewRowAction(style: .destructive, title: "Delete") { (action, indexPath) in
print("Action Delete")
// here we will delete an object of selected row in our tableView.
DataBaseHelper.shareInstance.deleteImage(id: self.resultImages[indexPath.row].id) // delete object of selected row in tableView
self.resultImages.remove(at: indexPath.row) // remove from resultImages array
self.tableViewPicture.reloadData()
}
return [deleteAction, editAction]
}
}
if you have doubt feel free to ask !
I made a like button problem is when the like button is tapped the values update only the first tableview cell even if I clicked the second cell it will update the values of likes in the first tableview cell. The values update properly on firestore for each individual cell but its being loaded wrong
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
motivationThoughts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "DailyThoughtCELL", for: indexPath) as? dailyMotivationTableViewCell
cell!.generateCellsforDailymotivation(_MotivationdataMODEL: self.motivationThoughts[indexPath.row], objectID: self.motivationThoughts[indexPath.row].motiveID)
//cell!.postID = self.motivationThoughts[indexPath.row].motiveID //this works and updates the value
//cell!.generateLikeCell(objectID: self.motivationThoughts[indexPath.row].motiveID)
return cell!
}
func loaddailymotivation() {
FirebaseReferece(.MotivationDAILY).addSnapshotListener { querySnapshot, error in
guard let snapshot = querySnapshot else {
print("Error fetching snapshots: \(error!)")
return
}
snapshot.documentChanges.forEach { diff in
if (diff.type == .added) { // this line means if the chage that happened in the document was equal to added something
let data = diff.document.data()
print("we have\(snapshot.documents.count) documents in this array")
let dailyMotivationID = data["objectID"] as! String
let dailymotivationTitle = data["Motivation title"] as! String //calls the data thats heald inside of motivation title in firebase
let dailyMotivationScripture = data["daily motivation scripture"] as! String //calls the data thats heald inside of Motivation script in firebase
let dailyMotivationNumberOfLikes = data["Number of likes in daily motivation post"]as! Int
let MdataModel = motivationDailyModel(RealMotivationID: dailyMotivationID, RealmotivationTitle: dailymotivationTitle, RealmotivationScrip: dailyMotivationScripture, RealmotivationNumberOfLikes: dailyMotivationNumberOfLikes)
self.motivationThoughts.append(MdataModel)
}
/*
I thinkyou need a method that identifies the item that needs to be modified in the array, and replace/modify it. If you add a new object, you have one more element in your table*/
if (diff.type == .modified) {
print("Modified data: \(diff.document.data())")
let newdata = diff.document.data()
let objectID = newdata["objectID"] as! String // we get the object id of the uodated item
//self.GrabThatDamnstring(grabIt: objectID)
//self.incrementLikes(NewobjectID: objectID) //write a function to grab the string from the certain post and then send it to dailymotivationviewcell into the function increment likes so so it can update the specific objectID
guard let dailymotivationIndex = self.motivationThoughts.firstIndex(where: {_ in objectID == objectID}) else { return }
var dailymotivation = self.motivationThoughts[dailymotivationIndex]
let dailyMotivationNumberOfLikes = newdata["Number of likes in daily motivation post"] as! Int
dailymotivation.motivationNumberOfLikes = dailyMotivationNumberOfLikes
self.motivationThoughts[dailymotivationIndex] = dailymotivation
// here you will receive if any change happens in your data add it to your array as you want
}
DispatchQueue.main.async {
self.tableview.reloadData()
}
}
}
}
this is the uitableview cellcode
import UIKit
import FBSDKLoginKit
import Firebase
import JGProgressHUD
class dailyMotivationTableViewCell: UITableViewCell {
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
//numberOfLikesGenerator()
self.holdView.layer.cornerRadius = 19
self.likedbuttonFIlled.isHidden = true
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
#IBOutlet weak var holdView: UIView!
#IBOutlet weak var likedbuttonFIlled: UIImageView!
#IBOutlet weak var likeSavedButton: UIButton!
#IBOutlet weak var DMtextLabel: UILabel!
#IBOutlet weak var DMtitleLabel: UILabel!
#IBOutlet weak var numberOfLikesLabel: UILabel!
//MARK: VARS/LETS
var postID : String!
var MotivationData : motivationDailyModel!
let hud = JGProgressHUD(style: .light)
//MARK: IBACTIONS
#IBAction func likeButtonTapped(_ sender: Any) {
if (Auth.auth().currentUser != nil || AccessToken.current != nil) {
changeLikeButtonMode()
//update like number and update like number on firebase
}
else{
hud.textLabel.text = "Please Login to Continue!"
hud.show(in: self.contentView)
hud.dismiss(afterDelay: 3.0)
hud.indicatorView = JGProgressHUDErrorIndicatorView()
//no user login so pull up login view
}
//MARK: TODO when this button is tapped ALSO WANT TO STORE THIS SNAPSHOT INTO AN ARRAY THAT WE WILL SHOW IN OUR SAVED VIEW CONTROLLEr
}
//call this function from motivation daily viewcontroller and it will also have the item that was tapped
func incrementLikes(){
//MARK: WE NEED TO FIND OUT HOW WE GET THE UUID FOR THE CERTAIN POS
FirebaseReferece(.MotivationDAILY).document(postID).updateData(["Number of likes in daily motivation post":FieldValue.increment(Int64(1))]) { (error) in
if error != nil {
print(error!.localizedDescription)
} else {
print("successfully incremented data!")
}
}
}
func changeLikeButtonMode(){
// so if likedbutton is tapped and the heart isnt red that means that the tag is = 0 so its gnna show the red heard and then also change the tag to 1 but when it is tapped again its going to change the tag to 0 and removed the red heart
if likeSavedButton.tag == 0 //means its empty
{
incrementLikes()
self.likedbuttonFIlled.isHidden = false
likeSavedButton.tag = 1
}else {
self.likedbuttonFIlled.isHidden = true
likeSavedButton.tag = 0
}
}
//MARK: FUNCTIONS
func generateCellsforDailymotivation(_MotivationdataMODEL : motivationDailyModel,objectID : String!) {
DMtextLabel.text = _MotivationdataMODEL.motivationDailyScripture
DMtitleLabel.text = _MotivationdataMODEL.motivationTitle
numberOfLikesLabel.text = "\(String(_MotivationdataMODEL.motivationNumberOfLikes))"
postID = objectID
}
}
The condition in your guard statement always evaluates to true
guard let dailymotivationIndex = self.motivationThoughts.firstIndex(where: {_ in objectID == objectID}) else { return }
Try this instead
guard let dailymotivationIndex = self.motivationThoughts.firstIndex(where: { $0.RealMotivationID == objectID}) else { return }
Life was fairly easy when I first test-developed a text-based application with NSDocument. Now, I have a lot more complicated document-based desktop application with several custom models other than a string with NSTextView. My subclass of NSDocument is the following.
import Cocoa
class Document: NSDocument {
// MARK: - Variables
var image = NSImage()
var myPasteModels = [PasteModel]()
var myPanModel: PanModel?
var myWinModel: WindowModel?
// MARK: - Initialization
override init() {
super.init()
}
// MARK: - Auto saving
override class var autosavesInPlace: Bool {
return false
}
override func data(ofType typeName: String) throws -> Data {
if let viewController = windowControllers[0].contentViewController as? MainViewController {
if viewController.imageModels.count > 0 {
viewController.saveSubViewPositions()
if let window = viewController.view.window {
var pasteModels = [PasteModel]()
for i in 0..<viewController.imageModels.count {
let imageModel = viewController.imageModels[i]
...
...
}
NSKeyedArchiver.setClassName("ColorModel", for: ColorModel.self)
NSKeyedArchiver.setClassName("TextModel", for: TextModel.self)
NSKeyedArchiver.setClassName("ShapeModel", for: ShapeModel.self)
NSKeyedArchiver.setClassName("ShadeModel", for: ShadeModel.self)
NSKeyedArchiver.setClassName("LineModel", for: LineModel.self)
NSKeyedArchiver.setClassName("GradientModel", for: GradientModel.self)
NSKeyedArchiver.setClassName("ArrowModel", for: ArrowModel.self)
NSKeyedArchiver.setClassName("PasteModel", for: PasteModel.self)
NSKeyedArchiver.setClassName("PanModel", for: PanModel.self)
NSKeyedArchiver.setClassName("WindowModel", for: WindowModel.self)
let panModel = PanModel(frameWidth: viewController.panView.frame.size.width, frameHeight: viewController.panView.frame.size.height)
let winModel = WindowModel(width: window.frame.width, height: window.frame.height)
let dict = ["PasteModel": pasteModels, "PanModel": panModel, "WindowModel": winModel] as [String : Any]
do {
let modelData = try NSKeyedArchiver.archivedData(withRootObject: dict, requiringSecureCoding: false)
return modelData
} catch let error as NSError {
Swift.print("\(error)")
}
}
}
}
throw NSError(domain: NSOSStatusErrorDomain, code: unimpErr, userInfo: nil)
}
override func save(withDelegate delegate: Any?, didSave didSaveSelector: Selector?, contextInfo: UnsafeMutableRawPointer?) {
if let _ = fileURL {
Swift.print("Saved!!!")
} else {
Swift.print("Not saved yet...")
NSApp.sendAction(#selector(NSDocument.saveAs(_:)), to: nil, from: self)
}
}
override func prepareSavePanel(_ savePanel: NSSavePanel) -> Bool {
savePanel.allowedFileTypes = ["fss"]
savePanel.allowsOtherFileTypes = true
savePanel.isExtensionHidden = false
return true
}
}
The problem that I have is that the application never saves a document if I choose Save As under File (or press Command + Shift + S). If I choose Save As, the application goes beep and dismiss the command selection. It does enter the prepareSavePanel method if I set a break point there. So what can I do to go any further? Thanks.
I would like to change an icon of my tabbar from the appDelegate.
I will explain why I want to do that.
From my website I send data by push to my application, so in the appdelegate I recieve the data in the function didReceiveRemoteNotification, with these data I create a local notification manually. I would also like to be able to modify the icon of my TabBar to show that there is a new notification.
So how to change the icon of the tabbar from the app delegate?
Here is a photo of my app, the green circle is the part that means "New notification"
My App images
Here my code in appdelegate:
func application(_ application: UIApplication, didReceiveRemoteNotification data: [AnyHashable: Any]) {
if let data = data as? NSDictionary {
print("Title: \(data)")
LocalNotification.createLocalNotificationWithIntervals(identifier: "Push",
title: data["title"] as! String,
body: data["body"] as! String,
intervals: 1) { error in
guard error == nil else {
print("Error: \(error!.localizedDescription)")
return
}
print("Successfully execute notification")
}
}
}
I user a tabor controller:
class FittoTabBarController: UITabBarController {
let kImageNoLabelInset: CGFloat = 6.0
var selectedTab: FittoTabBar.Tabs = .pods {
didSet {
selectedIndex = selectedTab.rawValue
}
}
override func viewDidLoad() {
super.viewDidLoad()
selectedTab = .pods
removeItemsTitles()
}
override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
guard let selectedItemIndex = tabBar.items?.index(of: item),
let selectedTab = FittoTabBar.Tabs(rawValue: selectedItemIndex) else {
return
}
self.selectedTab = selectedTab
}
private func removeItemsTitles() {
if let items = self.tabBar.items {
for item in items {
item.title = ""
item.imageInsets = UIEdgeInsets(top: kImageNoLabelInset, left: 0.0, bottom: -kImageNoLabelInset, right: 0.0)
}
}
}
The input of my application is on the tabbar controller
With the code provided above, You need to follow these steps to make it working.
In your FittoTabBarController add these methods.
func setBadge(_ value: String?) {
_ = self.viewControllers![2].tabBarItem.badgeValue = value
}
func getBadge() -> String? {
return self.viewControllers![2].tabBarItem.badgeValue
}
func resetBadge() {
self.viewControllers![2].tabBarItem.badgeValue = nil
}
In your appDelegate, get the rootViewController of your window, on receiving notification
func application(_ application: UIApplication, didReceiveRemoteNotification data: [AnyHashable: Any]) {
if let data = data as? NSDictionary {
print("Title: \(data)")
let myTabBarController = self.window?.rootViewController as! FittoTabBarController
var newBadgeCount = "1"
if let currentBadgeCount = myTabBarController.getBadge() {
// Convert to int
var intValOfCurrentBadge = Int(currentBadgeCount)!
// Increaset it by one.
intValOfCurrentBadge = intValOfCurrentBadge + 1
// Convert back to string.
newBadgeCount = "\(intValOfCurrentBadge)"
}
// Set your badge value here.
myTabBarController.setBadge(newBadgeCount)
// ADD YOUR EXISTING CODE HERE
}
}
when user clicks on the 3rd tab, just call the resetBadge() method to remove the badge count.
Hope it helps.
I'm attempting to use a fetchedResultsController to handle the results in my UITable.
It works initially when the program starts up. Then when I switch back to the inventory tab where my table is (for the viewToAppear again), this is when it crashes.
I'm getting a runtime crash error in my viewWillAppear() method of the window which has the table.
In particular it crashes on the Inventory+CoredataProperties.swift file on this line let characters = name!.characters.map { String($0) }, but I suspect the error is somewhere else as this works initially so why not now on the 2nd reload?
Here is the function.
override func viewWillAppear(_ animated: Bool) {
print("view appearing")
//When the view appears its important that the table is updated.
//Trigger Event on SearchBar in case returning from BarCode Scanner
// self.searchBar:SearchBar textDidChange:recentlySearchedWord;
//searchBar.performSelector(":textDidChange")
//Perform another fetch again to get correct data~
do {
//fetchedResultsController. //this will force setter code to run again.
print("attempting fetch again, reset to use lazy init")
fetchedResultsController = setFetchedResultsController() //sets it again so its correct.
try fetchedResultsController.performFetch()
} catch {
print("An error occurred")
}
inventoryTable.reloadData()//this is important to update correctly for changes that might have been made
}
The error occurs on the try fetchedResultsController.performFetch() statement. I'm getting a lot of errors before the actual crash occurs saying "API Misuse: Attempt to serialize store access on non-owning coordinator (PSC = 0x170265300, store PSC = 0x0). I've been refactoring my code to work with the new swift 3 standards I have a feeling I did something wrong or maybe something changed with how the fetched results controller works.
Any help is appreciated as to what could be the cause?
If you think I'm missing a file you need to see, just let me know and I'll add it to the relevant source code below.
POSSIBLE RELEVANT SOURCE CODE BELOW:
InventoryController.swift (Entire File)
import UIKit
import CoreData
import Foundation
class InventoryController: UIViewController, UISearchBarDelegate, UITableViewDataSource, UITableViewDelegate, NSFetchedResultsControllerDelegate {
#available(iOS 2.0, *)
//Create fetchedResultsController to handle Inventory Core Data Operations
lazy var fetchedResultsController: NSFetchedResultsController<Inventory> = {
return self.setFetchedResultsController()
}()
//Reference to search text for filtering
var m_searchText = ""
func setFetchedResultsController() -> NSFetchedResultsController<Inventory>{
let moc = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let inventoryFetchRequest : NSFetchRequest<Inventory> = Inventory.fetchRequest()
var primarySortDescriptor = NSSortDescriptor(key: "name", ascending: true)//by default assume name.
print("primarySortDescriptor...")
if(g_appSettings[0].indextype=="numberfront"){
primarySortDescriptor = NSSortDescriptor(key: "barcode", ascending: true)
}else if(g_appSettings[0].indextype=="numberback"){
primarySortDescriptor = NSSortDescriptor(key: "barcodeReverse", ascending: true)
}else if(g_appSettings[0].indextype=="numberfourth"){
primarySortDescriptor = NSSortDescriptor(key: "barcodeFourth", ascending: true, selector: #selector(NSString.localizedCompare(_:)))
}
print("set primarySortDescriptor")
//let secondarySortDescriptor = NSSortDescriptor(key: "barcode", ascending: true)
inventoryFetchRequest.sortDescriptors = [primarySortDescriptor]
print("set sort descriptors to fetch request")
var storefilter : Store? = nil
var predicate: NSPredicate
//Store should never be set to nil, the first store should always be selected by default. For fringe cases just in case ... support added so doesn't break
if(g_appSettings[0].selectedStore != nil){
storefilter = g_appSettings[0].selectedStore
predicate = NSPredicate(format: "store = %#", storefilter!) //default predicate assuming store is selected
//However if search text is present then modify predicate
if(m_searchText != ""){
predicate = NSPredicate(format: "store = %# AND name contains[cd] %# OR store = %# AND barcode contains[cd] %#", storefilter!,m_searchText,storefilter!,m_searchText)
}
//This will ensure correct data relating to store is showing (and if any filters present, them as well)
inventoryFetchRequest.predicate = predicate
}else{
if(m_searchText != ""){
predicate = NSPredicate(format: "name contains[cd] %# OR barcode contains[cd] %#",m_searchText,m_searchText)
inventoryFetchRequest.predicate = predicate
//This will ensure correct data relating to store is showing
}
}
//default assume letter section
var frc = NSFetchedResultsController(
fetchRequest: inventoryFetchRequest,
managedObjectContext: moc,
sectionNameKeyPath: "lettersection",
cacheName: nil)
if(g_appSettings[0].indextype=="numberfront"){
frc = NSFetchedResultsController(
fetchRequest: inventoryFetchRequest,
managedObjectContext: moc,
sectionNameKeyPath: "numbersection",
cacheName: nil)
}else if(g_appSettings[0].indextype=="numberback"){
frc = NSFetchedResultsController(
fetchRequest: inventoryFetchRequest,
managedObjectContext: moc,
sectionNameKeyPath: "numberendsection",
cacheName: nil)
}else if(g_appSettings[0].indextype=="numberfourth"){
frc = NSFetchedResultsController(
fetchRequest: inventoryFetchRequest,
managedObjectContext: moc,
sectionNameKeyPath: "numberfourthsection",
cacheName: nil)
}
print("set the frc")
frc.delegate = self
return frc
}
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet weak var inventoryTable: UITableView!
// Start DEMO Related Code
var numberIndex = ["0","1","2","3","4","5","6","7","8","9"]
var letterIndex = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]
var previousNumber = -1 //used so we show A,A, B,B, C,C etc for proper testing of sections
func createInventoryDummyData(number: Int) -> Inventory{
let moc = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let tempInventory = NSEntityDescription.insertNewObject(forEntityName: "Inventory", into: moc) as! Inventory
if(number-1 == previousNumber){
tempInventory.name = "\(letterIndex[number-2])-Test Item # \(number)"
previousNumber = -1//reset it again
}else{
tempInventory.name = "\(letterIndex[number-1])-Test Item # \(number)"
previousNumber = number //set previous letter accordingly
}
tempInventory.barcode = "00000\(number+1)00\(number)"
//special exception to demo barcode reader
if(number==5){
tempInventory.barcode = "0051111407592"
}
if(number==6){
tempInventory.barcode = "0036000291452"
}
tempInventory.barcodeReverse = String(tempInventory.barcode!.characters.reversed())
//Convert barcode into array of characters and take note if its size for indexing
let bcArraySize = Int(tempInventory.barcode!.characters.count) - 1//for correct indexing
var bcArray = tempInventory.barcode!.characters.map { String($0) }
print(bcArray)
print(bcArraySize)
//Take the digits from the 4th one at a time and convert to strings concatenating as you go.
let fourth = "\(bcArray[bcArraySize-3])"+"\(bcArray[bcArraySize-2])"+"\(bcArray[bcArraySize-1])"+"\(bcArray[bcArraySize])"
print(fourth)
//Finally convert that into a number again and set to barcodeFourth
tempInventory.barcodeFourth = fourth
print(tempInventory.barcodeFourth!)
//tempInventory.barcodeFourth =
//print(tempInventory.barcodeReverse)
tempInventory.currentCount = 0
tempInventory.id = number as NSNumber?
tempInventory.imageLargePath = "http://distribution.tech//uploads/inventory/7d3fe5bfad38a3545e80c73c1453e380.png"
tempInventory.imageSmallPath = "http://distribution.tech//uploads/inventory/7d3fe5bfad38a3545e80c73c1453e380.png"
tempInventory.addCount = 0
tempInventory.negativeCount = 0
tempInventory.newCount = 0
tempInventory.store_id = 1 //belongs to same store for now
//Select a random store to belong to 0 through 2 since array starts at 0
let lo = 0;
let hi = 2;
let aRandomInt = Int.random(range:lo...hi)
tempInventory.setValue(g_storeList[aRandomInt], forKey: "store") //assigns inventory to one of the stores we created.
return tempInventory
}
func createStoreDummyData(number:Int) -> Store{
let moc = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let tempStore = NSEntityDescription.insertNewObject(forEntityName: "Store", into: moc) as! Store
tempStore.address = "100\(number) lane, Miami, FL"
tempStore.email = "store\(number)#centraltire.com"
tempStore.id = number as NSNumber?
tempStore.lat = 1.00000007
tempStore.lng = 1.00000008
tempStore.name = "Store #\(number)"
tempStore.phone = "123000000\(number)"
return tempStore
}
// End DEMO Related Code
override func viewDidLoad() {
super.viewDidLoad()
let moc = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
print("InventoryController -> ViewDidLoad -> ... starting inits")
// // Do any additional setup after loading the view, typically from a nib.
// print("InventoryController -> ViewDidLoad -> ... starting inits")
//
//First check to see if we have entities already. There MUST be entities, even if its DEMO data.
let inventoryFetchRequest = NSFetchRequest<Inventory>(entityName: "Inventory")
//let storeFetchRequest = NSFetchRequest(entityName: "Store")
do {
let inventoryRecords = try moc.fetch(inventoryFetchRequest)
//Maybe sort descriptor here? But how to organize into sectioned array?
if(inventoryRecords.count<=0){
g_demoMode = true
print("No entities found for inventory. Demo mode = True. Creating default entities & store...")
//Reset the Stores
g_storeList = [Store]()
var store : Store //define variable as Store type
for index in 1...3 {
store = createStoreDummyData(number: index)
g_storeList.append(store)
}
//save changes for inventory we added
do {
try moc.save()
print("saved to entity")
}catch{
fatalError("Failure to save context: \(error)")
}
var entity : Inventory //define variable as Inventory type
for index in 1...52 {
let indexFloat = Float(index/2)+1
let realIndex = Int(round(indexFloat))
entity = createInventoryDummyData(number: realIndex)
g_inventoryItems.append(entity)
}
//Save the changes
(UIApplication.shared.delegate as! AppDelegate).saveContext()
print("finished creating entities")
}
}catch{
fatalError("bad things happened \(error)")
}
// //perform fetch we need to do.
// do {
// try fetchedResultsController.performFetch()
// } catch {
// print("An error occurred")
// }
print("InventoryController -> viewDidload -> ... finished inits!")
}
override func viewWillAppear(_ animated: Bool) {
print("view appearing")
//When the view appears its important that the table is updated.
//Trigger Event on SearchBar in case returning from BarCode Scanner
// self.searchBar:SearchBar textDidChange:recentlySearchedWord;
//searchBar.performSelector(":textDidChange")
//Perform another fetch again to get correct data~
do {
//fetchedResultsController. //this will force setter code to run again.
print("attempting fetch again, reset to use lazy init")
fetchedResultsController = setFetchedResultsController() //sets it again so its correct.
try fetchedResultsController.performFetch()
} catch {
print("An error occurred")
}
inventoryTable.reloadData()//this is important to update correctly for changes that might have been made
}
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
print("inventoryItemControllerPrepareForSegueCalled")
if segue.identifier == "inventoryInfoSegue" {
let vc = segue.destination as! InventoryItemController
vc.hidesBottomBarWhenPushed = true //hide the tab bar. This prevents crashing error from being on this page then syncing & returning.
if let cell = sender as? InventoryTableViewCell{
vc.inventoryItem = cell.inventoryItem //sets the inventory item accordingly, passing its reference along.
}else{
print("sender was something else")
}
}
}
// func tableView(tableView: UITableView, sectionForSectionIndexTitle title: String, atIndex index: Int) -> Int {
// //This scrolls to correct section based on title of what was pressed.
// return letterIndex.indexOf(title)!
// }
func sectionIndexTitles(for tableView: UITableView) -> [String]? {
//This is smart and takes the first letter of known sections to create the Index Titles
return self.fetchedResultsController.sectionIndexTitles
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if let sections = fetchedResultsController.sections {
let currentSection = sections[section]
return currentSection.numberOfObjects
}
return 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "InventoryTableCell", for: indexPath as IndexPath) as! InventoryTableViewCell
print("IndexPath=")
print(indexPath)
let inventory : Inventory = fetchedResultsController.object(at: indexPath as IndexPath)
cell.inventoryItem = inventory
cell.drawCell() //uses passed inventoryItem to draw it's self accordingly.
return cell
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if let sections = fetchedResultsController.sections {
let currentSection = sections[section]
return currentSection.name
}
return nil
}
func numberOfSections(in tableView: UITableView) -> Int {
if let sections = fetchedResultsController.sections {
return sections.count
}
return 0
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
//dispatch_async(dispatch_get_main_queue()) {
//[unowned self] in
print("didSelectRowAtIndexPath")//does not recognize first time pressed item for some reason?
let selectedCell = self.tableView(tableView, cellForRowAt: indexPath) as? InventoryTableViewCell
self.performSegue(withIdentifier: "inventoryInfoSegue", sender: selectedCell)
//}
}
#IBAction func BarcodeScanBarItemAction(sender: UIBarButtonItem) {
print("test of baritem")
}
#IBAction func SetStoreBarItemAction(sender: UIBarButtonItem) {
print("change store interface")
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
self.barcodeTextDidChange(searchText: searchText)
}
func barcodeTextDidChange(searchText: String){
print("text is changing")
//Code to change NSFetchRequest Here~ & Reload Table
m_searchText = searchText //sets the local variable to this class so the setFetchedResultsController() will update accordingly
//Perform another fetch again to get correct data~
do {
//fetchedResultsController. //this will force setter code to run again.
print("attempting fetch again, reset to use lazy init")
fetchedResultsController = setFetchedResultsController() //sets it again so its correct.
try fetchedResultsController.performFetch()
} catch {
print("An error occurred")
}
inventoryTable.reloadData()//refreshes the data~
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
print("ended by cancel")
searchBar.text = ""
m_searchText = "" //set the search text accordingly back to nothing.
//Perform another fetch again to get correct data~
do {
//fetchedResultsController. //this will force setter code to run again.
print("attempting fetch again, reset to use lazy init")
fetchedResultsController = setFetchedResultsController() //sets it again so its correct.
try fetchedResultsController.performFetch()
} catch {
print("An error occurred")
}
inventoryTable.reloadData()//refreshes the data~
searchBar.resignFirstResponder()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
print("ended by search")
searchBar.resignFirstResponder()
}
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
print("ended by end editing")
searchBar.resignFirstResponder()
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
print("DidBeginEditing")
//searchBar.keyboardType = UIKeyboardType.NamePhonePad
}
#IBAction func unwindBackToInventory(segue: UIStoryboardSegue) {
print("unwind attempt")
let barcode = (segue.source as? ScannerViewController)?.barcode
searchBar.text = barcode!
barcodeTextDidChange(searchText: searchBar.text!)//force it to re-run function manually.
print("barcode="+barcode!)
inventoryTable.reloadData()//reload the data to be safe.
}
}
//Extention to INT to create random number in range.
extension Int
{
static func random(range: ClosedRange<Int> ) -> Int
{
var offset = 0
if range.lowerBound < 0 // allow negative ranges
{
offset = abs(range.lowerBound)
}
let mini = UInt32(range.lowerBound + offset)
let maxi = UInt32(range.upperBound + offset)
return Int(mini + arc4random_uniform(maxi - mini)) - offset
}
}
globals.swift
import Foundation
import CoreData
//Array of Inventory & Store Core Data Managed Objects
var g_inventoryItems = [Inventory]()
var g_storeList = [Store]()
var g_appSettings = [AppSettings]()
var g_demoMode = false
Inventory+CoreDataProperties.swift
import Foundation
import CoreData
extension Inventory {
#nonobjc public class func fetchRequest() -> NSFetchRequest<Inventory> {
return NSFetchRequest<Inventory>(entityName: "Inventory");
}
#NSManaged var addCount: NSNumber?
#NSManaged var barcode: String?
#NSManaged var barcodeReverse: String?
#NSManaged var barcodeFourth: String?
#NSManaged var currentCount: NSNumber?
#NSManaged var id: NSNumber?
#NSManaged var imageLargePath: String?
#NSManaged var imageSmallPath: String?
#NSManaged var name: String?
#NSManaged var negativeCount: NSNumber?
#NSManaged var newCount: NSNumber?
#NSManaged var store_id: NSNumber?
#NSManaged var store: Store?
//This is used for A,B,C ordering...
var lettersection: String {
let characters = name!.characters.map { String($0) }
return (characters.first?.uppercased())!
}
//This is used for 1,2,3 ordering... (using front of barcode and using barcodeReverse)
var numbersection: String {
let characters = barcode!.characters.map { String($0) }
return (characters.first?.uppercased())!
}
//This is used for 0000000123 ordering...(uses back number of barcode)
var numberendsection: String {
let characters = barcodeReverse!.characters.map { String($0) }
return (characters.first?.uppercased())!
}
//This is used for 0000000 -> 0123 ordering...(uses back 4th number of barcode)
var numberfourthsection: String {
let characters = barcodeFourth!.characters.map { String($0) }
//print("characters")
//print(characters)
return (characters.first?.uppercased())!
}
}
Inventory.Swift
import Foundation
import CoreData
class Inventory: NSManagedObject {
// Insert code here to add functionality to your managed object subclass
}
Screenshots of Errors
I have reviewed your all comments and contents posted here.
You have not shared one file here, but the problem is occurring you are creating invalid managed objects in the context.
And then whenever you call viewWillAppear() function in InventoryViewController, it saves the context.
Finally, it synced empty records into your database.
During parsing those invalid objects, it tried to parse nil value, so crashed.
Please never set default value for managed objects you are defining as properties.
I hope this will clarify your issue.
I was running into similar issue and i moved to the new CoreData api introduced in ios10.
This uses the NSPersistentContainer class to create the stack and create associated contexts.
This eliminates the need to manually call save or order the creation of fetch results controller.
Good blog post to read: https://useyourloaf.com/blog/easier-core-data-setup-with-persistent-containers/
My setup is a follows
create a store NSPersistentContainer
let persistentContainer = NSPersistentContainer(name: "ModelFileName");
configure settings
let url = NSPersistentContainer.defaultDirectoryURL()
let path = url.appendingPathComponent(persistentContainer.name);
description.shouldAddStoreAsynchronously = true; //write to disk should happen on background thread
self.persistentContainer.persistentStoreDescriptions = [description];
load the store
persistentContainer.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error {
fatalError("Unresolved error \(error), \(error.localizedDescription)")
}
//configure context for main view to automatically merge changes
persistentContainer.viewContext.automaticallyMergesChangesFromParent = true;
});
in the view controller you can access the view context by calling
persistentContainer.viewContext
if you need to make changes you can call
persistentContainer.performBackgroundTask({ (context) in ... });
or you can get a background context
let context = persistentContainer.newBackgroundContext()
context.perform({ ... })
In case this helps anyone else who gets the "API Misuse: Attempt to serialize store access on non-owning coordinator" error - I was getting the error because I accessed an object in a singleton that had not been destroyed and was still using the old NSManagedObjectContext after I reset the NSPersistentStore and NSManagedObjectContext.