Pfthb

I'm working on an app which is date based. I'm trying to get information to pass from one TableViewController to another.

It's a notification based app that reminds the user that something comes out today. So on the date it comes out, I'd like it to come off the release list and go onto the released list (So if something comes out the Nov.8th, on that date it'll be moved to the released list).

I'm having trouble getting it to work. I used the below codes and the date comes and goes without anything happening, it still shows it on the release list.

Below is the code I used on the release list:

let startOfToday = Calendar.current.startOfDay(for: Date()) as NSDate
let predicate = NSPredicate(format: "release_date > %@", startOfToday)
fetchRequest.predicate = predicate 

And here's the code on the released list:

let startOfToday = Calendar.current.startOfDay(for: Date()) as NSDate
let predicate = NSPredicate(format: "release_date < %@", startOfToday)
fetchRequest.predicate = predicate

Here's the code for the FreshReleaseTableViewController:

import UIKit
import CoreData
import UserNotifications

class FreshReleaseTableViewController: UITableViewController
 var freshreleases = [Release_Date]()
 let dateFormatter = DateFormatter()

 override func viewDidLoad() 
 super.viewDidLoad()

 //create a new button
 let button = UIButton.init(type: .custom)
 //set image for button
 button.setImage(UIImage(named: "Mic App Logo.png"), for: UIControlState.normal)

 dateFormatter.dateStyle = .full
 dateFormatter.timeStyle = .none
 

 @objc func editAction() 
 let viewController = AddfreshreleaseViewController()
 navigationController?.present(viewController, animated: true, completion: nil)
 

 override func viewWillAppear(_ animated: Bool) 
 super.viewWillAppear(animated)

 let appDelegate = UIApplication.shared.delegate as! AppDelegate
 let context = appDelegate.persistentContainer.viewContext

 let fetchRequest = Release_Date.fetchRequest() as NSFetchRequest<Release_Date>

 let sortDescriptor1 = NSSortDescriptor(key: "artist", ascending: true)
 let sortDescriptor2 = NSSortDescriptor(key: "album", ascending: true)
 fetchRequest.sortDescriptors = [sortDescriptor1, sortDescriptor2]
 do 
 freshreleases = try context.fetch(fetchRequest)
 catch let error 
 print("Could not fetch because of error: (error).")
 

 let startOfToday = Calendar.current.startOfDay(for: Date()) as NSDate
 let predicate = NSPredicate(format: "release_date > %@", startOfToday)
 fetchRequest.predicate = predicate

 tableView.reloadData()
 

 // MARK: - Table view data source

 override func numberOfSections(in tableView: UITableView) -> Int 
 return 1
 

 override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return freshreleases.count
 

 override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 

 let cell = tableView.dequeueReusableCell(withIdentifier: "FreshReleaseCellIdentifier", for: indexPath)

 let freshrelease = freshreleases[indexPath.row]

 cell.textLabel?.numberOfLines = 0

 let artist = freshrelease.artist ?? ""
 let album = freshrelease.album ?? ""
 cell.textLabel?.text = artist + "'snnew album '" + album + "'nreleases"

 if let date = freshrelease.release_date as Date? 
 cell.detailTextLabel?.text = dateFormatter.string(from: date)
 else 
 cell.detailTextLabel?.text = ""
 

 return cell
 

 override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool 
 return true
 

 // Override to support editing the table view.
 override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) 
 if freshreleases.count > indexPath.row 
 let freshrelease = freshreleases[indexPath.row]

 // Remove notification
 if let identifier = freshrelease.release_dateId 
 let center = UNUserNotificationCenter.current()
 center.removePendingNotificationRequests(withIdentifiers: [identifier])
 

 let appDelegate = UIApplication.shared.delegate as! AppDelegate
 let context = appDelegate.persistentContainer.viewContext
 context.delete(freshrelease)
 freshreleases.remove(at: indexPath.row)
 do 
 try context.save()
 catch let error 
 print("Could not save (error)")
 
 tableView.deleteRows(at: [indexPath], with: .fade)
 
 

 @available(iOS 11.0, *)

 override func tableView(_ tableView: UITableView,
 leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration?

 
 let modifyAction = UIContextualAction(style: .normal, title: "Edit", handler: (ac:UIContextualAction, view:UIView, success:(Bool) -> Void) in
 print("Update action ...")
 let MainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
 let vc : UIViewController = MainStoryboard.instantiateViewController(withIdentifier: "FreshReleaseEdit") as UIViewController
 self.present(vc, animated: true, completion: nil)
 success(true)

 )
 modifyAction.title = "Edit"
 modifyAction.backgroundColor = .blue

 return UISwipeActionsConfiguration(actions: [modifyAction])
 

 override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool 
 return true
 

And here's the code for the ReleasedTableViewController:

import UIKit
import CoreData
import UserNotifications

class ReleasedTableViewController: UITableViewController
 var freshreleases = [Release_Date]()
 let dateFormatter = DateFormatter()

 override func viewDidLoad() 
 super.viewDidLoad()

 //create a new button
 let button = UIButton.init(type: .custom)
 //set image for button
 button.setImage(UIImage(named: "Mic App Logo.png"), for: UIControlState.normal)

 dateFormatter.dateStyle = .full
 dateFormatter.timeStyle = .none
 

 override func viewWillAppear(_ animated: Bool) 
 super.viewWillAppear(animated)

 let appDelegate = UIApplication.shared.delegate as! AppDelegate
 let context = appDelegate.persistentContainer.viewContext

 let fetchRequest = Release_Date.fetchRequest() as NSFetchRequest<Release_Date>

 let sortDescriptor1 = NSSortDescriptor(key: "album", ascending: true)
 let sortDescriptor2 = NSSortDescriptor(key: "artist", ascending: true)
 fetchRequest.sortDescriptors = [sortDescriptor1, sortDescriptor2]
 do 
 freshreleases = try context.fetch(fetchRequest)
 catch let error 
 print("Could not fetch because of error: (error).")
 

 let startOfToday = Calendar.current.startOfDay(for: Date()) as NSDate
 let predicate = NSPredicate(format: "release_date < %@", startOfToday)
 fetchRequest.predicate = predicate

 tableView.reloadData()
 

 override func numberOfSections(in tableView: UITableView) -> Int 
 return 1
 

 override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return freshreleases.count
 

 override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 

 let cell = tableView.dequeueReusableCell(withIdentifier: "FreshReleaseCellIdentifier", for: indexPath)

 let freshrelease = freshreleases[indexPath.row]

 cell.textLabel?.numberOfLines = 0

 let artist = freshrelease.artist ?? ""
 let album = freshrelease.album ?? ""
 cell.textLabel?.text = artist + "'s nnew album '" + album + "'nreleases"

 if let date = freshrelease.release_date as Date? 
 cell.detailTextLabel?.text = dateFormatter.string(from: date)
 else 
 cell.detailTextLabel?.text = ""
 

 return cell
 

 override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool 
 return true
 

 override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) 
 if freshreleases.count > indexPath.row 
 let freshrelease = freshreleases[indexPath.row]

 // Remove notification
 if let identifier = freshrelease.release_dateId 
 let center = UNUserNotificationCenter.current()
 center.removePendingNotificationRequests(withIdentifiers: [identifier])
 

 let appDelegate = UIApplication.shared.delegate as! AppDelegate
 let context = appDelegate.persistentContainer.viewContext
 context.delete(freshrelease)
 freshreleases.remove(at: indexPath.row)
 do 
 try context.save()
 catch let error 
 print("Could not save (error)")
 
 tableView.deleteRows(at: [indexPath], with: .fade)

 
 

 @available(iOS 11.0, *)
 override func tableView(_ tableView: UITableView,
 leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration?

 
 let modifyAction = UIContextualAction(style: .normal, title: "Update", handler: (ac:UIContextualAction, view:UIView, success:(Bool) -> Void) in
 print("Update action ...")
 success(true)
 )
 modifyAction.title = "Edit"
 modifyAction.backgroundColor = .blue

 return UISwipeActionsConfiguration(actions: [modifyAction])
 

 override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool 
 return true
 

There are a number of potential solutions to this.

The easiest I would propose is that your view controllers listen out for UIApplicationDidBecomeActiveNotification. When this notification fires then you can run rebuild your fetch request and execute it again. This should then give you the up-to-date variation of the list.

An alternative option is to slightly change your data model to include an isReleased flag in your data model. Now in your app delegate you can implement applicationDidBecomeActive. When this method is called you can trigger an update of your database to refresh the isReleased flag. In your view controllers you can make use of NSFetchedResultController and change the predicate of your query to:

 // Unreleased movies
 fetchRequest.predicate = NSPredicate(format: "isReleased = NO")

 // Released movies
 fetchRequest.predicate = NSPredicate(format: "isReleased = YES")

The fetched result controllers have a delegate protocol that lets you listen for changes to your underlying data store, giving you an opportunity to update the UI.