How to reload background UITableView from Modal View - ios

Question

I am trying to show an information which is in Core Data, on UITableViewCell.
I could get the information, but the information wasn't shown on UITableViewCell.
When I set the information on CoreData, I use Modal View then.
I tried to use UITableView.reload() but I couldn't show the information on UITableViewCell.
Please let me know how to show the information when I back from modal view.
This class is about showing the information on UItableView.
import UIKit
import CoreData
protocol FriendListTableViewDelegate {
func reloadTable()
}
class FriendListViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, FriendListTableViewDelegate{
#IBOutlet weak var friendListTableView: UITableView!
var friends:[FriendBasicInfo] = []
override func viewDidLoad() {
super.viewDidLoad()
getData()
}
// Disable to effect the reload
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
reloadTable()
}
// fetch the information from CoreData
func getData() {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
do {
friends = try context.fetch(FriendBasicInfo.fetchRequest())
} catch {
print("error")
}
}
func reloadTable() {
friendListTableView.reloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return friends.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let friendCell = tableView.dequeueReusableCell(withIdentifier: "FriendListCell") as! FriendListTableViewCell
let friendName = friendCell.viewWithTag(1) as? UILabel
let friendImage = friendCell.viewWithTag(2) as? UIImageView
friendName?.text = friends[indexPath.row].name
friendImage?.image = friends[indexPath.row].photo?.toImage()
return friendCell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 80
}
}
This class is to get the information from CoreData
import UIKit
import XLPagerTabStrip
import Eureka
import CoreData
import ImageRow
class InputFriendInforViewController: FormViewController, IndicatorInfoProvider {
var itemInfo: IndicatorInfo = "Info"
var friendPhoto: UIImage?
var friendName: String = ""
var friendBirthday: Date?
var friendGender: String = ""
var friendListTableViewDelegate: FriendListTableViewDelegate!
override func viewDidLoad() {
super.viewDidLoad()
form +++
Section("Friend Information")
<<< ImageRow(){
$0.title = "Image"
$0.sourceTypes = [.PhotoLibrary, .SavedPhotosAlbum, .Camera]
$0.value = UIImage(named: "noImage")
$0.onChange { [unowned self] row in
self.friendPhoto = row.value!
}
}
<<< TextRow(){ row in
row.title = "Name"
row.placeholder = "Enter Name here"
}.onChange { name in
self.friendName = name.value!
}
<<< DateRow(){ row in
row.title = "Birthday"
row.value = Date(timeIntervalSinceReferenceDate: 0)
}.onChange {date in
self.friendBirthday = date.value!
}
<<< PushRow<String>(){row in
row.title = "Gender"
row.options = ["Male","Female","Other"]
}.onChange {gender in
self.friendGender = gender.value!
}
+++ Section()
<<< ButtonRow() {
$0.title = "SAVE"
}.onCellSelection {_, _ in
self.saveInfo()
}
}
// MARK: - IndicatorInfoProvider
func indicatorInfo(for pagerTabStripController: PagerTabStripViewController) -> IndicatorInfo {
return itemInfo
}
// save friend Info for Core Data
func saveInfo (){
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
let managedContext = appDelegate.persistentContainer.viewContext
let friendEntity = NSEntityDescription.entity(forEntityName: "FriendBasicInfo", in: managedContext)!
let friendInfo = NSManagedObject(entity: friendEntity, insertInto: managedContext)
// make unique user ID
let friendUid = NSUUID().uuidString
// Image Data UIImage to png Data
let pngImage = self.friendPhoto?.toPNGData()
friendInfo.setValue(friendUid, forKey: "userID")
friendInfo.setValue(pngImage, forKey: "photo")
friendInfo.setValue(self.friendName, forKey: "name")
friendInfo.setValue(self.friendBirthday, forKey: "birthday")
friendInfo.setValue(self.friendGender, forKey: "gender")
do {
try managedContext.save()
self.dismiss(animated: true, completion:nil)
} catch let error as NSError {
print("Could not save. \(error), \(error.userInfo)")
}
}
}
This class is about UITableViewCell
import UIKit
class FriendListTableViewCell: UITableViewCell {
#IBOutlet weak var sampleImageView: UIImageView!
#IBOutlet weak var sampleLabel:UILabel!
}
V/r,

Answer 1

As you are using an extra data source array just reloading the table view doesn't consider the new inserted item.
There are a few options
Use NSFetchedResultsController. It updates the UI automatically when the context was saved.
On dismiss insert the new item into the data source array and a new row into the table view.
Observe NSManagedObjectContextDidSaveNotification and insert the item as described in 2.
Refetch the entire data and reload the table view.
The options are in order of efficiency. Version 1 is the most efficient one.
Side note:
viewWithTag is horribly old-fashioned. You got outlets, use them for example
cell.sampleLabel!.text = friends[indexPath.row].name

Answer 2

Your FriendListViewController TableView will reflect any updates to any FriendBasicInfo Entity which was fetched within getData() method. To present a new inserted FriendBasicInfo Entities to the database you have to execute a new fetch with getData() method.
Solution:
func reloadTable() {
getData()
friendListTableView.reloadData()
}
Alternative solution
Advanced monitoring of a fetched entities can be done with NSFetchedResultsController Delegate, this controller will automatically update the FriendListViewController tableview for any updated, inserted or deleted entities.