How to refresh DetailViewController when MasterViewController is updated - ios

Question

I have an application where the users can update and add tasks. But when the users update the task I need to update the details in the DetailViewController
When the users updates the task and saves the data in MasterViewController saves but the data in DetailViewController stays the same
How can I fix it so that the details get updated as well
The tasks are added and edited using the AddProjectController
I tried the following methods but none if them worked, all caused the the application to crash
let vc = DetailViewController()
let row = vc.view.layoutIfNeeded();
//Second method
let vc = MasterViewController()
vc.performSegue(withIdentifier: "showDetail", sender: vc.self)
The data is set in the DetailViewController using
override func viewDidLoad() {
super.viewDidLoad()
table.delegate = self
table.dataSource = self
lblName.text = detail.name ?? ""
lblCode.text = detail.code ?? ""
}
MasterViewController
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetail" {
if let indexPath = tableView.indexPathForSelectedRow {
let object = fetchedResultsController.object(at: indexPath)
let controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController
controller.details = object;
controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
controller.navigationItem.leftItemsSupplementBackButton = true
detailViewController = controller
}
}
}
EditViewController
func editEvents(_ sender: Any){
let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "Proj")
do {
let test = try context.fetch(fetchRequest)
var objectUpdate = test[0] as! Assesment;
objectUpdate.name = txtname.text ?? ""
objectUpdate.code = txtCode.text ?? "";
do {
try context.save()
}
catch {
print(error)
}
}
catch {
print(error)
}
}
I want to update the details when the editEvent function is finished executing
Is there anyway I can get this to work?

Answer 1

If You are using coreData .. You can implement FRC in details .. so you get refreshed data every time in callback ...
In your MasterViewController define a variable
Here is another workaround
private var controller : DetailViewController? = nil
Then in your Segue method use this controller
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetail" {
if let indexPath = tableView.indexPathForSelectedRow {
let object = fetchedResultsController.object(at: indexPath)
self.controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController // here you set your instence variable controller
controller.details = object;
controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
controller.navigationItem.leftItemsSupplementBackButton = true
detailViewController = controller
}
}
}
func editEvents(_ sender: Any){
let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "Proj")
do {
let test = try context.fetch(fetchRequest)
var objectUpdate = test[0] as! Assesment;
objectUpdate.name = txtname.text ?? ""
objectUpdate.code = txtCode.text ?? "";
do {
try context.save()
if let detailsCotrollerExists = controller {
detailsCotrollerExists.updateDataWithObject(objectUpdate) // function you will write in detail class which takes object and refresh data there .. Either outlets or Table/Collection View reload
}
}
catch {
print(error)
}
}
catch {
print(error)
}
}
Then you write a function in DetailViewController func updateDataWithObject(_ obj: Assesment) function you will write in detail class which takes object and refresh data there .. Either outlets or Table/Collection View reload
Write function in DetailViewController
func updateDataWithObject(_ obj: Assesment) {
// Refresh data
}