Unable to save values to Core Data - ios

Question

I am trying to store data to Core-Data in AppDelegate itself and then fetch that data from ViewController. For some reason, it is not getting saved in Core-Data. I have tried searching for this issue on the internet but did not get any specific solution. I have pasted the code below -
AppDelegate.swift
func saveContext () {
let context = persistentContainer.viewContext
print(context)
let entity = NSEntityDescription.entity(forEntityName: "Msg", in: context)
print(entity)
let new = NSManagedObject(entity: entity!, insertInto: context)
print(new)
print(getData.alert_message)
new.setValue(getData.alert_message, forKey: "title")
do {
try context.save()
print("save")
print(new.value(forKey: "title"))
} catch {
let nserror = error as NSError
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
Console Output

Answer 1

You can fetch record from the entity by NSFetchRequest
Try with below method, You just need to pass name of the entity as argument of the function.
func getAllRecordFromTableWhere(_ tableName: String) -> [NSManagedObject]? {
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: tableName)
do {
return try managedContext.fetch(fetchRequest)
} catch let error as NSError {
print("Could not fetch. \(error), \(error.userInfo)")
}
return nil
}
and call function like
if let arrayOfData = DBHelper.getAllRecordFromTableWhere("Msg") {
print(arrayOfData)
}

Answer 2

Hear I have Set My Own Solution, Hope This help You
let contex = ((UIApplication.shared.delegate) as! AppDelegate).persistentContainer.viewContext
func SaveData()
{
let entity = NSEntityDescription.insertNewObject(forEntityName: "Employee", into: contex);
entity.setValue(txtname.text, forKey: "empname") // txtname.text is My TexField name
entity.setValue(txtadd.text, forKey: "empadd");
do
{
try contex.save();
}
catch
{
}
}

Answer 3

I think you are not giving values to all attributes of the entity so check that first.
try something like
new.setValue(msgdata, forKey: "msgdata")
//msgdata is what you want to save on Coredata entity
//try something like this

Answer 4

In my case i was trying to update data saved in core data. but every time it was returning the old data ( not the updated version )
Saved successfully message was being printed in console same as yours
Here are some simple steps that finally solved my problem
fetch data with a NSFetchRequest
save data into a temp variable
delete old data from core data
modify data from temp variable
and finally save context
Here is my update data function
func updateUserData(_ userDetails: UserModel) {
let request = UserDetails.fetchRequest() as NSFetchRequest<UserDetails>
do {
let result = try persistentContainer.viewContext.fetch(request)
if let data = result.first?.userData as Data? {
var loginModel = LoginModel(data: data)
loginModel?.user = userDetails
self.clearUserData() //deleting old data
self.userLoginData = loginModel?.jsonData
}
}catch let error as NSError {
debugPrint(error.localizedDescription)
}
}