If let statement error - ios

Question

Im trying to build a todo list with coreData, my goal is to have an error pop-up notification if a user tries to just click the "add" button without entering any text in the text-field.
I currently have the pop-up notification working but once i dismiss the notification and then add text into the text-field and click the "add" button the application crashes.
#IBAction func addBtnTaskPressed(_ sender: Any) {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let task = Task(context: context)
//have to add an if let here.
if let text = textField.text, !text.isEmpty{
task.name = textField.text
//save data to coredata
(UIApplication.shared.delegate as! AppDelegate).saveContext()
} else {
let alert = UIAlertController(title: "Error:", message: "Cannot Add Empty Task", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Continue", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}

Answer 1

I think you are not saving coreData properly. Try this (I haven't tested it though)
#IBAction func addBtnTaskPressed(_ sender: Any) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.managedObjectContext
let entity = NSEntityDescription.entity(forEntityName: "Task", in: context)
let task = NSManagedObject(entity: entity!, insertInto: context) as! Task
//have to add an if let here.
if let text = textField.text, !text.isEmpty{
task.name = textField.text
//save data to coredata
do {
try context.save()
print("saved!")
} catch let error as NSError {
print("Could not save \(error), \(error.userInfo)")
}
} else {
let alert = UIAlertController(title: "Error:", message: "Cannot Add Empty Task", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Continue", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}