How can I pass multiple pass back multiple variables on View Controller completion without using structs or classes? Here is my code that works:
class TimerViewController: UIViewController {
//DELETED UNIMPORTANT CODE
@IBAction func editTimerButtonPresed(_ sender: UIButton) {
self.performSegue(withIdentifier: "goToEditTimer", sender: self)
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "goToEditTimer" {
let destinationVC = segue.destination as! EditTimerViewController
destinationVC.duration = Int(myTimer.totalTime)
destinationVC.timerName = myTimer.timerName
destinationVC.completion = { [weak self] duration in
DispatchQueue.main.async {
self?.myTimer.totalTime = Double(duration!)
self?.timerLabel.text = String(duration!)
self?.timer.invalidate()
}
}
}
}
}
_
class EditTimerViewController: UIViewController, UITextFieldDelegate {
var duration: Int? //timer duration is passed from Timer
var timerName: String?
public var completion: ((Int?) -> Void)?
//DELETED UNIMPORTANT CODE
@IBAction func savePressed(_ sender: UIButton) {
timerName = timerNameField.text
let timerData = [duration!, timerName] as [Any]
completion?(timerData)
self.dismiss(animated: true, completion: nil)
}
}
but now I want to pass changes made not only to the duration but also to the timerName.
UPDATE
Following @koen advice I tried put both variables in a tuple but I get an error which I can not understand.
Here I declare timerData as a tuple of (Int?, String?) but get en error that expected argument type is Int?:
class EditTimerViewController: UIViewController, UITextFieldDelegate {
var duration: Int? //timer duration is passed from Timer
var timerName: String?
public var completion: ((Int?) -> Void)?
//DELETED UNIMPORTANT CODE
@IBAction func savePressed(_ sender: UIButton) {
timerName = timerNameField.text
var timerData = (duration: duration, name: timerName)
completion?(timerData) //ERROR Cannot convert value of type '(duration: Int?, name: String?)' to expected argument type 'Int?'
self.dismiss(animated: true, completion: nil)
}
}
But I am receiving errors for the following strings:
self?.myTimer.totalTime = Double(timerData[0]!)
self?.timerLabel.text = String(timerData[1]!)
But I am no declaring it at the parent VC:
class TimerViewController: UIViewController {
//DELETED UNIMPORTANT CODE
//timerData was not declared
@IBAction func editTimerButtonPresed(_ sender: UIButton) {
self.performSegue(withIdentifier: "goToEditTimer", sender: self)
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "goToEditTimer" {
let destinationVC = segue.destination as! EditTimerViewController
destinationVC.duration = Int(myTimer.totalTime)
destinationVC.timerName = myTimer.timerName
let timerData = [destinationVC.duration!, destinationVC.timerName!] as [Any]
destinationVC.completion = { [weak self] timerData in //if I check timerData it is described as Declaration let timerData: Int? Declared In TimerViewController.swift
DispatchQueue.main.async {
self?.myTimer.totalTime = Double(timerData.duration) //ERROR Argument passed to call that takes no arguments + ERROR Value of type 'Int?' has no member 'duration'
self?.timerLabel.text = String(timerData.name) //ERROR Argument passed to call that takes no arguments + ERROR Value of type 'Int?' has no member 'duration'
self?.timer.invalidate()
}
}
}
}
}
