I have managed to make it perform the way I want it by adding
switch.state=1
just before the segue from VC1 to VC2 is performed.
However, I don't think this is the most elegant solution as the button is still nil.
UPDATE:
I have figured out that the issue occurs as when it goes from VC1 to VC2 the VC1 becomes nil, when the VC2 is dismissed it becomes nil as well. Hence the crash. One solution is to use delegates.
VC1:
class FirstViewController: UIViewController,SecondViewControllerProtocol {
@IBOutlet var firstName: UITextField!
@IBOutlet var lastName: UITextField!
@IBOutlet var subscribeSwitch: UISwitch!
@IBAction func goToSecondVC(_ sender: Any) {
let viewController = self.storyboard?.instantiateViewController(withIdentifier: String(describing: SecondViewController.self)) as! SecondViewController
viewController.delegate = self
self.present(viewController, animated: true, completion: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func dismissViewController() {
if let viewController = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController"){
subscribeSwitch.isOn=true
}
}
}
VC2:
protocol SecondViewControllerProtocol {
func dismissViewController()
}
class SecondViewController: UIViewController {
var delegate:SecondViewControllerProtocol!
@IBAction func goBackToFirstVC(_ sender: Any) {
self.dismiss(animated: true) {
self.delegate!.dismissViewController()
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
