Saving and retrieving a bool with UserDefaults

Question

I\'m trying to save a bool value to UserDefaults from a UISwitch, and retrieve it in another view. However, I\'ve tried following multiple tutorials and stack answe

Answer 1

Do it like this.

In your first view controller.

• create an IBoutlet connection to your UISwitch

• And then the action for your UISwitch. so in the end, your first view controller should look like this.

import UIKit

class FirstViewController: UIViewController {


    @IBOutlet weak var myswitch: UISwitch! // Outlet connection to your UISwitch (just control+ drag  it to your controller)




    override func viewDidLoad() {
        super.viewDidLoad()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }

    @IBAction func myswitchAction(_ sender: Any) { // Action for your UISwitch

        var myswitctBool : Bool = false // create a local variable that holds your bool value. assume that in the beginning your switch is offed and the boolean value is `false`

        if myswitch.isOn == true { // when user turn it on then set the value to `true`
            myswitctBool = true
        }
        else { // else set the value to false
            myswitctBool = false
        }


        // finally set the value to user default like this
        UserDefaults.standard.set(myswitctBool, forKey: "mySwitch")
        //UserDefaults.standard.synchronize() - this is not necessary with iOS 8 and later.


    }

}

End of the first view controller

Now in your second view controller

• you can get the value of userdefault, which you set in first view controller. I put it in the viewdidload method to show you how it works.

import UIKit

class SecondViewController: UIViewController {

        override func viewDidLoad() {
            super.viewDidLoad()


            let myswitchBoolValuefromFirstVc : Bool = UserDefaults.standard.bool(forKey: "mySwitch")// this is how you retrieve the bool value


            // to see the value, just print those with conditions. you can use those for your things.
            if myswitchBoolValuefromFirstVc == true {
                print("true")
            }
            else {
                print("false")
            }


        }

        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()

        }




    }

Hope this will help to you. good luck