问如何将布尔值链接到UISwitch的开/关状态？

EN

@IBAction func switchValueChanged(sender: UISwitch) {
        if acsessabilitySwitch.on {
//accessibilitySwitch is the UISwitch in question 
            println("It's True!")
            advice.isInProduction = Bool (true) 
// isInProduction is a attribute of a class
        } else {
            println("It's False!")
            advice.isInProduction = Bool (false)
        }

import Foundation
class videoGameModel{
    var price : Double
    var isInProduction : Bool
    var adviceGiven: String?
    init (isInProduction : Bool, price: Double){
        self.price = price
        self.isInProduction = isInProduction
    }
    func giveAdvice (price:Double, isInProduction:Bool)->(adviceGiven:String){
            if price >= 199.99 {
                var adviceGiven = "Nope, that's too expensive!"
                return adviceGiven
            } else if price <= 99.99{
                if isInProduction == true {
                    var adviceGiven = ("Buy it at GameStop!")
                    return adviceGiven
                } else {
                    var adviceGiven = ("Go look online!")
                    return adviceGiven
                }
            } else {
                var adviceGiven = ("Are you sure you put the info in correctly?")
                return adviceGiven
            }
    }
}

import UIKit
import Foundation
class ViewController: UIViewController {
    @IBOutlet var priceTextField: UITextField
    @IBAction func adviceButtonTapped(sender: AnyObject) {
        let adviceOutputed = advice.adviceGiven!
        adviceLabel.text=adviceOutputed
    }
    @IBAction func viewTapped(sender: AnyObject) {
        priceTextField.resignFirstResponder()
    }

     @IBOutlet var acsessabilitySwitch: UISwitch
     @IBOutlet var adviceLabel: UILabel
     @IBAction func switchValueChanged (sender: UISwitch) {
        advice.isInProduction = sender.on
        println ("It's " + advice.isInProduction.description + "!")
    }
    var advice = videoGameModel (isInProduction: true,price: 0.00)
    func refreshUI(){
        priceTextField.text = String(advice.price)
        adviceLabel.text = ""
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        refreshUI()
    }

    override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
    }


}