title: App crashing when adding second stepper
body: <p>I have successfully got a step updating the values of a Text Field and now i am trying to add a second stepper but the app is now crashing.</p>
  
  <pre><code>    @IBOutlet weak var propertyTypeField: UITextField!
  @IBOutlet weak var insuranceTypeField: UITextField!
  @IBOutlet weak var bedroomField: UITextField!
  @IBOutlet weak var bathroomField: UITextField!
  @IBOutlet weak var doYouOwnPropertyField: UITextField!
  
  @IBOutlet weak var propertyYearField: UITextField!
  @IBOutlet weak var bathroomStepper: UIStepper!
  @IBOutlet weak var bedroomStepper: UIStepper!
  
  override func viewDidLoad() {
      super.viewDidLoad()
  
      view.backgroundColor = UIColor(red: 0xE1/255, green: 0xE1/255, blue: 0xE1/255, alpha: 1.0)
  
  
      //Bedroom stepper setup
      bedroomField.text = "\(Int(bedroomStepper.value))"
      bedroomStepper.addTarget(self, action: "stepperValueDidChange:", forControlEvents: .ValueChanged)
  
      //Bathroom stepper setup
      bathroomField.text = "\(Int(bathroomStepper.value))"
      bathroomStepper.addTarget(self, action: "stepperValueDidChange:", forControlEvents: .ValueChanged)
  
      // Do any additional setup after loading the view.
  }
  
  
  
  
  override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
  }
  
  @IBAction func viewTapped(sender : AnyObject) {
  
      propertyTypeField.resignFirstResponder()
      insuranceTypeField.resignFirstResponder()
      bedroomField.resignFirstResponder()
      bathroomField.resignFirstResponder()
      doYouOwnPropertyField.resignFirstResponder()
      propertyYearField.resignFirstResponder()
  
  }
  
  func stepperValueDidChange(stepper: UIStepper) {
  
      let bedroomStepperMapping: [UIStepper: UITextField] = [bedroomStepper: bedroomField]
      if !(bedroomField.text == ""){
      bedroomStepperMapping[stepper]!.text = "\(Int(stepper.value))"}
  
      let bathroomStepperMapping: [UIStepper: UITextField] = [bathroomStepper: bathroomField]
      if !(bathroomField.text == ""){
      bathroomStepperMapping[stepper]!.text = "\(Int(stepper.value))"}
  }
  </code></pre>
  
  <p>This is the whole code i am using.</p>
  
  <p>The error i am getting is</p>
  
  <blockquote>
    <p>fatal error: unexpectedly found nil while unwrapping an Optional value</p>
  </blockquote>
  
  <p>Hope someone can help.</p>
  
  <p>Thanks</p>