范围和阵列故障SWIFT

嗨,我正在用Parse开发一个应用程序,当用户创建一个帐户时,有一个UIPickerView,用户可以从中选择不同的字符串。我试图用字符串保存他们的选择。 我已经使用了它,但这节省了一个数字而不是字符串。

let myRank = picker.selectedRowInComponent(0)

当我尝试

let myRank = pickerArray[row]

我收到一个错误,说“使用未解析的标识符”行。 我想这是因为范围,但我不知道如何解决它!

这是我的代码:

let pickerArray: NSArray = ["- Välj din kompetens -", "Assistent", "Instruktör", "Biträdande Kurschef", "Kurschef"]

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerArray.count
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return "\(pickerArray[row])"
}

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
    // selected value in Uipickerview in Swift
    let rank = pickerArray[row]

}

@IBAction func registerButtonPressed(sender: UIButton) {

    let myRank = pickerArray[row]

    var user = PFUser()
    user.username = email
    user.password = password
    user.email = email
    user[PF_USER_RANK] = myRank
    user[PF_USER_EMAILCOPY] = email
    user[PF_USER_FULLNAME] = name
    user.signUpInBackgroundWithBlock { (succeeded: Bool, error: NSError!) -> Void in
        if error == nil {
            PushNotication.parsePushUserAssign()
            ProgressHUD.showSuccess("Succeeded.")
            self.dismissViewControllerAnimated(true, completion: nil)
        } else {
            if let userInfo = error.userInfo {
                ProgressHUD.showError(userInfo["error"] as String)
            }
        }
    }
}