为什么Cucumber JVM在抛出异常时不会失败步骤或步骤定义？(Why Cucumber JVM does not fail step or step definition when an exception is thrown?)

 在MyVC您可以使用一个convenience init方法来初始化let变量。 试试这个，让我知道它是否适合你： 
 
class MyVC: UIViewController {
let viewBasedParam: CustomClass

    convenience init() {
        self.init(nibName:nil, bundle:nil)
        self.viewBasedParam = CustomClass(self.someLabel.text)//else just initialize with empty string here and then assign actual value in viewDidLoad
    }
}

As far as I've discovered the workaround solution may be following:
 
class MyVC: UIViewController {
    @IBOutlet var someLabel: UILabel!
    private var _viewBasedParam: CustomClass? = nil
    var viewBasedParam: CustomClass {
        get { return self._viewBasedParam! } // always unwrap private optional
        set { self._viewBasedParam = newValue }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        self.viewBasedParam = CustomClass(self.someLabel.text)
    }
}