ios - 在 switch case 语句中获取 segue.destination 作为 View Controller

Question

是否有可能以这样的方式编写以下 switch 语句，即“let dentViewController”部分发生在“switch segue.destination”或“case is DamageTypeDentViewController:”行上？

(我觉得我正在对“case is”和“let dentViewController = segue.destination as”做双重工作)

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    switch segue.destination {
    case is DamageTypeDentViewController:
        let dentViewController = segue.destination as? DamageTypeDentViewController
        dentViewController.doSomething()

    default:
        return
    }

}

Answer 1

是的

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    switch segue.destination {
    case let dentViewController as DamageTypeDentViewController:
        dentViewController.doSomething()

    default:
        return
    }
}

---

如果只有一种情况需要检查你可以这样写

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if case let dentViewController as DamageTypeDentViewController = segue.destination {
        dentViewController.doSomething()
    }
}

或者更简单

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if let dentViewController = segue.destination as? DamageTypeDentViewController {
        dentViewController.doSomething()
    }
}