ios - DestinationViewController Segue 和 UINavigationController swift

Question

所以我有一个像这样的 prepareForSegue 方法:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "fromEventTableToAddEvent" {

        let addEventViewController: AddEventViewController = segue.destinationViewController as! AddEventViewController

        addEventViewController.newTagArray = newTagArray

    }
}

但是，在运行时应用程序崩溃并且日志吐出此消息:

Could not cast value of type 'UINavigationController'

错误出现是因为 addEventController 嵌入在导航 Controller 中，但是我不确定如何设置 segue 以便将 destinationViewController 设置为 NavigationController，但也允许我在 prepareForSegue 方法中传递变量到 addEventController

那么我该如何使用 Swift 来做到这一点呢？

非常感谢您提供的帮助和时间作为回应。很有帮助

Answer 1

您只需要访问导航 Controller 的 topViewController，即 AddEventViewController。这是代码:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "fromEventTableToAddEvent" {

        let nav = segue.destinationViewController as! UINavigationController
        let addEventViewController = nav.topViewController as! AddEventViewController

        addEventViewController.newTagArray = newTagArray

    }
}