无法将“UINavigationController"类型的值转换为“jacrs_ios.TopViewController" [英] Could not cast value of type 'UINavigationController' to 'jacrs_ios.TopViewController'

问题描述

我是 Swift 的新手，我试图根据我遵循的教程制作侧边菜单，但我遇到了这个错误.无法将‘UINavigationController’(0x1026054a8)类型的值转换为‘jacrs_ios.TopViewController’(0x1009ac510)."我注意到这里已经存在相同的问题，但我仍然不明白.如果我做错了什么，我将包括当前的故事板.谢谢.

I'm new to Swift and I was trying to make a side menu base on the tutorial that I was following but I ran across with this error. "Could not cast value of type 'UINavigationController' (0x1026054a8) to 'jacrs_ios.TopViewController' (0x1009ac510)." I noticed that there were same problems already existing here but I still dont understand. I'm gonna included the current storyboard in case I did something wrong. Thanks.

视图控制器错误

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let topViewController = segue.destination as! TopViewController
    topViewController.stringPassed = userName.text!
}

故事板

推荐答案

试试这个

if let navigationController = segue.destination as? UINavigationController
{

 let topViewController = navigationController?.topViewController as! TopViewController
 topViewController.stringPassed = userName.text!

}

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