ios - 更改选项卡时 Web View 会使选项卡式应用程序崩溃？

Question

我正在尝试创建一个具有三个选项卡的应用程序。我已将 ViewController 全部设置好并正常工作，但是当我尝试在除第一个选项卡之外的任何不同选项卡上运行 Web View 时，它会崩溃并显示如下消息:

2016-10-06 23:17:54.565932 Techaway[6827:2354958] Unknown class ThirdViewController in Interface Builder file.
2016-10-06 23:17:59.520639 Techaway[6827:2354958] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Techaway.SecondViewController 0x100f0bc20> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key Home.'

如果在第一个 ViewController 中它工作得很好，这让我很困惑。

SecondViewController 中的代码示例:

import UIKit

class SecondViewController: UIViewController {

    var url = URL(string: "https://example.com/")!

    @IBOutlet weak var webView: UIWebView!

    @IBAction func home(_ sender: AnyObject) {
        webView.loadRequest(URLRequest(url: url))


}


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    webView.loadRequest(URLRequest(url: url))
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

我只是不明白为什么它在一个地方有效而在另一个地方不起作用!

Answer 1

您的 xib 中的连接可能较差。因此您需要删除storyboard或xib中未引用的IBOutlet表单UIViewController。

有关此内容的更多信息，请参阅以下链接: What does this mean? "'NSUnknownKeyException', reason: … this class is not key value coding-compliant for the key X"