ios - WKWebView 未在 swift 4 xcode 10 中初始化

Question

谁能帮我理解为什么我的 webView 没有在这里初始化。我收到以下错误，因为 webView 为 nil。

fatal error :在展开可选值时意外发现 nil

我到底缺少什么？

import UIKit
import WebKit


class MemoriesViewController: UIViewController, WKNavigationDelegate {

    @IBOutlet weak var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear( animated )

        let urlString:String = "https://www.apple.com"
        let url:URL = URL(string: urlString)!
        let urlRequest:URLRequest = URLRequest(url: url)
        webView.load(urlRequest)

    }


    }

}

为了更清楚地了解实际发生错误的屏幕截图:

Answer 1

将 Webkit.Frameworks 添加到链接的框架和库

然后您可以为 WKWebView 添加 Outlet 并使用您的代码

import UIKit
import WebKit

class MyWebViewController: UIViewController {

@IBOutlet weak var myWV: WKWebView!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    let urlString:String = "https://www.apple.com"
    let url:URL = URL(string: urlString)!
    let urlRequest:URLRequest = URLRequest(url: url)
    myWV.load(urlRequest)
}


}