对本地文件的引用无效

Question

This view is to display a local html file. When I launch it, the view never displays, the screen just hangs on the calling view. The exception is a nil value for let fileURL = .

import UIKit
import WebKit

class ViewController2: UIViewController, WKNavigationDelegate {
    var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let fileURL = URL(fileURLWithPath: Bundle.main.path(forResource:"about", ofType: "html")!)
        webView.loadFileURL(fileURL, allowingReadAccessTo: fileURL)
    }
}

Answer 1

You don´t need to cast the Bundle.main.path(forResource:"about", ofType: "html") to URL . Do it like this instead:

let fileURL = Bundle.main.url(forResource: "about", withExtension: "html")!
webView.loadFileURL(fileURL, allowingReadAccessTo: fileURL)

Update:
Remember to also add the file in your Project settings > Your project target > Build Phases > Copy bundle resources otherwise it won´t work. When you add the file to your project remeber to:

• Check "copy items if needed"
• Select "create folder references"