Xcode12.5和swift 5+如何从WKwebView打开外部Urls链接？

Question

我正在尝试打开与本地html文件的IOS应用程序的外部链接。我正在使用Xcode12.5和swift 5+。我的ViewController中的代码很简单，只需在一个文件夹(www)中打开index.html即可。现在的问题是，我需要在iPhone或iPad的Safari中打开外部链接http或https，而不是在本地应用程序中。我怎么过滤它呢？谢谢你的点子。以下是我到目前为止更新过的代码：

import UIKit
import WebKit
import PDFKit

class ViewController: UIViewController, WKUIDelegate {
    
    var webView: WKWebView!
    
    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView
    
        
    }


    override func viewDidLoad() {
        super.viewDidLoad()
        
        // let myURL = URL(string:"www/index.html")
        // let myRequest = URLRequest(url: myURL!)
        // webView.load(myRequest)
        
    
        let url = Bundle.main.url(forResource: "index", withExtension: "html", subdirectory: "www")!
                
        webView.loadFileURL(url, allowingReadAccessTo: url)
        let request = URLRequest(url: url)
        webView.load(request)
        
    
        
        
    }
    
    // WKWebViewNavigationDelegate
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
             // Check for links.
             if navigationAction.navigationType == .linkActivated {
                 // Make sure the URL is set.
                 guard let url = navigationAction.request.url else {
                     decisionHandler(.allow)
                     return
                 }
     
                 // Check for the scheme component.
                 let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
                 if components?.scheme == "http" || components?.scheme == "https" {
     
                     if navigationAction.targetFrame == nil {
                         UIApplication.shared.open(url)
                         decisionHandler(.cancel)
                     } else {
                         decisionHandler(.allow)
                     }
     
                     // Open the link in the external browser.
                     UIApplication.shared.open(url)
                     // Cancel the decisionHandler because we managed the navigationAction.
                     decisionHandler(.cancel)
                 } else {
                     decisionHandler(.allow)
                 }
             
             }
        
    }

Answer 1

显然，您的webView(_:decidePolicyFor:decisionHandler:)委托函数永远不会被调用。通过添加断点或打印来检查它。

要解决此问题，只需设置WKWebView的navigationDelegate并符合WKNavigationDelegate

class ViewController: UIViewController, WKUIDelegate, WKNavigationDelegate { // <- conform to WKNavigationDelegate
    
    var webView: WKWebView!
    
    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.navigationDelegate = self // <- set the navigationDelegate property
        webView.uiDelegate = self
        view = webView
    }
}