WKWebView为什么不打开与target =“ _ blank”的链接？

Question

我的代码有什么问题？为什么WKWebView无法打开target =“ _ blank”的链接？我想使用默认浏览器打开在新标签中打开的链接。如何实现？

import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate {

    @IBOutlet weak var webView: WKWebView!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.
        let url = "https://example.com"
        let request = URLRequest(url: URL(string: url)!)
        self.webView.load(request)
        self.webView.addObserver(self, forKeyPath: #keyPath(WKWebView.isLoading), options: .new, context: nil)

        // Page Scrolling - false or true
        webView.scrollView.isScrollEnabled = false

        // Open new tab links
        webView.uiDelegate = self
        func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
            if let frame = navigationAction.targetFrame,
                frame.isMainFrame {
                return nil
            }
            // for _blank target or non-mainFrame target
            webView.load(navigationAction.request)
            return nil
        }

    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "loading" {
            if webView.isLoading {
                activityIndicator.startAnimating()
                activityIndicator.isHidden = false
            } else {
                activityIndicator.stopAnimating()
                activityIndicator.isHidden = true
            }
        }
    }
}

Answer 1

这是该问题的正确代码

import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate {

    @IBOutlet weak var webView: WKWebView!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        webView.uiDelegate = self
        
        // Do any additional setup after loading the view, typically from a nib.
        let url = "https://example.com"
        let request = URLRequest(url: URL(string: url)!)
        self.webView.load(request)
        self.webView.addObserver(self, forKeyPath: #keyPath(WKWebView.isLoading), options: .new, context: nil)
        
        // Page Scrolling - false or true
        webView.scrollView.isScrollEnabled = false
        
    }
    
    // Open new tab links
    func webView(_ webView: WKWebView,
       createWebViewWith configuration: WKWebViewConfiguration,
       for navigationAction: WKNavigationAction,
       windowFeatures: WKWindowFeatures) -> WKWebView? {
      if navigationAction.targetFrame == nil, let url = navigationAction.request.url, let scheme = url.scheme {
        if ["http", "https", "mailto"].contains(where: { $0.caseInsensitiveCompare(scheme) == .orderedSame }) {
          UIApplication.shared.open(url, options: [:], completionHandler: nil)
        }
      }
      return nil
    }
    
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "loading" {
            if webView.isLoading {
                activityIndicator.startAnimating()
                activityIndicator.isHidden = false
            } else {
                activityIndicator.stopAnimating()
                activityIndicator.isHidden = true
            }
        }
    }
}