WKWebView：html 内容中的mailto 链接未打开邮件应用程序

Question

我创建了一个非常简单的 iOS 应用程序 (Swift 5)。它只是WKWebView加载我的 PWA 网址。

除了所有<a href="mailto:name@name.com">Mail me</a>链接外，一切正常。当我点击它们时，没有任何反应，我的邮件应用程序没有打开。

这是我的代码ViewController.swift：

//
//  ViewController.swift
//  panel
//
//  Created by kevin on 25/07/2019.
//  Copyright © 2019 umono. All rights reserved.
//

import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate {
    
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let myURL = URL(string:"https://someUrlToMyApp.appspot.com")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
        
        if #available(iOS 11.0, *) {
            webView.scrollView.contentInsetAdjustmentBehavior = .never;
        }
        
    }
    
    override func loadView() {
        
        let webConfiguration = WKWebViewConfiguration()
        webConfiguration.dataDetectorTypes = [.all]
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView
        
    }

}

编辑：

谢谢伙计，这是我的工作代码：

//
//  ViewController.swift
//  panel
//
//  Created by kevin on 25/07/2019.
//  Copyright © 2019 umono. All rights reserved.
//

import UIKit
import WebKit

class ViewController: UIViewController, WKUIDelegate {
    
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let myURL = URL(string:"https://someUrlToMyApp.appspot.com")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
        
        if #available(iOS 11.0, *) {
            webView.scrollView.contentInsetAdjustmentBehavior = .never;
        }
        
        webView.navigationDelegate = self
        
    }
    
    override func loadView() {
        
        let webConfiguration = WKWebViewConfiguration()
        webConfiguration.dataDetectorTypes = [.all]
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView
        
    }

}

extension ViewController: WKNavigationDelegate {
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction,
                 decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        guard
            let url = navigationAction.request.url else {
                decisionHandler(.cancel)
                return
        }
        
        let string = url.absoluteString
        if (string.contains("mailto:")) {
            UIApplication.shared.open(url, options: [:], completionHandler: nil)
            decisionHandler(.cancel)

            return
        }
        decisionHandler(.allow)
    }
}

Answer 1

做你想做的一种方法是实现 WKNavigationDelegate：

import UIKit
import WebKit

class ViewController: UIViewController {

    @IBOutlet weak var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        guard
            let file = Bundle.main.path(forResource: "test", ofType: "html"),
            let html = try? String(contentsOfFile: file) else {
                return
        }

        webView.navigationDelegate = self
        webView.loadHTMLString(html, baseURL: nil)
    }

    @IBAction func didTapButton(_ sender: Any) {
        let email = "email@email.com"
        guard
            let url = URL(string: "mailto:\(email)") else {
                return
        }

        UIApplication.shared.open(url, options: [:], completionHandler: nil)
    }
}

extension ViewController: WKNavigationDelegate {
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction,
                 decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        guard
            let url = navigationAction.request.url,
            let scheme = url.scheme else {
                decisionHandler(.cancel)
                return
        }

        if (scheme.lowercased() == "mailto") {
            UIApplication.shared.open(url, options: [:], completionHandler: nil)
            // here I decide to .cancel, do as you wish
            decisionHandler(.cancel)
            return
        }
        decisionHandler(.allow)
    }
}

这里你有一个 ViewControllerwebView作为一个插座，这个 WKWebView 会加载一个这样的 html 文件：

<a href="mailto:email@email.com">Mail me</a>

我还在情节提要中添加了一个按钮仅供参考，其中包含上述 IBAction didTapButton。

这里的关键是：

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction,
                 decisionHandler: @escaping (WKNavigationActionPolicy) -> Void)

这将为您提供 URL，并让您决定适合它的策略。在这里，我检查它是否包含，mailto:因为我已经知道这是您感兴趣的内容，所以如果它包含，我只需打开 URL，就像用户按下UIButton屏幕上的可见按钮一样。

希望能帮到你，加油！

LE：确保你在真实设备上运行（模拟器没有安装邮件应用程序），还要确保你安装了邮件应用程序，因为我没有..