ios - 如何在 Swift 中向响应式网站添加后退按钮

Question

我使用 WKWebView 创建了一个小应用程序，它允许用户快速访问响应式网站，登陆页面有一个选项允许用户访问完整的公司网站-网站，一旦网站页面显示，我没有后退按钮选项可以让您返回上一页。我如何快速添加一个后退按钮，用户可以选择让他们返回到原始的响应式网站页面。我是新来的，任何帮助将不胜感激。我包含了我的代码副本 (ViewController.swift)。

       ViewController.swift
       //  wfmApp
       //
       //  Created by Stefan Sanders on 9/13/18.
       //  Copyright © 2018 Stefan Sanders. All rights reserved.
       //

    import UIKit
    import WebKit

    class ViewController: UIViewController {

    @IBOutlet weak var wenView: WKWebView!

    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let URLString = "https://www.wastefreemail.com/app"
        let request = URLRequest(url:URL(string:URLString)!)
        self.wenView.load(request)

        self.wenView.addObserver(self, forKeyPath: #keyPath(WKWebView.isLoading), options: .new, context: nil)
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "loading" {
            if wenView.isLoading {
                activityIndicator.startAnimating()
                activityIndicator.isHidden = false
            } else {
                activityIndicator.stopAnimating()
            }
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

Answer 1

这段代码返回到上一页

import UIKit
import WebKit

class ViewController: UIViewController {

    @IBOutlet weak var wenView: WKWebView!

    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let URLString = "https://www.wastefreemail.com/app"
        let request = URLRequest(url:URL(string:URLString)!)
        self.wenView.load(request)

        self.wenView.addObserver(self, forKeyPath: #keyPath(WKWebView.isLoading), options: .new, context: nil)
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "loading" {
            if wenView.isLoading {
                activityIndicator.startAnimating()
                activityIndicator.isHidden = false
            } else {
                activityIndicator.stopAnimating()
            }
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func goBack(_ sender: Any) {
        wenView.goBack()
    }

}