ios - 使用从 AppDelegate 传递的参数覆盖 ViewController viewDidLoad 方法参数

Question

在我的 AppDelegate.swift 中，我正在像这样从我的 ViewController.swift 访问和调用方法

let storyboard = UIStoryboard(name: "Main", bundle: nil)
if let controller = storyboard.instantiateViewController(withIdentifier: "ShitstuffController") as? ViewController {
    controller.loadViewIfNeeded();
    controller.viewControllerCustomMethod(); // <-- method from ViewController.swift
}

并且简单调用返回某些东西的方法工作正常，但是，在我的情况下，我需要更改 WKWebView 的请求 url 加载在 viewDidLoad 方法中的内容 ViewController，我正在尝试以这种方式实现它

let storyboard = UIStoryboard(name: "Main", bundle: nil)
if let controller = storyboard.instantiateViewController(withIdentifier: "ShitstuffController") as? ViewController {
    controller.overrideWebViewURL(url: "https://google.com");
    controller.loadViewIfNeeded();
}

overrideWebViewURL 是一个 ViewController 方法，看起来像这样

func overrideWebViewURL(url: String) {
    notificationProvidedLink = url;
    isDidLaunchFromNotification = true;

    print(" ----- Link is set");
}

主要思想是在 AppDelegate 中调用 controller.loadViewIfNeeded(); 之前调用它来覆盖我在 viewDidLoad 中加载的默认 url ViewController，这里是完整的逻辑代码

// AppDelegate.swift
let storyboard = UIStoryboard(name: "Main", bundle: nil)
if let controller = storyboard.instantiateViewController(withIdentifier: "ShitstuffController") as? ViewController {
    controller.overrideWebViewURL(url: link);
    controller.loadViewIfNeeded();
}


//ViewController.swift

var isDidLaunchFromNotification = false
var notificationProvidedLink = "";

func overrideWebViewURL(url: String) {
    notificationProvidedLink = url;
    isDidLaunchFromNotification = true;

    print(" ----- Link is set");
}

override func viewDidLoad() {
    super.viewDidLoad()

    print(" ----- View did load");

    print(isDidLaunchFromNotification);
    print(notificationProvidedLink);

    var url = URL(string: "https://amazon.com");
    if(isDidLaunchFromNotification == true && notificationProvidedLink != "") {
        url = URL(string: notificationProvidedLink);
    }

    var urlRequest = URLRequest(url: url!);

    webView.navigationDelegate = self;
    webView.uiDelegate = self;


    print(urlRequest);

    webView.load(urlRequest);
}

这就是问题所在，尽管我实际上覆盖了请求 url(我可以通过控制台输出看到它)，ViewController 仍然加载我的亚马逊，而不是谷歌。

控制台日志是

 ----- Link is set
 ----- View did load
true
https://google.com
https://google.com

但是为什么？为什么它加载“默认”url？

Answer 1

你不应该那样做。

简单地添加一个属性到你的 View Controller :

var link: String {
    didSet {
        let url = URL(string: link)
        var urlRequest = URLRequest(url: url!)

        webView.navigationDelegate = self
        webView.uiDelegate = self
        webView.load(urlRequest)
    }
}

在你的 appDelegate 中:

let viewController = MyViewController()
viewController.link = "www.mylink.com"