WKWebView函数用于检测URL是否已更改 [英] WKWebView function for detecting if the URL has changed

问题描述

是否有WKWebView类的函数允许您检测WebView的URL何时发生更改？

Is there a function for the WKWebView class that allows you to detect whenever the URL of that WebView has changed?

didCommit 和 didStartProvisionalNavigation 函数似乎并不总是闪现。

The didCommit and didStartProvisionalNavigation functions don't always seem to fire when working with certain elements within the WebView.

编辑：尝试添加通知观察者。以下是我到目前为止：

Attempted adding a Notification observer. Here's what I have thus far:

extension Notification.Name {
    static let checkURL = Notification.Name("checkURL")
}

NotificationCenter.default.post(name: .checkURL, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(getter: webView.url), name: .checkURL, object: webView.url)

推荐答案

你是什么意思他们似乎并不总是开火？什么样的元素？他们必须让WkWebView工作。

What do you mean they don't always seem to fire? What kind of elements? They have to in order for the WkWebView to work.

您尝试更改URL的第一个迹象是：decisionPolicyForNavigationAction

Your first indication that the URL is trying to change is in: decidePolicyForNavigationAction

- (void) webView: (WKWebView *) webView decidePolicyForNavigationAction: (WKNavigationAction *) navigationAction decisionHandler: (void (^)(WKNavigationActionPolicy)) decisionHandler {
    NSLog(@"%s", __PRETTY_FUNCTION__);
    decisionHandler(WKNavigationActionPolicyAllow); //Always allow
    NSURL *u1 = webView.URL;
    NSURL *u2 = navigationAction.request.URL; //If changing URLs this one will be different
}

当您到达时：didStartProvisionalNavigation它已经改变了。

By the time you get to: didStartProvisionalNavigation It has changed.

- (void) webView: (WKWebView *) webView didStartProvisionalNavigation: (WKNavigation *) navigation {
    NSLog(@"%s", __PRETTY_FUNCTION__);
    NSURL *u1 = webView.URL;  //By this time it's changed
}

你所要做的就是实现这些委托方法（在Swift中）并在你看到它改变时做你想做的事。

All you'd have to do is implement these delegate methods (in Swift) and do what you want when you see it change.

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