objective-c - iOS 开发中 WKWebView 的使用问题拦截跳转

Question

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
   
    请问这里的 webView.URL 和 navigationAction.request.URL 有什么区别？
    
}
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    
    请问这里的 webView.URL 和 navigationAction.request.URL 有什么区别？
}

问题：
1.上面代码块里面的问题 webView.URL 和 navigationAction.request.URL 有什么区别？
2.当我第一次加载一个网页的时候，上面的代理方法为什么会被调用多次？
3.如果我想拦截网页的跳转链接，希望通过 push 打开一个页面重新展示一个 webview，最好是在哪个代理方法里拦截？ 遇到重定向问题怎么破？

Answer 1

Is it because the url is redirected after calling it multiple times?

Answer 2

You can print them out to see their values ​​and see where they are printed when jumping to the web page.
The documentation contains instructions for these two agents.

/*! @abstract Decides whether to allow or cancel a navigation.
 @param webView The web view invoking the delegate method.
 @param navigationAction Descriptive information about the action
 triggering the navigation request.
 @param decisionHandler The decision handler to call to allow or cancel the
 navigation. The argument is one of the constants of the enumerated type WKNavigationActionPolicy.
 @discussion If you do not implement this method, the web view will load the request or, if appropriate, forward it to another application.
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;

/*! @abstract Decides whether to allow or cancel a navigation after its
 response is known.
 @param webView The web view invoking the delegate method.
 @param navigationResponse Descriptive information about the navigation
 response.
 @param decisionHandler The decision handler to call to allow or cancel the
 navigation. The argument is one of the constants of the enumerated type WKNavigationResponsePolicy.
 @discussion If you do not implement this method, the web view will allow the response, if the web view can show it.
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;