检测用户何时单击UIWebView或WKWebView中加载的Web窗体

Question

I'd like to detect when a user presses a webform button present in an HTML page loaded in an iOS webview (ideally using WKWebView). Is this possible? And if so, how ?

General comment:

I know that WKWebView has some limitations hence if you know a method that works with WKWebView please share it. If you know a method that works with UIWebView please share that as well as I can use it as start to find a solution for my WKWebView based app.

Answer 1

To do so using WKWebView, you need to conform to WKNavigationDelegate , and set the webView's navigationDelegate .

The method you're probably looking for is - webView:decidePolicyForNavigationAction:decisionHandler: , where you can determine whether to allow the link touch or not. You can get the target URL from navigationAction.request.URL .

A quick example:

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    if ([navigationAction.request.URL.relativeString hasPrefix:kLocalContentPrefix])
    {
        // Show some local content

        // Don't let the webview load this URL.
        decisionHandler(WKNavigationActionPolicyCancel);
    }
    else
    {
        // Allow the webview to load this URL.
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

To do this in UIWebView, it's almost the same, except you just conform to -(BOOL)webView:shouldStartLoadWithRequest:navigationType: in UIWebViewDelegate . But I would recommend using Webkit if possible!

Answer 2

有一种解决方法，由shazron在Objective-C的https://github.com/shazron/WKWebViewFIleUrlTest上演示，可以将文件复制到/ tmp / www并从那里加载。