How to detect when a UIWebView has completely fini

问题:

I am trying to build a filter for a UIWebView and I am struggiling to detect when the UIWebView has completely finished loading. I have used the following two methods

– webView:shouldStartLoadWithRequest:navigationType:
– webViewDidFinishLoad:

but the issue is that these will be called multiple times when a page has frames and additional content to load.

What I need is to know when the view has completely loaded and there is no more content to fetch. Then when the content has loaded I can check to URL of the page against a list of approved URLS.

ANy ideas?

回答1:

Use the UIWebViewDelegate protocol method webViewDidFinishLoad and webView's isLoading property

 - (void)webViewDidFinishLoad:(UIWebView *)webView
 {
    //Check here if still webview is loding the content
    if (webView.isLoading)
       return;

    //after code when webview finishes
    NSLog(@"Webview loding finished");
 }

回答2:

Swift 3 version:

func webViewDidFinishLoad(_ webView: UIWebView) {
    if webView.isLoading{
        return
    }
    print("Done loading")
}

回答3:

Try use:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)requestURL navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = [requestURL URL];
NSLog(@"##### url = %@",[url absoluteString]); 
return YES;
}

don't forget to set your UIWebView Delegate

or add statement,

NSRange range = [[url absoluteString] rangeOfString:@"https://www.google.com"];
if (range.location != NSNotFound)
{}

hope to help you.

回答4:

It is true that the original question was posted many years ago. Recently I had to find a reliable solution to this issue.

Here is the solution that worked for me:

1. Replaced UIWebView with WKWebWiew.
2. Added 'evaluateJavaScript' code while handling the 'didFinishNavigation' delegate method.

The complete code is:

   - (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation{
    [webView evaluateJavaScript:@"document.body.innerHTML" completionHandler:^(id result, NSError *error) {
        if (result != nil) {
            // Call your method here
        }
        if(error) {
            NSLog(@"evaluateJavaScript error : %@", error.localizedDescription);
        }
    }];
}

回答5:

If you aren't an owner of UIWebView and as a result you don't have an access to webViewDidFinishLoad but you have a reference to UIWebView you can use the next code

Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { (timer) in

    guard uiWebView.isLoading else {
        return
    }

    timer.invalidate()
    //Add your logic here

}