How to determine iFrame finished loading in UIWebView

问题

In my app, I need a way to tell when my webview is finished loading. It is very easy to do that if content is html. However, my content source is javascript with iFrame inside, it will cause UIWebView finishedLoad method called several times. Is there anyway I can check to see if the iframe is finished loading?

回答1:

The only foolproof method I've found is to listen to the three methods that say it's about to start loading, and that it finished loading (plus equivalent for "failed"), and to manually maintain a count for each.

i.e. something like:

int outstandingRequests;

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    outstandingRequests++;
}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    outstandingRequests--;

    if( outstandingRequests < 1 )
    viewLoadingPleaseWait.hidden = TRUE;
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    outstandingRequests--;
}

I've also usually had to overrid the didFail method - Apple incorrectly uses this to report that e.g. the YouTube player has taken over the handling of a YouTube video. It's NOT a fail, it's a "page was loaded by a different application".

e.g.

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    outstandingRequests--;

    if( [error code] == NSURLErrorCancelled )
    {
        NSLog(@"[%@] ...webView CANCELLED loading", [self class] );
    }
    else if( [[error domain] isEqualToString:@"WebKitErrorDomain"]
    && [error code] == 204)
    {
        // no worries ... YouTube, iCal, or etc took over the page load
    }
}

回答2:

(If it is the same domain) you can call a function (in the parent) from the iframe.

top.iFrameLoaded();

回答3:

To tell if a webview is loading, you can use webView.isLoading to check if all the frames of a webview are done loading. No counting the number of iframes necessary. Simply check if isLoading is true inside webViewDidFinishLoad:

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIWebView_Class/Reference/Reference.html

来源：https://stackoverflow.com/questions/2837377/how-to-determine-iframe-finished-loading-in-uiwebview

标签

javascript

iphone

iframe