webViewDidFinishLoad called multiple times for single loadrequest

Question

I have been using webView delegate successfully from long time. But recently I faced strange issue with this delegate. In my current project I am trying to access my router from webview. I am passing username and password inside URL only. Below is load request code.

[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://uname:password@192.168.1.1"]]];

This calls webView delegate method (webViewDidFinishLoad and webViewDidStartLoad) 5 times. Is it expected? When I pass simple URL like google.com it works as expected. But with username and password why these delegate methods are called 5 times?

If this behaviour is correct then I need to know why it calls 5 times only. The reason is, in my program - I am calling performSegueWithIdentifier in webViewDidFinishLoad method and in present form it calls segue 5 times. For workaround I can maintain count and will call performSegueWithIdentifier on 5th count only.

Thanks

possible duplicate of : http://stackoverflow.com/questions/1842370/uiwebview-didfinishloading-fires-multiple-times — Rajan Balana, Jun 07 '13 at 12:47

score 15 · Accepted Answer · answered Jun 07 '13 at 22:24

15

webViewDidStartLoad/webViewDidFinishLoad are called once per HTML frame. Your content likely has multiple frames in it.

See UIWebViewDelegate docs.

webViewDidStartLoad: Sent after a web view starts loading a frame.

answered Jun 07 '13 at 22:24

TomSwift

39,369
12
121
149

Thanks TomSwift. My web page has 4 frames. Here is more info about html frames - http://www.w3.org/TR/html401/present/frames.html – Ashish Jun 13 '13 at 16:04

score 6 · Answer 2 · edited Dec 14 '15 at 11:45

This Methods works for me... :)

#pragma mark UI Web View Delegate
NSInteger webViewLoads;
//a web view starts loading
- (void)webViewDidStartLoad:(UIWebView *)webView{
    webViewLoads++;
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [SVProgressHUD showWithStatus:@"Loading..." maskType:SVProgressHUDMaskTypeBlack];
}

//web view finishes loading
- (void)webViewDidFinishLoad:(UIWebView *)webView{
    webViewLoads--;
    [self performSelector:@selector(webViewFinishLoadWithCondition) withObject:nil afterDelay:0.5];
}

//web view handling error
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
    webViewLoads--;
        NSLog(@"Web View Did Fail Load With Error : %@",error);
        [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
        [SVProgressHUD dismiss];
}

-(void)webViewFinishLoadWithCondition{
    if(webViewLoads==0){
        [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
        [SVProgressHUD dismiss];
    }
}

This could use some more explanation. How exactly does it solve the problem? — nobody, May 14 '14 at 04:00
It gives the option to only do something at the last -webViewDidFinishLoad: — Steve Waddicor, Dec 14 '15 at 11:06

Saif · Answer 3 · 2016-12-20T07:19:38.923

0

As webViewDidStartLoad/webViewDidFinishLoad are called once per HTML frame, Use an integer to find when the last frame load is finished,

In detail :

Increment the integer in webViewDidStartLoad
Decrement the integer in webViewDidFinishLoad
In webViewDidFinishLoad check when integer is zero, Which means all the frames of web page are loaded, Now call the selector

This is an explanation of @marvin's answer

Best approach:

Check for isLoading in webViewDidFinishLoad and isLoading is false, do what ever u want

-(void)webViewDidFinishLoad:(UIWebView *)webview  
{
   if (!webview.isLoading)
   {
       // webview is done loading content.

       // `performSegueWithIdentifier` / Your code Here

   }
}

edited Dec 20 '16 at 07:19

answered Dec 20 '16 at 07:10

Saif

2,678
2
22
38

1

This doesn't work if there is more than one frame - it suceeds multiple times – RJH Feb 02 '17 at 08:28
please follow the first approach, hope this helps! – Saif Feb 02 '17 at 09:33

webViewDidFinishLoad called multiple times for single loadrequest

3 Answers3