iOS UIWebView crash in “WebThread”

Question

Anyone able to help me out with this crash? It happens intermittently when switching back and forth between some UIWebView instances while they are loading.

The cra

Answer 1

To expand on @K1w1Geek's answer, the problem may be that the user is closing the web view just before it tries to send a delegate callback and it crashes because it doesn't exist. This doesn't necessarily have to be related to loading a particular document type because I'm experiencing this crash just navigating a Salesforce website.

So if you have a close button, try to stop loading and set the delegate to nil before closing:

- (IBAction)btnCloseWebviewTap:(id)sender{
    [_webView stopLoading];
    _webView.delegate = nil;
    [self dismissViewControllerAnimated:YES completion:nil];
}