didFailLoadWithError incorrectly reports no connection - uiwebview

Question

I have an app with a standard view controller with multiple buttons on it. Each button links to a separate view controller with a unique UIWebView. Each UIWebView has didFailLoadWithError implemented and it seems to work fine: when I turn off wifi, and try to load the UIWebView from the main view controller page, I correctly get the error message from didFailLoadWithError. When I turn on wifi and load the UIWebView, it works fine - no error. However, when I click on a link within that UIWebView page, I get the didFailLoadWithError error again. Even more interesting, I clear the error message and the new page still loads from the link I just clicked, so I know the connection is good. Here is my implementation...does anyone know of a way to force didFailLoadWithError to only run once on first load and suppress it from running again once you verify a web connection is good?
#synthesize webView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Network Alert" message:#"No Internet Connection - Please Check Your Network Settings and Try Again" delegate:self cancelButtonTitle:#"Dismiss" otherButtonTitles:nil];
[alert show];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString: #"http://www.site.com/index.html"]]];
[webView addSubview:activity];
timer=[NSTimer scheduledTimerWithTimeInterval:(1.0/2.0)
target:self selector:#selector(loading) userInfo:nil repeats:YES];
}
- (void)loading {
if (!webView.loading)
[activity stopAnimating];
else
[activity startAnimating];
}

Answer 1

I just had this problem. Whats going on, is when you click on a link within the web view, while the page is still loading, you will get error -999. This translates to NSURLErrorCancelled.
You can find out more in the following link. Goto the URL Loading System Error Codes section. https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Miscellaneous/Foundation_Constants/Reference/reference.html
In my code i was telling an alert view to pop up saying the internet connect was lost upon -webView:didFailLoadWithError: being called. I wrapped that code around a condition on the error object. Heres an example.
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
if ([error code] == NSURLErrorNotConnectedToInternet || [error code] == NSURLErrorNetworkConnectionLost) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:#"Check internet connection." delegate:self cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[alert show];
}
}