simple alert view for connection check in a web view

问题

dear Stackover community,

Nearly a week I'm struggling around with the fact that I must have a connection check for my web view so I'm surviving the App review process by Apple :-)

I know that I can use the Reachablity sample but for me as a beginner I would say its not smart to deal with such a code.

I found out that it gets a bit simpler with a simple alert and code like this:

    -(void)webview:(UIWebView *)webview didFailLoadWithError:(NSError *)error {

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                message:@"Can't connect. Please check your internet Connection"
                                               delegate:self
                                      cancelButtonTitle:@"OK"
                                      otherButtonTitles:nil];
[alert show]; }

My problem is that I implemented this code into the .m of my Webviewcontroller and connected the delegate to the Filesowner but the App won't be that nice to me to show me the error message :-)

At the moment I'm using Xcode 4.2.1 with ARC enabled and storyboards.

Would anybody please give me a step by step guide how to get this work? Its probably the last code I need for my App.

Thanks in advance

回答1:

The delegate method is:

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

Note it's "-(void)webView" not "-(void)webview". Just capitalize the "v" in "view" and it will work.

To answer your subsequent question:"now when i stop the loading of the page the error message comes too. Is there another tip ?"

As you can see an NSError is passed to your function. That error contains information about the failure. You can see that information by adding: NSLog(@"Epic fail with error:%@",error); ('Epic' added for dramatic effect). When you log that error you will see a code 'property' listed. Through some experimentation you will see that this code property changes based on the type of error. It seems that this code will equal -1009 for a connection error. All of the possible errors are enumerated here under "URL Loading System Error Codes". Best of all since they are defined in an enumeration you don't have to remember much of that. You can just use:

-(void)webView:(UIWebView *)webview didFailLoadWithError:(NSError *)error {
    if (error.code == NSURLErrorNotConnectedToInternet){
        NSLog(@"You are not connected");
    }
}

回答2:

TRY ... UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[error localizedString ] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

来源：https://stackoverflow.com/questions/8493082/simple-alert-view-for-connection-check-in-a-web-view

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iphone

objective-c

ios

xcode

storyboard