Wifi unavailable during Network request

Question

I am calling a web service Synchronously using AFNetowrking. For example i am uploading some data to server and while uploading the wifi is out. How would i know that wifi is unavailable and cancel the request?

Answer 1

I don't know that you have used Reachability class or not. But if not used than it is given in below Apple sample code.

Reachability Introduction

Include these class in your project. Now with the help of AppDelegate.m file you can track availability of network.

Add notification observer in didFinishLaunchingWithOptions: method. This will notify on network changes.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{        
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityDidChange:) name:kReachabilityChangedNotification object:nil];
}

The notification method will call when there is any change in host connectivity or network connectivity.

- (void)reachabilityDidChange:(NSNotification *)notification {

    Reachability *reachability = (Reachability *)[notification object];
    NetworkStatus internetStatus = [reachability currentReachabilityStatus];

    switch (internetStatus) {
        case NotReachable: {
            NSLog(@"The internet is down.");
            break;
        }

        case ReachableViaWiFi: {
            NSLog(@"The internet is working via WIFI.");
            break;
        }

        case ReachableViaWWAN: {
            NSLog(@"The internet is working via WWAN.");
            break;
        }
    }

    NetworkStatus hostStatus = [reachability currentReachabilityStatus];

    switch (hostStatus) {
        case NotReachable: {
            NSLog(@"A gateway to the host server is down.");
            break;
        }

        case ReachableViaWiFi: {
            NSLog(@"A gateway to the host server is working via WIFI.");
            break;
        }

        case ReachableViaWWAN: {
            NSLog(@"A gateway to the host server is working via WWAN.");
            break;
        }
    }
}

Cancel NSURLConnection request when you lost connectivity.

To cancel on going request use - (void)cancel; method of NSURLConnection.

Answer 2

What about retrying request until WiFi if alive again?

Try this cocoapod: https://github.com/shaioz/AFNetworking-AutoRetry