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    AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];
    // 当网络状态改变了,就会调用
    [mgr setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusUnknown: // 未知网络
            case AFNetworkReachabilityStatusNotReachable: // 没有网络(断网)
                HMLog(@"没有网络(断网)");
                [MBProgressHUD showError:@"网络异常,请检查网络设置!"];
                break;
                
            case AFNetworkReachabilityStatusReachableViaWWAN: // 手机自带网络
                HMLog(@"手机自带网络");
                break;
                
            case AFNetworkReachabilityStatusReachableViaWiFi: // WIFI
                HMLog(@"WIFI");
                break;
        }
    }];
    // 开始监控
    [mgr startMonitoring]; 
用
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原文地址:http://my.oschina.net/u/2360054/blog/497797