Question

当我第一次启动应用程序时，我正在检查互联网连接，但如果我关闭应用程序并打开飞行模式，然后运行应用程序恢复其工作或它应该检查互联网连接，如果我失去我的无线网络它应该说你的互联网连接丢失或类似的东西。有人对此有正确的答案吗？

Answer 1

使用Reachability API。这是我的一个项目的app委托文件中的一些代码。

// ivars
Reachability* hostReach;
Reachability* internetReach;
Reachability* wifiReach;

- (void) reachabilityChanged: (NSNotification* )note {

    Reachability *curReach = (Reachability *)[note object];

    if ([curReach currentReachabilityStatus] == NotReachable) {

        UIAlertView *alert = [[[UIAlertView alloc] init] autorelease];
        alert.title = @"No network connection?";
        alert.message = @"No network connection.";
        alert.delegate = self;
        [alert addButtonWithTitle:@"OK"];
        [alert show];

    } 

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];

    hostReach = [[Reachability reachabilityWithHostName: @"www.test.com"] retain];
    [hostReach startNotifier];

    internetReach = [[Reachability reachabilityForInternetConnection] retain];
    [internetReach startNotifier];

    wifiReach = [[Reachability reachabilityForLocalWiFi] retain];
    [wifiReach startNotifier];

    // controller setup
    viewController = [[CFSplashViewController alloc] init];

    [window addSubview:viewController.view];
    [window makeKeyAndVisible];

    return YES;
}

// and of course, remember to release all those resources..

Iphone Sdk在应用程序中间自动检查互联网连接？

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