Reachability实时网络监听/AFNETWorking2.0+ 网络监听

下载 官方 Reachability demo 导入Reachability.h .m 文件

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

//开启网络状况的监听
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

self.hostReach = [Reachability reachabilityWithHostName:@"www.baidu.com"] ;
[self.hostReach startNotifier];  //开始监听，会启动一个run loop

self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}

//网络链接改变时会调用的方法
-(void)reachabilityChanged:(NSNotification *)note
{
Reachability *currReach = [note object];
NSParameterAssert([currReach isKindOfClass:[Reachability class]]);

//对连接改变做出响应处理动作
NetworkStatus status = [currReach currentReachabilityStatus];
//如果没有连接到网络就弹出提醒实况
self.isReachable = YES;
if(status == NotReachable)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接异常" message:@"暂无法访问书城信息" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];
[alert show];
[alert release];
self.isReachable = NO;
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接信息" message:@"网络连接正常" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];
[alert show];
[alert release];
self.isReachable = YES;
}
}

</pre><pre class="cpp" style="padding: 0px; color: rgb(17, 17, 17); line-height: 23px; font-size: 13px; margin-top: 0px; margin-bottom: 0px; white-space: pre-wrap; -ms-word-wrap: break-word; background-color: rgb(255, 255, 255);" name="code" code_snippet_id="411292" snippet_file_name="blog_20140630_3_6538612">AFNETWorking2.0+ 网络监听