iOS Reachability监控网络使用

//联系人:石虎  QQ: 1224614774 昵称:嗡嘛呢叭咪哄

第一步:     在AppDelegate.h添加头文件"Reachability.h"

第二步:     导入框架SystemConfiguration.frame

第三步:     下面是代码：

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

 {

 //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"] ;

 //开始监听，会启动一个run loop

 [self.hostReach startNotifier];

 }

 -(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:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];

 [alert show];

 [alert release];

 self.isReachable = NO;

 return;

 }

 if (status==kReachableViaWiFi||status==kReachableViaWWAN) {

 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;

 }

 }

 然后在每个页面的viewWillAppear:加上：

 -(void)viewWillAppear:(BOOL)animated

 {

 [super viewWillAppear:YES];

 AppDelegate *appDlg = (AppDelegate *)[[UIApplication sharedApplication] delegate];

 if(appDlg.isReachable)

 {

 NSLog(@"网络已连接");//执行网络正常时的代码

 }

 else

 {

 NSLog(@"网络连接异常");//执行网络异常时的代码

 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接异常" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];

 [alert show];

 [alert release];

 }

 }

 这样就可以检查到在运行程序时网络突然的中断和连接。