iOS检测网络连接状态

来源：互联网发布：js的ready 编辑：程序博客网时间：2024/06/06 00:44

请从Apple网站下载示例：点此下载
然后将Reachability.h 和 Reachability.m 加到自己的项目中，并引用 SystemConfiguration.framework，就可以使用了。

Reachability 中定义了3种网络状态：

<span style="font-size:14px;">// the network state of the device for Reachability 1.5.typedef enum {     NotReachable = 0, //无连接      ReachableViaCarrierDataNetwork, //使用3G/GPRS网络    ReachableViaWiFiNetwork //使用WiFi网络 } NetworkStatus; // the network state of the device for Reachability 2.0.typedef enum { NotReachable = 0, //无连接     ReachableViaWiFi, //使用3G/GPRS网络     ReachableViaWWAN //使用WiFi网络 } NetworkStatus;</span>

比如检测某一特定站点的接续状况，可以使用下面的代码：

<span style="font-size:14px;">Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”];switch ([r currentReachabilityStatus]) {     case NotReachable: // 没有网络连接    break;    case ReachableViaWWAN: // 使用3G网络     break;    case ReachableViaWiFi: // 使用WiFi网络     break;}</span>

检测当前网络环境：

<span style="font-size:14px;">// 是否wifi + (BOOL) IsEnableWIFI {     return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable); }// 是否3G + (BOOL) IsEnable3G {     return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable); }</span>

连接状态实时通知

网络连接状态的实时检查，通知在网络应用中也是十分必要的。接续状态发生变化时，需要及时地通知用户。由于Reachability1.5版与2.0版有一些变化，这里分开来说明使用方法。

Reachability 1.5

<span style="font-size:14px;">// My.AppDelegate.h #import "Reachability.h" @interface MyAppDelegate : NSObject <UIApplicationDelegate> { NetworkStatus remoteHostStatus;}@property NetworkStatus remoteHostStatus; @end // My.AppDelegate.m #import "MyAppDelegate.h" @implementation MyAppDelegate @synthesize remoteHostStatus; // 更新网络状态- (void)updateStatus { self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus]; } // 通知网络状态 - (void)reachabilityChanged:(NSNotification *)note { [self updateStatus];     if (self.remoteHostStatus == NotReachable) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil) message:NSLocalizedString(@"NotReachable", nil) delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; [alert show]; [alert release]; } } // 程序启动器，启动网络监视- (void)applicationDidFinishLaunching:(UIApplication *)application { // 设置网络检测的站点 [[Reachability sharedReachability] setHostName:@"www.apple.com"]; [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES]; // 设置网络状态变化时的通知函数 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:@"kNetworkReachabilityChangedNotification" object:nil]; [self updateStatus]; } - (void)dealloc { // 删除通知对象 [[NSNotificationCenter defaultCenter] removeObserver:self]; [window release]; [super dealloc];}</span>

Reachability 2.0

<span style="font-size:14px;">// MyAppDelegate.h@class Reachability;@interface MyAppDelegate : NSObject <UIApplicationDelegate> {     Reachability *hostReach;} @end // MyAppDelegate.m - (void)reachabilityChanged:(NSNotification *)note {    Reachability* curReach = [note object];    NSParameterAssert([curReach isKindOfClass: [Reachability class]]);     NetworkStatus status = [curReach currentReachabilityStatus];    if (status == NotReachable) {     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName" message:@"NotReachable" delegate:nil cancelButtonTitle:@"YES" otherButtonTitles:nil];     [alert show];     [alert release];     } } - (void)applicationDidFinishLaunching:(UIApplication *)application {     // ...     // 监测网络情况     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];     hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain];    [hostReach startNotifer];    // ... }</span>

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