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  • IOS检测网络连接状态(转)

    使用之前请从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

     1 // the network state of the device for Reachability 1.5.
     2 typedef enum {
     3     NotReachable = 0,  //无连接
     4     ReachableViaCarrierDataNetwork, //使用3G/GPRS网络
     5     ReachableViaWiFiNetwork  //使用WiFi网络
     6 } NetworkStatus;
     7 
     8 // the network state of the device for Reachability 2.0.
     9 typedef enum {
    10     NotReachable = 0,  //无连接
    11     ReachableViaWiFi,  //使用3G/GPRS网络
    12     ReachableViaWWAN  //使用WiFi网络
    13 } NetworkStatus;

    比如检测某一特定站点的接续状况,可以使用下面的代码:

     1 Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”];
     2 switch ([r currentReachabilityStatus]) {
     3     case NotReachable:
     4         // 没有网络连接
     5         break;
     6     case ReachableViaWWAN:
     7         // 使用3G网络
     8         break;
     9     case ReachableViaWiFi:
    10         // 使用WiFi网络
    11         break;
    12 }

    检测当前网络环境:

    1 // 是否wifi
    2 + (BOOL) IsEnableWIFI {
    3     return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);
    4 }
    5 
    6 // 是否3G
    7 + (BOOL) IsEnable3G {
    8     return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);
    9 }

    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

     1 // My.AppDelegate.h
     2 
     3 #import "Reachability.h"
     4 
     5 @interface MyAppDelegate : NSObject <UIApplicationDelegate> {
     6     NetworkStatus remoteHostStatus;
     7 }
     8 
     9 @property NetworkStatus remoteHostStatus;
    10 
    11 @end
    12 
    13 // My.AppDelegate.m
    14 
    15 #import "MyAppDelegate.h"
    16 
    17 @implementation MyAppDelegate
    18 
    19 @synthesize remoteHostStatus;
    20 
    21 // 更新网络状态
    22 - (void)updateStatus {
    23     self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus];
    24 }
    25 
    26 // 通知网络状态
    27 - (void)reachabilityChanged:(NSNotification *)note {
    28     [self updateStatus];
    29     if (self.remoteHostStatus == NotReachable) {
    30         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil) message:NSLocalizedString(@"NotReachable", nil)
    31         delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
    32         [alert show];
    33         [alert release];
    34     }
    35 }
    36 
    37 // 程序启动器,启动网络监视
    38 - (void)applicationDidFinishLaunching:(UIApplication *)application {
    39 
    40     // 设置网络检测的站点
    41     [[Reachability sharedReachability] setHostName:@"www.apple.com"];
    42     [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES];
    43     // 设置网络状态变化时的通知函数
    44     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:)
    45                                                  name:@"kNetworkReachabilityChangedNotification" object:nil];
    46     [self updateStatus];
    47 }
    48 
    49 - (void)dealloc {
    50     // 删除通知对象
    51     [[NSNotificationCenter defaultCenter] removeObserver:self];
    52     [window release];
    53     [super dealloc];
    54 }

    Reachability 2.0

     1 // MyAppDelegate.h
     2 
     3 @class Reachability;
     4 
     5 @interface MyAppDelegate : NSObject <UIApplicationDelegate> {
     6     Reachability  *hostReach;
     7 }
     8 
     9 @end
    10 
    11 // MyAppDelegate.m
    12 - (void)reachabilityChanged:(NSNotification *)note {
    13     Reachability* curReach = [note object];
    14     NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
    15     NetworkStatus status = [curReach currentReachabilityStatus];
    16 
    17     if (status == NotReachable) {
    18         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName""
    19                                                         message:@"NotReachable"
    20                                                        delegate:nil
    21                                               cancelButtonTitle:@"YES" otherButtonTitles:nil];
    22         [alert show];
    23         [alert release];
    24     }
    25 }
    26 
    27 - (void)applicationDidFinishLaunching:(UIApplication *)application {
    28     // ...
    29 
    30     // 监测网络情况
    31     [[NSNotificationCenter defaultCenter] addObserver:self
    32                                           selector:@selector(reachabilityChanged:)
    33                                           name: kReachabilityChangedNotification
    34                                           object: nil];
    35     hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain];
    36     [hostReach startNotifer];
    37     // ...
    38 }
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  • 原文地址:https://www.cnblogs.com/ubersexual/p/3422616.html
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