iPhone判断是否接入网络

在这里介绍一种较为简单的判断是否连接网络的方法，首先要引入Reachability.h和.m文件，没有这两个文件的话，google之。然后在***AppDelegate.h中声明如下：

Obj-c代码

 

   
 
  
1.    NetworkStatus remoteHostStatus;   
2.    NetworkStatus internetConnectionStatus;   
3.    NetworkStatus localWiFiConnectionStatus;   
4.  
5. ...   
6.  
7. //Network   
8. NetworkStatus remoteHostStatus;   
9. NetworkStatus internetConnectionStatus;   
10. NetworkStatus localWiFiConnectionStatus;   
11. (void) registerNetworkChecking;   
12. (void) updateNetworkStatus;  
 
 
NetworkStatus remoteHostStatus;
        NetworkStatus internetConnectionStatus;
        NetworkStatus localWiFiConnectionStatus;

...

//Network
@property NetworkStatus remoteHostStatus;
@property NetworkStatus internetConnectionStatus;
@property NetworkStatus localWiFiConnectionStatus;
- (void) registerNetworkChecking;
- (void) updateNetworkStatus;
 
 

 然后在.m中实现：
 

    Obj-c代码 
    

 
    
    
  
1. (void) registerNetworkChecking   
2. {   
3.    [[Reachability sharedReachability] setHostName:@"www.baidu.com"];   
4.    [[NSNotificationCenter defaultCenter] addObserver:self   
5.                                             selector:@selector(reachabilityChanged:)   
6.                                                 name:@"kNetworkReachabilityChangedNotification"  
7.                                               object:nil];   
8.    //[self updateNetworkStatus];   
9.       
10. }   
11. mark NetworkStatus Notification   
12. (void)reachabilityChanged:(NSNotification *)note   
13. {   
14.    //NSLog(@"reachabilityChanged");   
15.    [self updateNetworkStatus];   
16. }   
17.  
18. - (void)updateNetworkStatus   
19. {   
20.    // Query the SystemConfiguration framework for the state of the device's network connections.   
21.    self.remoteHostStatus           = [[Reachability sharedReachability] remoteHostStatus];   
22.    self.internetConnectionStatus   = [[Reachability sharedReachability] internetConnectionStatus];   
23.    self.localWiFiConnectionStatus  = [[Reachability sharedReachability] localWiFiConnectionStatus];       
24. }  
 
 
- (void) registerNetworkChecking
{
        [[Reachability sharedReachability] setHostName:@"www.baidu.com"];
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                                                         selector:@selector(reachabilityChanged:)
                                                                                                 name:@"kNetworkReachabilityChangedNotification"
                                                                                           object:nil];
        //[self updateNetworkStatus];
        
}
#pragma mark NetworkStatus Notification
- (void)reachabilityChanged:(NSNotification *)note
{
        //NSLog(@"reachabilityChanged");
    [self updateNetworkStatus];
}

- (void)updateNetworkStatus
{
        // Query the SystemConfiguration framework for the state of the device's network connections.
        self.remoteHostStatus           = [[Reachability sharedReachability] remoteHostStatus];
        self.internetConnectionStatus   = [[Reachability sharedReachability] internetConnectionStatus];
        self.localWiFiConnectionStatus  = [[Reachability sharedReachability] localWiFiConnectionStatus];        
}
 
 

 在需要判断的地方用：
 

    Obj-c代码 
    

 
    
    
  
1. *appDelegate = (***AppDelegate *)[[UIApplication sharedApplication] delegate];   
2. registerNetworkChecking];     
3. (appDelegate.remoteHostStatus == NotReachable)   
4. {   
5.      //未联网   
6. }   
7. else   
8. {   
9.      //联网   
10. }

Obj-c代码