iOS 监控网络状态

苹果官方提供 Reachability 检测网络状态

https://developer.apple.com/library/ios/samplecode/Reachability/Reachability.zip

添加框架SystemConfiguration.framework

 - (void)viewDidLoad
 {
      [super viewDidLoad];
      
      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];}

- (void)dealloc
 {
4      [[NSNotificationCenter defaultCenter] removeObserver:self];
 }

- (void)checkNetworkState
{
     // 1.检测wifi状态
     Reachability *wifi = [Reachability reachabilityForLocalWiFi];
     
     // 2.检测网络(WIFI3G2.5G)
     Reachability *conn = [Reachability reachabilityForInternetConnection];
     
     // 3.判断网络状态
     if ([wifi currentReachabilityStatus] != NotReachable) { // wifi
         12          
     } else if ([conn currentReachabilityStatus] != NotReachable) { // 手机网络
        15          
     } else { // 没有网络
         
         19      }
 }