IT工程師數位筆記本

類似于一個網絡狀況的探針。
　　[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];
    
    hostReach = [[Reachability reachabilityWithHostName: @"hubj.cnblogs.com"] retain];
    [hostReach startNotifier];
    
    wifiReach=[[Reachability reachabilityForLocalWiFi]retain];
    [wifiReach startNotifier];
 
- (void)reachabilityChanged: (NSNotification* )note {
    Reachability* curReach = [note object];
    NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
    
    NetworkStatus netStatus = [curReach currentReachabilityStatus];
    
    switch (netStatus)
    {
        case NotReachable:
        {
            NSLog(@"Access Not Available");
            break;
        }
            
        case ReachableViaWWAN:
        {
            NSLog(@"Reachable WWAN");
            break;
        }
        case ReachableViaWiFi:
        {
            NSLog(@"Reachable WiFi");
            break;
        }
    }

}
 
判斷網絡是否連接
/***
* 此函數用來判斷是否網絡連接服務器正常
* 需要導入Reachability類
*/
+ (BOOL)isExistenceNetwork
{
    BOOL isExistenceNetwork;
    Reachability *reachability = [Reachability reachabilityWithHostName:@""];  // 測試服務器狀態
    
     switch([reachability currentReachabilityStatus]) {
            case NotReachable:
                  isExistenceNetwork = FALSE;
                  break;
             case ReachableViaWWAN:
                   isExistenceNetwork = TRUE;
                   break;
              case ReachableViaWiFi:
                    isExistenceNetwork = TRUE;
                    break;
     }
     return  isExistenceNetwork;
}
 
實時通知網絡狀況
/*
* 在應用委托的方法didFinishLaunchingWithOptions中添加
*/

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
reachability = [[Reachability reachabilityWithHostName:@"www.baidu.com"] retain];
[reachability startNotifier];
........
return YES;

/**
*此函數通過判斷聯網方式，通知給用戶
*/
- (void)reachabilityChanged:(NSNotification *)notification
{
      Reachability *curReachability = [notification object];
      NSParameterAssert([curReachability isKindOfClass:[Reachability class]]);
      NetworkStatus curStatus = [curReachability currentReachabilityStatus];
      if(curStatus == NotReachable) {
          [DOIN_Util logFax:@"連接失敗"];
      }
}