연결 유형 (3G, Edge, Wifi, GPRS)이 변경되었다는 알림을 수신하는 방법

Question

현재 연결이 3G, Edge 또는 WiFi인지 여부를 확인하고 알림을받을 수 있습니까? 또는 연결이 WiFi인지 여부를 확인하는 방법은 무엇입니까?

Answer 1

당신은 구현 후 애플의 도달 가능성 클래스

http://developer.apple.com/library/ios/#samplecode/Reachability/Listings/Classes_Reachability_h.html

를 사용해야합니다 당신은 대리인이를 사용할 수 있습니다

- (void) configureTextField: (Reachability*) curReach 
{ 
    NetworkStatus netStatus = [curReach currentReachabilityStatus]; 
    BOOL connectionRequired= [curReach connectionRequired]; 
    NSString* statusString= @"non"; 
    switch (netStatus) 
    { 
     case NotReachable: 
     { 
      statusString = @"Access Not Available"; 

      //Minor interface detail- connectionRequired may return yes, even when the host is unreachable. We cover that up here... 
      connectionRequired= NO; 
      break; 
     } 

     case ReachableViaWWAN: 
     { 
      statusString = @"Reachable WWAN"; 


      UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Cellular Data Detected" message:@"You are using Cellular data such as 3G or Edge. Downloading large amount of data may effect your cellular internet package costs. To avoid such extra cost kindly use Wifi." 
                  delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
      [alert show]; 
      [alert release]; 


      break; 
     } 
     case ReachableViaWiFi: 
     { 
      statusString= @"Reachable WiFi"; 

      break; 
     } 
    } 
    if(connectionRequired) 
    { 
     statusString= [NSString stringWithFormat: @"%@, Connection Required", statusString]; 
    } 
    NSLog(@"Network= %@",statusString); 
    if ([statusString isEqualToString:@"Access Not Available"]){ 
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Internet Connection" message:@"It seems you are not connected to the internet, the app will try to load from the last cached data - assuming this data exist." 
                 delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
     [alert show]; 
     [alert release]; 
    } 
    //textField.text= statusString; 
} 


- (void) updateInterfaceWithReachability: (Reachability*) curReach 
{ 
    if(curReach == hostReach) 
    { 
     //[self configureTextField: remoteHostStatusField imageView: remoteHostIcon reachability: curReach]; 
     // NetworkStatus netStatus = [curReach currentReachabilityStatus]; 
     // BOOL connectionRequired= [curReach connectionRequired]; 

     [self configureTextField:curReach]; 

    } 
} 

Answer 2

예, 애플은 그것을 보여주는 예제 프로젝트가 있습니다. Reachability

및 here's 예.