Question

如何检查iPhone上是否启用了wifi选项（但可能iPhone未连接到其中一个wifi网络）。

Answer 1

为此，您需要在项目中导入可达性类。

之后： -

#import "Reachability.h"

在你看来DidLoad写道： -

- (void)viewDidLoad {
    Reachability *internetReach = [[Reachability reachabilityForInternetConnection] retain];
    [internetReach startNotifer];
    Reachability *wifiReach = [[Reachability reachabilityForLocalWiFi] retain];
    [wifiReach startNotifer];

    NetworkStatus netStatus1 = [internetReach currentReachabilityStatus];
    NetworkStatus netStatus2 = [wifiReach currentReachabilityStatus];
    if(netStatus1 == NotReachable && netStatus2 == NotReachable)
    {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Sorry" message:@"This feature requires an internet connection." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alertView show];
        [alertView release];
    }
    else
    {//wifi connection available;
}
}

Answer 2

为此找到了很多代码。将Reachability类添加到项目中，然后您可以执行此操作：

BOOL isConnectedProperly = ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] == ReachableViaWiFi);

Answer 3

  First import Reachability files into your project.

 -(void)loginButtonTouched
{  
  bool success = false;
  const char *host_name = [@"www.google.com" 
             cStringUsingEncoding:NSASCIIStringEncoding];

  SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName
                                                (NULL, host_name);
  SCNetworkReachabilityFlags flags;
  success = SCNetworkReachabilityGetFlags(reachability, &flags);
  bool isAvailable = success && (flags & kSCNetworkFlagsReachable) && 
                   !(flags & kSCNetworkFlagsConnectionRequired);

  if (isAvailable) 
  {
      NSLog(@"Host is reachable: %d", flags);
      // Perform Action if Wifi is reachable and Internet Connectivity is present
  }
  else
  {
      NSLog(@"Host is unreachable");
      // Perform Action if Wifi is reachable and Internet Connectivity is not present
  }       
}

调用loginButtonTouched方法后，我们会检查www.google.com是否可以访问。 SCNetworkReachabilityFlags返回标志，帮助我们了解互联网连接的状态。如果isAvailable变量返回“true”，则Host为可访问意味着可以访问Wifi并且存在Internet连接。

如何检查是否启用了wifi选项

3 个答案: