ios 测试网络是否连接

转自：http://blog.csdn.net/lwq421336220/article/details/16982857

- (BOOL) connectedToNetwork

{

//创建零地址，0.0.0.0的地址表示查询本机的网络连接状态

structsockaddr_in zeroAddress;

bzero(&zeroAddress,sizeof(zeroAddress));

zeroAddress.sin_len =sizeof(zeroAddress);

zeroAddress.sin_family =AF_INET;

SCNetworkReachabilityRef defaultRouteReachability =SCNetworkReachabilityCreateWithAddress(NULL, (structsockaddr *)&zeroAddress);

SCNetworkReachabilityFlags flags;

BOOL didRetrieveFlags =SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);

CFRelease(defaultRouteReachability);

if (!didRetrieveFlags)

{

printf("Error. Could not recover network reachability flagsn");

returnNO;

}

BOOL isReachable = ((flags &kSCNetworkFlagsReachable) != 0);

BOOL needsConnection = ((flags &kSCNetworkFlagsConnectionRequired) != 0);

return (isReachable && !needsConnection) ?YES : NO;

}

使用的时候：

if ([selfconnectedToNetwork]) {

}else{

UIAlertView *alert=[[UIAlertViewalloc]initWithTitle:@"提示"
message:@"网络连接失败，请查看网络连接。"
delegate:self cancelButtonTitle:@"我知道了" otherButtonTitles:nil,nil];

[alertshow];

}