Use the Reachability class to determine the current network connection type of the iOS device
- 2020-05-17 06:34:45
- OfStack
(1). Download https: / / developer apple. com library/ios samplecode/Reachability/Reachability zip
(2). Drag reachability.h, reachability.m into the project (not ARC)
ARC:-fno-objc-arc
(3). Import SystemConfiguration.framework
(4) usage
-(NSString*)getNetType
{
NSString* result;
Reachability *r = [Reachability reachabilityWithHostName:@"www.baidu.com"];
NSLog(@" ====:%i",[r currentReachabilityStatus]);
switch ([r currentReachabilityStatus]) {
case NotReachable:// No network connection
result=@" No network connection ";
break;
case ReachableViaWWAN:// use 3G network
result=@"3g";
break;
case ReachableViaWiFi:// use WiFi network
result=@"wifi";
break;
}
NSLog(@"caseReachableViaWWAN=%i",ReachableViaWWAN);
NSLog(@"caseReachableViaWiFi=%i",ReachableViaWiFi);
return result;
}
(5) if it is impossible to distinguish the difference between 2G, 2.5G and 3G networks, then we can reconstruct the networkStatusForFlags method in Reachability. m:
- (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags
{
if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
{
return NotReachable;
}
BOOL retVal = NotReachable;
if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
{
// if target host is reachable and no connection is required
// then we'll assume (for now) that your on Wi-Fi
retVal = ReachableViaWiFi;
}
if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
{
// ... and the connection is on-demand (or on-traffic) if the
// calling application is using the CFSocketStream or higher APIs
if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
{
// ... and no [user] intervention is needed
retVal = ReachableViaWiFi;
}
}
if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
{
if((flags & kSCNetworkReachabilityFlagsReachable) == kSCNetworkReachabilityFlagsReachable) {
if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection) {
retVal = ReachableVia3G;
if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired) {
retVal = ReachableVia2G;
}
}
}
}
return retVal;
}
// Check if the current network connection is working properly
-(BOOL)connectedToNetWork
{
struct sockaddr_in zeroAddress;
bzero(&zeroAddress, sizeof(zeroAddress));
zeroAddress.sin_len = sizeof(zeroAddress);
zeroAddress.sin_family = AF_INET;
SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
SCNetworkReachabilityFlags flags;
BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
CFRelease(defaultRouteReachability);
if (!didRetrieveFlags) {
printf("Error. Count not recover network reachability flags\n");
return NO;
}
BOOL isReachable = flags & kSCNetworkFlagsReachable;
BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
return (isReachable && !needsConnection) ? YES : NO;
}
// Check the network connection type
-(void)checkNetworktype:(id)sender{
NSString *connectionKind;
if ([self connectedToNetWork]) {
hostReach = [Reachability reachabilityWithHostName:@"www.google.com"];
switch ([hostReach currentReachabilityStatus]) {
case NotReachable:
connectionKind = @" No network links ";
break;
case ReachableViaWiFi:
connectionKind = @" The type of network currently in use is WIFI";
break;
case ReachableVia3G:
connectionKind = @" The type of network link currently in use is WWAN ( 3G ) ";
break;
case ReachableVia2G:
connectionKind = @" The type of network link currently in use is WWAN ( 2G ) ";
break;
default:
break;
}
}else {
connectionKind = @" No network links ";
}
}