iOS网络监测如何区分2、3、4G?

首先，引入系统的Reachability类，不知道怎么引入的话，在Xcode，按下shift+command+0，搜索Reachability，看到图中所选的工程下载即可。

导入相关.h文件

#import<CoreTelephony/CTTelephonyNetworkInfo.h>

引入后，Reachability.h文件里面修改NetworkStatus的枚举，

typedef enum : NSInteger {
NotReachable = 0,
ReachableViaWiFi,
ReachableViaWWAN,
kReachableVia2G,
kReachableVia3G,
kReachableVia4G
} NetworkStatus;

在修改下Reachability.m文件

找到

- (NetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags

修改下面的代码

if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
{
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
{

CTTelephonyNetworkInfo * info = [[CTTelephonyNetworkInfo alloc] init];
NSString *currentRadioAccessTechnology = info.currentRadioAccessTechnology;
if (currentRadioAccessTechnology)
{
if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE])
{
returnValue =  kReachableVia4G;
}
else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS])
{
returnValue =  kReachableVia2G;
}
else
{
returnValue =  kReachableVia3G;
}
return returnValue;

}
}

if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection)
{
if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired)
{
returnValue =  kReachableVia2G;
return returnValue;
}
returnValue =  kReachableVia3G;
return returnValue;
}

returnValue = ReachableViaWWAN;
}

如何使用？

在AppDelegate里加入

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//设置状态栏
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];

// 监测网络情况
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reachabilityChanged:)
name: kReachabilityChangedNotification
object: nil];
hostReach = [Reachability reachabilityWithHostName:@"www.baidu.com"];
[hostReach startNotifier];
}

- (void)reachabilityChanged:(NSNotification *)note
{
Reachability* curReach = [note object];
NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
NetworkStatus status = [curReach currentReachabilityStatus];

switch (status)
{

case NotReachable:
break;

case ReachableViaWiFi:
case ReachableViaWWAN:
break;

case kReachableVia2G:
break;

case kReachableVia3G:
break;

case kReachableVia4G:
break;
}
}

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