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[操作系统]iOS获取网络类型的四种方法


Reachability类只能区分WIFI和WWAN类型,却无法区分2G网和3G网。

网上也有些方法,却都存在Bug。

经过网上查找资料和测试,基本上总结了以下几种方法:

 

1、使用导航栏的方式:(私有API)

代码:

typedef enum {  NetWorkType_None = 0,  NetWorkType_WIFI,  NetWorkType_2G,  NetWorkType_3G,} NetWorkType;


UIApplication *application = [UIApplication sharedApplication];NSArray *subviews = [[[application valueForKey:@"statusBar"] valueForKey:@"foregroundView"]subviews];NSNumber *dataNetWorkItemView = nil;for (id subView in subviews) {  if ([subView isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {      dataNetWorkItemView = subView;      break;    }  }  NetWorkType networkType = NetWorkType_None;  switch ([[dataNetWorkItemView valueForKey:@"dataNetworkType"] integerValue]) {    case 0:      NSLog(@"No wifi or cellular");      networkType = NetWorkType_None;      break;          case 1:      NSLog(@"2G");      networkType = NetWorkType_2G;      break;          case 2:      NSLog(@"3G");      networkType = NetWorkType_3G;      break;         default:            NSLog(@"Wifi");      networkType = NetWorkType_WIFI;      break;  }
return networkType;

  

使用这种方法要确保导航栏没有被隐藏,如果导航栏被隐藏则取不到值。另外,该方法存在Bug,通过Reachability类,在网络类型发生改变时,再执行该代码,获取的网络类型数据没有更新。如果程序进入后台再转到前台,重新执行该代码时,便可以重新获取最新的网络类型数据。这样用户体验不好,当用户在移动中,网络类型发生改变,无法获取最新的网络类型,则页面数据无法更新。(PS:如果哪位大神知道,有什么方法可以刷新数据值,望不吝赐教,感谢!)

 

2、通过SCNetworkReachability类

代码:

  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); //创建测试连接的引用:  SCNetworkReachabilityFlags flags;  SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);  if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)   {    return NetWorkType_None;    }  NetWorkType retVal = NetWorkType_None;  if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)  {    retVal = NetWorkType_WIFI;  }  if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||       (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))  {    if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)     {   retVal = NetWorkType_WIFI;      }  }  if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)  {    if((flags & kSCNetworkReachabilityFlagsReachable) == kSCNetworkReachabilityFlagsReachable) {      if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection) {        retVal = NetWorkType_3G;        if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired) {          retVal = NetWorkType_2G;        }      }    }  }  return retVal;

这种方法跟Reachability的方法相同,也无法区分2G网和3g网,但是网上有人测试可以区分,如果有人知道原因,希望指正,谢谢!

 

3、使用SoftwareUpdateService.framework(私有API)

准备工作:

导出生成私有API的头文件声明
使用私有或未公开的API,首先需要导出其对应的头文件,在头文件里有相关函数的声明。
工具:
class-dump
class-dump可以从编译后的Objective-C的二进制文件中提取对应的数据结构及函数等声明。
使用方法:
为了能在任意目录下使用class-dump命令,首先建议把class-dump文件拷贝到/user/local/bin/目录下,然后就可以在任意目录下执行以下命令:
class-dump /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.0.sdk/System/Library/Frameworks/SoftwareUpdateServices.framework/ >SUKit.h

但是bulidsetting 设置framework的search path 时要设置真实的私有库路径,因为我们要用它的可执行文件,只有头文件是不行的。

代码:

NSBundle *b = [NSBundle bundleWithPath:@"/System/Library/PrivateFrameworks/SoftwareUpdateServices.framework"];   if ([b load]) {    // load Class from STRING   SUNetworkMonitor *networkMonitor = [SUNetworkMonitor sharedInstance];     int netType = [networkMonitor currentNetworkType];     NetWorkType networkType = NetWorkType_None;     switch ( netType ) {       case 0:         NSLog(@"No wifi or cellular");         networkType = NetWorkType_None;         break;       case 1:         NSLog(@"WIFI");         networkType = NetWorkType_WIFI;        break;       case 2:         NSLog(@"2G");         networkType = NetWorkType_2G;        break;               case 3:         NSLog(@"3G");         networkType = NetWorkType_3G;         break;       default:         break;    }
return networkType; } return NetWorkType_None;

  

这种方法可以获取网络类型,并且在网络类型改变时,获取最新的网络类型。目前还没有发现Bug,只是准备阶段的工作比较麻烦。

 

4、最后一种方法,就是利用IOS7系统自带的API获取。只是,IOS7以下的系统版本需要上述的方法获取网络类型。