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;
}<br>
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。
以上所述就是本文的全部内容了,希望大家能够喜欢。