ios 获取当前wifi名称

原文地址：http://www.cnblogs.com/geweb/p/CaptiveNetwork.html

ios5之前可以通过读取配置文件获取，ios5以后苹果修改wifi列表文件位置，只有root权限才可以读取.

ios4:/System/Library/SystemConfiguration/WiFiManager.bundle/WiFiManager

ios5:/System/Library/SystemConfiguration/IPConfiguration.bundle/IPConfiguration

 

官方的API没有提供获取扫描所有wifi列表，相近功能的只有CaptiveNetwork，获取当前wifi的名称。

引用头文件<SystemConfiguration/CaptiveNetwork.h>

/*!
 @function CNCopySupportedInterfaces
 @discussion copies a list of all interfaces CaptiveNetworkSupport is monitoring.
 @result An array of CFStringRef- BSD interface names.
     Returns NULL if an error was encountered.
     You MUST release the returned value.
 */
CFArrayRef
CNCopySupportedInterfaces   ( void )              __OSX_AVAILABLE_STARTING(__MAC_10_8,__IPHONE_4_1);

通过CNCopySupportedInterfaces获取wifi列表，实际测试中返回数组中只有一个值，即当前连接的wifi。

 

- ( NSString  *)currentWifiSSID
{
    NSString  *ssid = nil ;
    NSArray  *ifs = (__bridge   id )CNCopySupportedInterfaces();
    for  ( NSString  *ifname in ifs) {
        NSDictionary  *info = (__bridge id )CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifname);
        if  (info[@ "SSIDD" ])
         {
            ssid = info[@ "SSID" ];
        }
    }
    return  ssid;
}