ios 获取当前wifi名称

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;

}