獲取SSID

這個方法在OS X上使用，正常

+ (NSString *)ssid {

    //CWWiFiClient * client = [CWWiFiClient sharedWiFiClient]; //os x 10.10.0 

    CWInterface * interface = [CWInterface interface];

    // interface = [client interface]; //os x 10.10.0 

    return interface.ssid;

}