首先添加框架:SystemConfiguration.framework

    #import <SystemConfiguration/CaptiveNetwork.h>                - (NSString *) getDeviceSSID        {            NSArray *ifs = (__bridge id)CNCopySupportedInterfaces();                    id info = nil;            for (NSString *ifnam in ifs) {                info = (__bridge id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);                if (info && [info count]) {                    break;                }            }            NSDictionary *dctySSID = (NSDictionary *)info;            NSString *ssid = [[dctySSID objectForKey:@"SSID"] lowercaseString];                    return ssid;                }