iOS 中可获取当前网络接口的 SSID 和 BSSID 信息，如下:

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NSString *ssid = @"";
NSString *bssid = @"";
NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
NSDictionary *info;
if ([ifs count] > 0) {
    for (NSString *ifname in ifs) {
        info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifname);
        
        NSString *ssidKey =  (__bridge_transfer NSString *)kCNNetworkInfoKeySSID;
        NSString *bssidKey = (__bridge_transfer NSString *)kCNNetworkInfoKeyBSSID;
        if (info) {
            ssid = info[ssidKey];
            bssid = info[bssidKey];
            NSLog(@"ssid: %@", ssid);
            NSLog(@"bssid: %@", bssid);
        }
    }
}

需引入头文件:

#import <SystemConfiguration/CaptiveNetwork.h>

CNCopySupportedInterfaces 返回的是所有网络接口的名字，不过通常只有一个，如 en0, 然后根据获取的网络接口名得到对应于该网络接口的网络信息字典，该字典中包含了 SSID, BSSID, SSIDDATA 信息，字典中包含key在 CaptiveNetwork Info Keys 中有说明。

参考:

CaptiveNetwork Reference

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