在开发中, 需要获取 WiFi 信息的一些方法, 在此记录下来:

#import <NetworkExtension/NEHotspotHelper.h>
#import <SystemConfiguration/CaptiveNetwork.h>

#import <arpa/inet.h>
#import <netinet/in.h>
#import <ifaddrs.h>

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    NSDictionary * WiFiInfo = [self fetchSSIDInfo];
    NSLog(@"WiFiInfo == %@",WiFiInfo);
    
    //WiFi 名称
    NSString *WiFiName = [self fetchWiFiName];
    NSLog(@"WiFiName == %@",WiFiName);
    
    //
    NSString *Ip = [self getLocalIPAddressForCurrentWiFi];
    NSLog(@"Ip == %@",Ip);
    
    NSMutableDictionary *data = [self getLocalInfoForCurrentWiFi];
    NSLog(@"广播地址、子网掩码、端口 == %@",data);
    
}

//获取WiFi 信息，返回的字典中包含了WiFi的名称、路由器的Mac地址、还有一个Data(转换成字符串打印出来是wifi名称)
- (NSDictionary *)fetchSSIDInfo {
    
    NSArray *ifs = (__bridge_transfer NSArray *)CNCopySupportedInterfaces();
    
    if (!ifs) {
        
        return nil;
        
    }
    
    NSDictionary *info = nil;
    
    for (NSString *ifnam in ifs) {
        
        info = (__bridge_transfer NSDictionary *)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
        
        if (info && [info count]) { break; }
        
    }
    
    return info;
    
}

//获取 WiFi 名称
- (NSString *)fetchWiFiName {
    
    NSArray *ifs = (__bridge_transfer NSArray *)CNCopySupportedInterfaces();
    
    if (!ifs) {
        
        return nil;
        
    }
    
    NSString *WiFiName = nil;
    
    for (NSString *ifnam in ifs) {
        
        NSDictionary *info = (__bridge_transfer NSDictionary *)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
        
        if (info && [info count]) {
            
            // 这里其实对应的有三个key:kCNNetworkInfoKeySSID、kCNNetworkInfoKeyBSSID、kCNNetworkInfoKeySSIDData，
            
            // 不过它们都是CFStringRef类型的
            
            WiFiName = [info objectForKey:(__bridge NSString *)kCNNetworkInfoKeySSID];
            
            //            WiFiName = [info objectForKey:@"SSID"];
            
            break;
            
        }
        
    }
    
    return WiFiName;
}

//获取本机在WiFi环境下的IP地址
- (NSString *)getLocalIPAddressForCurrentWiFi
{
    NSString *address = nil;
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    
    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    if (success == 0) {
        // Loop through linked list of interfaces
        temp_addr = interfaces;
        while(temp_addr != NULL) {
            if(temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                    return address;
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
        freeifaddrs(interfaces);
    }
    return nil;
}

//获取本机在WiFi环境下的IP地址, 广播地址、子网掩码、端口等，组装成一个字典。
- (NSMutableDictionary *)getLocalInfoForCurrentWiFi {
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    
    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    if (success == 0) {
        // Loop through linked list of interfaces
        temp_addr = interfaces;
        //*/
        while(temp_addr != NULL) {
            if(temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    
                    //----192.168.1.255 广播地址
                    NSString *broadcast = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)];
                    
                    if (broadcast) {
                        [dict setObject:broadcast forKey:@"broadcast"];
                    }
                    NSLog(@"broadcast address--%@",broadcast);
                    //--192.168.1.106 本机地址
                    NSString *localIp = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                    if (localIp) {
                        [dict setObject:localIp forKey:@"localIp"];
                    }
                    NSLog(@"local device ip--%@",localIp);
                    //--255.255.255.0 子网掩码地址
                    NSString *netmask = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_netmask)->sin_addr)];
                    if (netmask) {
                        [dict setObject:netmask forKey:@"netmask"];
                    }
                    NSLog(@"netmask--%@",netmask);
                    //--en0 端口地址
                    NSString *interface = [NSString stringWithFormat:@"%d",temp_addr->ifa_flags];
                    if (interface) {
                        [dict setObject:interface forKey:@"interface"];
                    }
                    NSLog(@"interface--%@",interface);
                    return dict;
                }
            }
            
            temp_addr = temp_addr->ifa_next;
        }
    }
    
    // Free memory
    freeifaddrs(interfaces);
    return dict;
}