第一步：获取WiFi信息需要在Target—>Capabilities—>Access wifi information 点击允许

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下面是获取WiFi信息的类方法及实现已使用WiFi信息的本地持久化储存，使用中记得更改存储主键值[[NSUserDefaults standardUserDefaults] objectForKey:kDefaultUserID]

//
//  YFWifiItem.h
//  SmartAlarm
//
//  Created by 晴天 on 2018/12/16.
//  Copyright © 2018年 Huang Shan. All rights reserved.
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface YFWifiItem : NSObject <NSCoding>
/** userUUID */
@property (nonatomic, copy)NSString *userUUID;
/** ssid */
@property (nonatomic, copy)NSString *wifiSsid;
/** password */
@property (nonatomic, copy)NSString *wifiPassword;
/** wifiBssid, 网络的IPMac */
@property (nonatomic, copy) NSString *wifiBssid;

// 1.存储或更新WiFi信息
+ (YFWifiItem *)updateOrSavewWithSsid:(NSString *)wifiSsid bssid:(NSString *)bssid wifipassword:(NSString *)password;
// 2.根据SSId拿当前用户存储过的WiFi数据
+ (YFWifiItem *)getWifiItemWithSSID:(NSString *)ssid;

#pragma mark - 获取当前链接的WiFi基本信息
// 获取IP地址
+ (NSString *)deviceIPAdress;
// 获取WiFi的ssid
+ (NSString *)getWifiSSID;
// 获取WiFi的Bssid
+ (NSString *)getWifiBSSID;


@end

NS_ASSUME_NONNULL_END

//
//  YFWifiItem.m
//  SmartAlarm
//
//  Created by 晴天 on 2018/12/16.
//  Copyright © 2018年 Huang Shan. All rights reserved.
//

#import "YFWifiItem.h"
#import <SystemConfiguration/CaptiveNetwork.h>
#import <ifaddrs.h>
#import <arpa/inet.h>

@implementation YFWifiItem

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        _userUUID = [aDecoder decodeObjectForKey:@"userUUID"];
        _wifiSsid = [aDecoder decodeObjectForKey:@"wifiSsid"];
        _wifiPassword = [aDecoder decodeObjectForKey:@"wifiPassword"];
        _wifiBssid = [aDecoder decodeObjectForKey:@"wifiBssid"];
    }
    return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:self.userUUID forKey:@"userUUID"];
    [aCoder encodeObject:self.wifiSsid forKey:@"wifiSsid"];
    [aCoder encodeObject:self.wifiPassword forKey:@"wifiPassword"];
    [aCoder encodeObject:self.userUUID forKey:@"wifiBssid"];
}

// 1.存储或更新WiFi信息
+ (YFWifiItem *)updateOrSavewWithSsid:(NSString *)wifiSsid bssid:(NSString *)bssid wifipassword:(NSString *)password {
    //查看当前是否已经有
    YFWifiItem *wifiItem = [[YFWifiItem alloc] init];
    wifiItem.userUUID = [[NSUserDefaults standardUserDefaults] objectForKey:kDefaultUserID];
    wifiItem.wifiSsid = wifiSsid;
    wifiItem.wifiPassword = password;
    wifiItem.wifiBssid = bssid;
    if (wifiSsid.length > 0) {
        NSString *path = [self getSaveUserWifiPath];
        NSArray *oldDataArr = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
        NSMutableArray *arrM = [NSMutableArray arrayWithArray:oldDataArr];
        if (oldDataArr.count > 0) {
            NSArray *results = [oldDataArr filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"wifiSsid=%@",wifiSsid]];
            [arrM removeObjectsInArray:results];
        }
        [arrM addObject:wifiItem];
        [NSKeyedArchiver archiveRootObject:arrM.copy toFile:path];
    }
    return wifiItem;
}

// 获取当前用户WiFi的存储路径
+ (NSString *)getSaveUserWifiPath {
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES).lastObject stringByAppendingPathComponent:[NSString stringWithFormat:@"UserIdWifi-%@",[[NSUserDefaults standardUserDefaults] objectForKey:kDefaultUserID]]];
    return path;
}

// 2.根据SSId拿当前用户存储过的WiFi数据
+ (YFWifiItem *)getWifiItemWithSSID:(NSString *)ssid {
    if (!ssid.length) {
        return nil;
    }
    NSString *path = [self getSaveUserWifiPath];
    NSArray *oldDataArr = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
    NSArray *results = [oldDataArr filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"wifiSsid=%@",ssid]];
    if (results.count > 0) {
        return results.lastObject;
    }else {
        return nil;
    }
}

#pragma mark -获取WiFi基本信息
+ (NSString *)deviceIPAdress {
    //出处： https://www.jianshu.com/p/c3499d8e9a72
    NSString *address = @"an error occurred when obtaining ip address";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    
    success = getifaddrs(&interfaces);
    
    if (success == 0) { // 0 表示获取成功
        
        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"]) {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            
            temp_addr = temp_addr->ifa_next;
        }
    }
    freeifaddrs(interfaces);
    
    return address;
}

/// 获取wifi名称
+ (NSString *)getWifiSSID {
    NSString *ssid = nil;//NSLocalizedString(@"未连接WiFi", nil);
    NSDictionary *info = [self getWifiInfo];
    if (info != nil) {
        ssid = [info objectForKey:@"SSID"];
    }
    return ssid;
}
/// 获取WiFi的Bssid
+ (NSString *)getWifiBSSID {
    NSString *bSsid = nil;//NSLocalizedString(@"未连接WiFi", nil);
    NSDictionary *bssidInfo = [self getWifiInfo];
    if (bssidInfo != nil) {
        bSsid = [bssidInfo objectForKey:@"BSSID"];
    }
    return bSsid;
}

+ (NSDictionary *)getWifiInfo
{
    NSArray *interfaceNames = CFBridgingRelease(CNCopySupportedInterfaces());
    
    NSDictionary *SSIDInfo;
    for (NSString *interfaceName in interfaceNames) {
        SSIDInfo = CFBridgingRelease(
                                     CNCopyCurrentNetworkInfo((__bridge CFStringRef)interfaceName));
        
        BOOL isNotEmpty = (SSIDInfo.count > 0);
        if (isNotEmpty) {
            break;
        }
    }
    return SSIDInfo;
}

@end

获取WiFi列表实现可参考：
获取WiFi列表信息https://group.cnblogs.com/topic/78158.html