方法一:使用NetworkExtension/NEHotspotHelper来获取WIFI信息。但是得向苹果申请权限,比较麻烦

方法二:通过获取状态栏，然后遍历状态栏的视图

1.因为iPhoneX机型以上UIStatusBar 和 iPhoneX机型以下UIStatusBar的视图结构是不同的，所以先判断机型

+ (BOOL)isIponeXLaterDevice{
    UIApplication *app = [UIApplication sharedApplication];
    id statusBar = [app valueForKeyPath:@"_statusBar"];
    if([statusBar isKindOfClass:
        NSClassFromString(@"UIStatusBar_Modern")]){
        return YES;
    }else{
        return NO;
    }
}

2.通过结构获取网络类型

+ (NSString *)getNetworkType
{
    UIApplication *app = [UIApplication sharedApplication];
    id statusBar = [app valueForKeyPath:@"statusBar"];
    NSString *network = @"";
    if ([self isIponeXLaterDevice]) {
        id statusBarView = [statusBar valueForKeyPath:@"statusBar"];
        UIView *foregroundView = [statusBarView valueForKeyPath:@"foregroundView"];
        
        NSArray *subviews = [[foregroundView subviews][2] subviews];
        for (id subview in subviews) {
            if ([subview isKindOfClass:NSClassFromString(@"_UIStatusBarWifiSignalView")]) {
                network = @"WIFI";
            }else if ([subview isKindOfClass:NSClassFromString(@"_UIStatusBarStringView")]) {
                network = [subview valueForKeyPath:@"originalText"];
            }
        }
    }else {
        //非iPhone X
        UIView *foregroundView = [statusBar valueForKeyPath:@"foregroundView"];
        NSArray *subviews = [foregroundView subviews];
        
        for (id subview in subviews) {
            if ([subview isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
                int networkType = [[subview valueForKeyPath:@"dataNetworkType"] intValue];
                switch (networkType) {
                    case 0:
                        network = @"NONE";
                        break;
                    case 1:
                        network = @"2G";
                        break;
                    case 2:
                        network = @"3G";
                        break;
                    case 3:
                        network = @"4G";
                        break;
                    case 5:
                        network = @"WIFI";
                        break;
                    default:
                        break;
                }
            }
        }
    }
    if ([network isEqualToString:@""]) {
        network = @"NO DISPLAY";
    }
    return network;
}

3.获取信号强度(WIFI和蜂窝网络)

+ (int)getSignalStrength{
    
    int signalStrength = 0;
    //判断类型是否为WIFI
    if ([[self getNetworkType]isEqualToString:@"WIFI"]) {
        UIApplication *app = [UIApplication sharedApplication];
        id statusBar = [app valueForKey:@"statusBar"];
        if ([self isIponeXLaterDevice]) {
            // iPhone X
            id statusBarView = [statusBar valueForKeyPath:@"statusBar"];
            UIView *foregroundView = [statusBarView valueForKeyPath:@"foregroundView"];
            NSArray *subviews = [[foregroundView subviews][2] subviews];
            
            for (id subview in subviews) {
                if ([subview isKindOfClass:NSClassFromString(@"_UIStatusBarWifiSignalView")]) {
                    signalStrength = [[subview valueForKey:@"numberOfActiveBars"] intValue];
                    break;
                }else if ([subview isKindOfClass:NSClassFromString(@"_UIStatusBarStringView")]) {
                    signalStrength = [[subview valueForKey:@"numberOfActiveBars"] intValue];
                    break;
                }
            }
            
        }else {
            // 非iPhone X
            UIView *foregroundView = [statusBar valueForKey:@"foregroundView"];
            
            NSArray *subviews = [foregroundView subviews];
            NSString *dataNetworkItemView = nil;
            
            for (id subview in subviews) {
                if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]] && [[self getNetworkType] isEqualToString:@"WIFI"] && ![[self getNetworkType] isEqualToString:@"NONE"]) {
                    dataNetworkItemView = subview;
                    signalStrength = [[dataNetworkItemView valueForKey:@"_wifiStrengthBars"] intValue];
                    break;
                }
                if ([subview isKindOfClass:[NSClassFromString(@"UIStatusBarSignalStrengthItemView") class]] && ![[self getNetworkType] isEqualToString:@"WIFI"] && ![[self getNetworkType] isEqualToString:@"NONE"]) {
                    dataNetworkItemView = subview;
                    signalStrength = [[dataNetworkItemView valueForKey:@"_signalStrengthRaw"] intValue];
                    break;
                }
            }
        }
    }
    return signalStrength;
}