针对不同的系统，需要作兼容

iOS 13 之后的系统，需要获取定位权限才能开启获取 SSID

    <key>NSLocationAlwaysUsageDescription</key>
    <string></string>
    <key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
    <string></string>
    <key>NSLocationUsageDescription</key>
    <string></string>
    <key>NSLocationWhenInUseUsageDescription</key>
    <string></string>

对应权限截图为：

image.png

Capability 中还要开启对应权限

拿到 Access WiFi Information

代码

class WiFiSSIDHelper: NSObject {    
    override init() {
        super.init()
    }
    
    // 对于 iOS 13 以上系统需要增加请求定位权限的判断，否则无法获得 SSID
    // 参考链接：https://juejin.im/post/6844903909564088327
    func getWifiSSID() -> String? {
        if #available(iOS 13.0, *) {
            //用户明确拒绝，可以弹窗提示用户到设置中手动打开权限
            if CLLocationManager.authorizationStatus() == .denied {
                print("User has explicitly denied authorization for this application, or location services are disabled in Settings.")
                //使用下面接口可以打开当前应用的设置页面
                //[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
                return nil
            }
            let cllocation = CLLocationManager()
            if !CLLocationManager.locationServicesEnabled() || CLLocationManager.authorizationStatus() == .notDetermined {
                //弹框提示用户是否开启位置权限
                cllocation.requestWhenInUseAuthorization()
                usleep(500)
                //递归等待用户选选择
                return getWifiSSID()
            }
        }

        var wifiName: String? = nil
        let wifiInterfaces = CNCopySupportedInterfaces()
        if wifiInterfaces == nil {
            return nil
        }
        let interfaces = wifiInterfaces as? [AnyHashable]
        for interfaceName in interfaces ?? [] {
            guard let interfaceName = interfaceName as? String else {
                continue
            }
            let dictRef = CNCopyCurrentNetworkInfo(interfaceName as CFString)

            if let dictRef = dictRef {
                let networkInfo = dictRef as? [AnyHashable : Any]
                print("network info -> \(networkInfo ?? [:])")
                wifiName = networkInfo?[(kCNNetworkInfoKeySSID as String)] as? String
            }
        }
        return wifiName
    }
}