iOS - Wifi 自动连接

背景：

iOS11后苹果提供 NEHotspotConfigurationManager 类直连周边Wi-Fi，iOS11前只能跳转到系统设置界面手动连接Wi-Fi 。

1. 前往开发者中心给AppID配置连接WIFI权限

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2. Xcode - General - Libraries - 引入NetworkExtension

   
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3. 前往Signing & Capabilities 添加Capability

   
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4. Code 代码

/// 通过WiFi名称和密码连接到指定WiFi
    /// - Parameters:
    ///   - ssid: WiFi SSID
    ///   - pwd: WiFi密码
    ///   - isWEP: 是否是WEP模式
    ///   - complete: 连接成功返回Yes, 失败返回False
    public static func connectWithSSIDAndPwd(
        ssid: String,
        pwd: String,
        isWEP: Bool = false,
        complete: ((Bool, NEHotspotConfigurationError?) -> Void)?) {

        let config = NEHotspotConfiguration.init(ssid: ssid, passphrase: pwd, isWEP: isWEP)
        NEHotspotConfigurationManager.shared.apply(config) { (error) in
            var isSuccess = false

            if error == nil {
                let currentSSID = getWiFiSSID()
                if currentSSID == ssid {
                    isSuccess = true
                } else {
                    isSuccess = false
                }
            } else {
                isSuccess = false
                XCGLog.info(error as Any)
            }

            //存在已经连接的情况，error code = 13 优先考虑isSuccess
            if isSuccess {
                complete?(isSuccess, nil)
            } else {
                // 将连接wifi api返回的error 转化为 NEHotspotConfigurationError 类型
                let errorCode = error != nil ? NEHotspotConfigurationError.init(
                    rawValue: ((error as NSError?)?.code)!
                ) : nil
                if errorCode == .alreadyAssociated {
                    isSuccess = true
                }
                complete?(isSuccess, errorCode)
            }
        }
    }

    /// 获取iPhone当前连接的WiFi SSID
    /// - Returns: SSID
    public static func getWiFiSSID() -> String? {

        if #available(iOS 13.0, *) {
            //系统版本高于13.0 未开启地理位置权限 需要提示一下
            if CLLocationManager.authorizationStatus() == CLAuthorizationStatus.notDetermined {
                let locationManager = CLLocationManager()
                locationManager.requestWhenInUseAuthorization()
            }
        }

        if let interfaces = CNCopySupportedInterfaces(),
            let interfacesArray = CFBridgingRetain(interfaces) as? [AnyObject],
            interfacesArray.isEmpty == false {
            let interfaceName: CFString = interfacesArray[0] as! CFString
            let ussafeInterfaceData = CNCopyCurrentNetworkInfo(interfaceName)
            let interfaceData = ussafeInterfaceData as? [String: Any]
            let ssid = interfaceData?["SSID"] as? String
            XCGLog.info("Get SSID is: \(ssid ?? "nil")")
            return ssid
        }
        return nil
    }

}

注意事项：

1. 每次请求自动连接时，都会有系统弹框请求用户授权。
2. 在自动连接网络后，可能存在网络无法立即请求通的情况， 可以用轮询方式监听。