ios - 通过 URL 将 token 传递到 Webview IOS Swift

Question

您好，我正在使用 webview 在我的应用程序上显示我的内容。我成功注册了 firebase。现在我想通过 URL 传递注册 token 以存储到数据库中以进行自定义通知。

appdelegate.swift

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    let token = deviceToken.map {String (format: "%02.2hhx", $0)}.joined()
    print(token)
}

Firebase

extension AppDelegate: MessagingDelegate {
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
    print("Firebase registration token: \(fcmToken)")

    //Saving fcmToken to pass to the url
    let preferences = UserDefaults.standard
    preferences.setValue(fcmToken, forKey: "token")
    preferences.synchronize()


    let dataDict:[String: String] = ["token": fcmToken]
    NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
    // TODO: If necessary send token to application server.
    // Note: This callback is fired at each app startup and whenever a new token is generated.
}

这是用于viewcontroller.swift

override func viewDidLoad() {
    super.viewDidLoad()

    //Retrieving the fcmToken
    let prefs = UserDefaults.standard
    let token = prefs.string(forKey: "token")
    //?token= \(token as Optional)&device=ios
    webView.load(URLRequest(url: URL(string: "https://instaglamexpress.com/app/customer/?device=ios&token=\(String(describing: token))")!))
}

我无法将 token 发送到 URL..

请提出解决方案。

Answer 1

您需要使用 if let 进行可选绑定(bind)，因为 prefs.string(forKey: "token") 将返回可选值。

考虑下面的代码:

let prefs = UserDefaults.standard
if let token = prefs.string(forKey: "token") {
    //token is not optional anymore
    webView.load(URLRequest(url: URL(string: "https://instaglamexpress.com/app/customer/?device=ios&token=\(token))")!))  
}

或者您可以使用 guard let 来完成相同的工作。