ios - 将 token 发送到服务器 Swift 3

Question

我正在尝试向我的服务器发送 token 以检查 token 是否仍然有效或已过期。 token 值是从设备上保存的数据中提取的。但无论我尝试什么，它都会给我“丢失的 token ”，这是我发送空字符串时的状态消息。

    // load content in user var
    user = UserDefaults.standard.value(forKey: "parseJSON") as? NSDictionary

    // if user is once logged in / register, keep him logged in
    if user != nil {
        print(user as Any)

        let userToken = user!["token"] as? String

        let url = NSURL(string: "http://fmm.dummy.com/api/v1/auth/me")!

        var request = URLRequest(url: url as URL)

        request.setValue("Bearer \(String(describing: userToken))", forHTTPHeaderField: "Authorization")

        request.httpMethod = "POST"

当我编辑并执行此操作时，错误消息变为“无效 token ”，这意味着我正在发送某些内容。只是不正​​确

    // load content in user var
    user = UserDefaults.standard.value(forKey: "parseJSON") as? NSDictionary

    // if user is once logged in / register, keep him logged in
    if user != nil {
        print(user as Any)

        let userToken = user!["token"] as? String

        let a: Character = "<"
        let b: Character = ">"
        let url = NSURL(string: "http://fmm.dummy.com/api/v1/auth/me")!

        var request = URLRequest(url: url as URL)

        request.setValue("Bearer .append\(a)\(String(describing: userToken)).append\(b)", forHTTPHeaderField: "Authorization")

        request.httpMethod = "POST"


        //launch session
        URLSession.shared.dataTask(with: request) { data, response, error in

有人可以帮我弄清楚哪里做错了吗？谢谢

///编辑嗨，当我按照你的建议进行编辑并想出这个时，我什至无法打印到控制台。这是供您考虑的完整代码。感谢您的回复。如果让 user = UserDefaults.standard.object(forKey: "parseJSON") 作为？ [字符串:任何]， 让 userToken = user["token"] 作为？字符串 {

       let url = URL(string: "http://fmm.dummy.com/api/v1/auth/me")!
       var request = URLRequest(url: url)

       let tokenString = "Bearer " + userToken
       request.setValue(tokenString, forHTTPHeaderField: "Authorization")
       request.httpMethod = "POST"

       //launch session
       URLSession.shared.dataTask(with: request) { data, response, error in

           //check if no error
           if error == nil{

               do {

                   let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

                   guard let parseJSON = json else{

                       print ("Error While Parsing")
                       return
                   }
                   print(parseJSON)

                   let statusMsg = parseJSON["status"] as? String

                   if  statusMsg == "OK"{
                       //token still valid
                       self.login()

                   }else {
                       //token is invalid
                       // get main queue to communicate back to user
                       DispatchQueue.main.async(execute: {
                           let message = parseJSON["status_msg"] as! String
                           appDelegate.infoView(message: message, color: colorSmoothRed)
                       })
                   }



               }catch{
                   // get main queue to communicate back to user
                   DispatchQueue.main.async(execute: {
                       let message = "\(error)"
                       appDelegate.infoView(message: message, color: colorSmoothRed)
                   })
                   return

               }


           }else{

               // get main queue to communicate back to user
               DispatchQueue.main.async(execute: {
                   let message = error!.localizedDescription
                   appDelegate.infoView(message: message, color: colorSmoothRed)
               })
               return
           }
           }.resume()



   }

我正在尝试在 appdelegate.swift 中编写代码来检查从先前登录中保存的 token 是否仍然有效或已过期!用户设备上保存的对象如下。当我将用户打印到控制台时，我得到了这个。::--

可选的({ 回应 = { token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjIsImlzcyI6Imh0dHA6XC9cL3htbS54bW9iaWxlbW9uZXkuY29tXC9hcGlcL3YxXC9hdXRoIiwiaWF0IjoxNDk2ODUyNTkxLCJleHAiOjE0OTY4NTYxOTEsIm5iZiI6MTQ5Njg1MjU5MSwianRpIjoiOTFhYjE0MjZkMGZmN2RjZDVjOTQzNTlkZGY4OGY0ZmYifQ.WaQFprfRbJMDQ72IORtWrcSmUqY3EaJp5BAqjijvUAc"; 已验证 = 1； }; 状态=好的；})

Answer 1

您使用了过多的可选值，这可能会导致意外的文字 "Optional(<value>)"调用 description 时方法。

使用可选绑定(bind)安全地解包所有可选值:

if let user = UserDefaults.standard.object(forKey: "parseJSON") as? [String:Any],
    let userToken = user["token"] as? String {

    let url = URL(string: "http://fmm.dummy.com/api/v1/auth/me")!
    var request = URLRequest(url: url)

    let tokenString = "Bearer " + userToken
    request.setValue(tokenString, forHTTPHeaderField: "Authorization")
    request.httpMethod = "POST"
    ...

一如既往，从不使用valueForKey从 UserDefaults 获取单个对象, 始终使用 objectForKey ，并且从不使用NSDictionary对于符合属性列表的字典，请始终使用 [String:Any] .