Question

我正在尝试使用来自服务器的HTTP Post请求来获取JSON，但我认为请求的主体有误。我尝试了一切，但找不到解决方案。该应用程序崩溃了。

我在请求的正文（newTodo变量）上尝试了一些不同的语法，例如：

'{“ api_key”：“ mykey123”，“ api_secret”：“ asdfg”，“ uniqueid”：“ csd23cdse34ww”，“密码”：“ secret123”，“ pin”：“ 12345”}'

和

[“ api_key”：“ mykey123”，“ api_secret”：“ asdfg”，“ uniqueid”：“ csd23cdse34ww”，“ password”：“ secret123”，“ pin”：“ 12345”]

由于上述原因，我出现了错误：

[“ api_key”：“ mykey123”，“ password”：“ flibble1”，“ uniqueid”：“ csd23cdse34ww”，“ api_secret”：“ secret123”，“ pin”：“ 12345”]   2019-01-25 10：00：54.298086 + 0000 APPTEST [8863：646933] [记录]表“用户”已存在   表“用户”已存在（代码：1）。
  解析来自/ todos上POST的响应

在Postman身上可以很好地工作

'{ “ api_key”：“ mykey123”， “ api_secret”：“ asdfg”， “ uniqueid”：“ csd23cdse34ww”， “ password”：“ secret123”， “ pin”：“ 12345”， }'

但是Xcode要求我使用下面的语法。

func loginPressed() {
    let todosEndpoint: String = "https://mydevapi.com/authenticateuser"
    guard let todosURL = URL(string: todosEndpoint) else {
        print("Error: cannot create URL")
        return
    }
    var todosUrlRequest = URLRequest(url: todosURL)
    todosUrlRequest.httpMethod = "POST"

    let newTodo = "{\"api_key\":\"mykey123\",\"api_secret\":\"asdfg\",\"uniqueid\":\"csd23cdse34ww\",\"password\":\"secret123\",\"pin\":\"12345\"}"

    let jsonTodo: Data
    do {
        jsonTodo = try JSONSerialization.data(withJSONObject: newTodo, options: [])
        todosUrlRequest.httpBody = jsonTodo
        print(newTodo)
    } catch {
        print("Error: cannot create JSON from todo")
        return
    }

    let session = URLSession.shared

    let task = session.dataTask(with: todosUrlRequest) {
        (data, response, error) in
        guard error == nil else {
            print("error calling POST on /todos/1")
            print(error!)
            return
        }
        guard let responseData = data else {
            print("Error: did not receive data")
            return
        }

        // parse the result as JSON, since that's what the API provides
        do {
            guard let receivedTodo = try JSONSerialization.jsonObject(with: responseData, options: []) as? [String: Any] else {
                    print("Could not get JSON from responseData as dictionary")
            return
            }
            print(receivedTodo)
            print("The todo is: " + receivedTodo.description)

            guard let todoID = receivedTodo["id"] as? Int else {
                print("Could not get todoID as int from JSON")
                print(receivedTodo)
                return
            }
            print("The ID is: \(todoID)")
            print(receivedTodo)
        } catch  {
            print("error parsing response from POST on /todos")
            return
        }
    }
    task.resume()
}

应用程序崩溃-线程1：信号SIGABRT

2019-01-25 09：37：05.762339 + 0000 APPTEST [8601：615340] *由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'* + [NSJSONSerialization dataWithJSONObject：options：错误：]：JSON写入中的无效顶级类型' ***首先抛出调用堆栈：（ 0 CoreFoundation 0x00000001087f11bb exceptionPreprocess + 331 1 libobjc.A.dylib 0x000000010635f735 objc_exception_throw + 48 2 CoreFoundation 0x00000001087f1015 + [NSException提高：格式：] + 197 3 Foundation 0x0000000105eb2dd5 + [NSJSONSerialization dataWithJSONObject：options：error：] + 253 4 APPTEST 0x000000010588ab5e $ S9Bibimoney15LoginControllerC12loginPressedyyF + 2718 5 APPTEST 0x000000010588f79c $ STA.7 + 28 6 APPTEST 0x00000001058924d4 $ S9Bibimoney9LoginViewC06handleB0yyF + 132 7 APPTEST 0x0000000105892534 $ S9Bibimoney9LoginViewC06handleB0yyFTo + 36 8 UIKitCore 0x000000010c876ecb-[UIApplication sendAction：to：from：forEvent：] + 83 9 UIKitCore 0x000000010c2b20bd-[UIControl sendAction：to：forEvent：] + 67 10 UIKitCore 0x000000010c2b23da-[UIControl _sendActionsForEvents：withEvent：] + 450 11 UIKitCore 0x000000010c2b131e-[UIControl touchesEnded：withEvent：] + 583 12 UIKitCore 0x000000010c8b20a4-[UIWindow _sendTouchesForEvent：] + 2729 13 UIKitCore 0x000000010c8b37a0-[UIWindow sendEvent：] + 4080 14 UIKitCore 0x000000010c891394-[UIApplication sendEvent：] + 352 15 UIKitCore 0x000000010c9665a9 __dispatchPreprocessedEventFromEventQueue + 3054 16 UIKitCore 0x000000010c9691cb __handleEventQueueInternal + 5948 17 CoreFoundation 0x0000000108756721 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 18 CoreFoundation 0x0000000108755f93 __CFRunLoopDoSources0 + 243 19 CoreFoundation 0x000000010875063f __CFRunLoopRun + 1263 20 CoreFoundation 0x000000010874fe11 CFRunLoopRunSpecific + 625 21 GraphicsServices 0x000000011047c1dd GSEventRunModal + 62 22 UIKitCore 0x000000010c87581d UIApplicationMain + 140 23 APPTEST 0x0000000105896517主+ 71 24 libdyld.dylib 0x0000000108d93575开始+ 1 25 ??? 0x0000000000000001 0x0 + 1 ） libc ++ abi.dylib：以类型为NSException的未捕获异常终止（lldb）

预期状态码200

Answer 1

我很确定您没有寄出您所期望的。似乎您尝试对“已经是” JSON的字符串进行JSON编码。您应该打印出jsonTodo的内容（您会惊讶地发现会有多少转义。）。如果将JSONSerialization传递给Dictionary，JSONDecoder可能会做正确的事情，但是通过Codeable和{ {1}}协议。

您应该将问题简化为当前的实际问题，以便人们提供帮助。一旦掌握了一切，就可以尝试集中精力在Data对象中创建正确的JSON。

为了获得当前问题的具体答案，您应该使用jsonTodo的内容来修改您的问题。

JSON的语法-正文发布请求-SWIFT4

1 个答案: