Question

该方法工作正常，它在后端执行我想要的操作，但我在控制台中收到以下错误：

错误域= NSCocoaErrorDomain代码= 3840“没有值。” UserInfo = {NSDebugDescription =无值。}

上述错误包含在catch。

中

我读出了类似的问题，建议为标题增加价值，但也没有修复它。

let serverURL = URL(string: "https://xxx/xxx/xxx/xxx/xxx/email")
self.request = URLRequest(url:serverURL!)
self.request?.httpMethod = "POST"
self.request?.addValue("application/json", forHTTPHeaderField: "content-type")
self.request?.addValue("application/json", forHTTPHeaderField: "Accept")

 do {
      self.request?.httpBody = try JSONSerialization.data(withJSONObject: postContent, options: .prettyPrinted)
        } catch let error {
            print(error.localizedDescription)
            return
  }

json的格式为：postContent: [String: String]，["email": "myemail@domain.com"]

任务代码：

let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in

    if (self.activityIndicator != nil) {
        self.removeActivityIndicator(activityIndicator: self.activityIndicator!)
    }

    guard let data = data else {return}

    do {
        let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String:String]

        if let parseJSON = json {
        self.alertMessage(message: "Please check your email for instructions.")
            }
        } else {
            self.alertMessage(message: "Invalid email address!")
        }
    } catch {
        self.alertMessage(message: "Could not send request. Try again!")
        print(error)
    }
}
task.resume()

Answer 1

我认为你有一个拼写错误。你有没有尝试改变

self.request?.addValue("application/json", forHTTPHeaderField: "content-type")

到

self.request?.addValue("application/json", forHTTPHeaderField: "Content-Type")

Answer 2

我得到了200好的回复，但是json的身体被空了：

let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String:String]

我修改了API并添加了主体以响应以修复此问题。

错误域= NSCocoaErrorDomain代码= 3840“没有值。” UserInfo = {NSDebugDescription =无值。}

2 个答案: