我正在尝试使用 Swift 4 Codable 功能,但陷入了这种情况:
struct Message:Codable {
let message: String
let timestamp: String
let latitude: String
let longitude: String}
这是我的结构。
guard let url = URL(string:"http://localhost:443/api/message") else {return}
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
print("POSTED")
let newPost = Message(message: "Hi", timestamp: "1", latitude: "1.1", longitude: "2.2")
print("NewPost:",newPost)
do {
let jsonBody = try JSONEncoder().encode(newPost)
request.httpBody = jsonBody
} catch let err {
print("jsonBody Error: ",err)
}
let session = URLSession.shared
let task = session.dataTask(with: request){ (data,response,err) in
guard let data = data else {return}
do{
let sendPost = try JSONDecoder().decode(Message.self, from: data)
print("sendPost:\(sendPost)")
}catch let err{
print("Session Error: ",err)
}
}
task.resume()
}
这是我用于发布请求的功能。在 print("NewPost:",newPost) 中,它打印
NewPost: Message(message: "Hi", timestamp: "1", latitude: "1.1", longitude: "2.2")
这看起来与我看到的其他示例非常相似,但是通过 catch 总是有一个会话错误
Session Error: keyNotFound(DeadDrop.Message.(CodingKeys in _5C64F74710315F52702B56CE54E28C19).message, Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key message (\"message\").", underlyingError: nil))
我只是不明白这是怎么出现的!我正在使用完全相同的结构,它说这个没有密钥?!谢谢你的帮助!