convert alamofire json response to variable - ios

Question

I have a question that I already asked several times on stackoverflow and I have tried all of them, there is none of them worked. So I would love to summarize the question for another time, and try to describe it more precise.
I am building an app sending a picture to a python back end for the result of image recognition in xcode swift.
And I am using Alamofire to upload,
here is the uploading part:
Alamofire.upload(multipartFormData: { multipartFormData in
multipartFormData.append(imageData!, withName: "pic", fileName: "filename.png", mimeType: "image/png")
}, to: "http:123456.com/image",
method: .post,
encodingCompletion: { encodingResult in
switch encodingResult {
case .success(let upload, _, _):
upload.responseString { response in
debugPrint(response)
}
case .failure(let encodingError):
print(encodingError)
}
And here is the json response I got from the server end:
[Response]: <NSHTTPURLResponse: 0x600000237de0> { URL: 1234/image } { Status Code: 200, Headers {
"Content-Length" = (
348
);
"Content-Type" = (
"text/html; charset=utf-8"
);
Date = (
"Mon, 09 Apr 2018 20:59:30 GMT"
);
Server = (
"Werkzeug/0.12.2 Python/2.7.12"
);
} }
[Data]: 348 bytes
[Result]: SUCCESS: {
"prediction": [
{
"name": "marshmallow",
"value": 0.2800232470035553
},
{
"name": "caesar salad",
"value": 0.090629942715168
},
{
"name": "egg",
"value": 0.07480788230895996
},
{
"name": "apple",
"value": 0.049235329031944275
},
{
"name": "chickpea",
"value": 0.04692944884300232
}
]
}
[Timeline]: Timeline: { "Request Start Time": 545000363.584, "Initial Response Time": 545000363.642, "Request Completed Time": 545000370.462, "Serialization Completed Time": 545000370.487, "Latency": 0.058 secs, "Request Duration": 6.879 secs, "Serialization Duration": 0.025 secs, "Total Duration": 6.903 secs }
So, the purpose I want to have, is just print the name of the first prediction's name.
like the output is
outcome is marshmallow with a value of 0.28
I have tried several ways:
First, I want to have a struct to store the name as string, value as double, and use a loop to parse it. But whatever I tried, I always get a "null" as output, or nothing.
Any suggestions on this? Thanks in advance.

Answer 1

try this:
upload.responseJSON { response in
if let result = response.result.value {
let json = result as! [String: Any]
if let predictionArray = json["prediction"] as? [[String: Any]],
let firstPrediction = predictionArray.first {
print(firstPrediction)
}
print(json)
}
}