How to convert json into String array

Question

Hi I'm very new to Swift and I'm trying to make a simple application.

The app gets data from server as JSON format.

func addLangList(completion: @escaping ([String], [String]) -> Void) {

    let request = NetworkRequest()
    let reqUrl = NetworkInformation.serverAddr + "/word/purpose"
    let parameters: Parameters = ["category": "lang"]
    request.sendGetRequest(url: reqUrl, parameters: parameters, success: { (response) in

        let json = JSON(response)
        let isSuccess = json[ServerResponseKey.KEY_RESULT]


        if isSuccess == true {

            var resultMessage:JSON = json[ServerResponseKey.KEY_MESSAGE]

            let lang = resultMessage["lang"].arrayValue
            let purpose = resultMessage["purpose"].arrayValue


            completion(lang, purpose)
        }

    }, fail: request.CommonNetworkFailureHandler)
}

By using Swiftyjson, the function converts the data received into JSON format. Inside the closure, 'completion' is called for further process in caller. An error occurs at 'completion(lang, purpose). Xcode says

" Cannot convert value of type '[JSON]' to expected argument type '[String]'".

The error, I guess, because .arrayValue doesn't change resultMessage["lang"] into [String] type....Can anyone give me some advice??

Shehata Gamal · Accepted Answer · 2019-09-01 12:00:57Z

2

Those 2 arrays

let lang = resultMessage["lang"].array
let purpose = resultMessage["purpose"].array

are of type JSON which isn't String , you need to cast them

let langStr = lang.map { $0.string }
let purposeStr = purpose.map { $0.string }

edited Sep 1, 2019 at 12:00

answered Sep 1, 2019 at 11:53

Shehata Gamal

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Comments

Creign · Accepted Answer · 2019-09-01 12:49:54Z

1

let langStr = lang.map { $0.string }
let purposeStr = purpose.map { $0.string }

answered Sep 1, 2019 at 12:49

Creign

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3 Comments

Martin R Over a year ago

Answers are more helpful (to the author of the question and to future readers of this thread) if they explain the problem and the solution, instead of posting code only.

Creign Over a year ago

ok.. in this answer, we are mapping the string (as per requirement) value in the json as an assignment to the variable. Please see link below: codeburst.io/swift-map-flatmap-filter-and-reduce-53959ebeb6aa

Trenton McKinney Over a year ago

How do I write a good answer?. Commentary to clarify the answer, belongs in the answer, not a comment. Additionally, you've only retyped the contents of an answer posted prior to this post.

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