how to post single object as parameter in http request in swift 3

Question

I have test this link too. giving me bad request (400)

using native library not almafire

here is link i've cheeked send object as parameter

please vote me up

here is my full code

guard let url=URL(string: "http://test.com/google/getAddress") else{return}

let parameters=GoogleMap()

var requst=URLRequest(url: url)
requst.httpMethod="POST"
requst.addValue("application/json", forHTTPHeaderField: "Content-Type")
requst.httpMethod="POST"
guard let httpbody=try? JSONSerialization.data(withJSONObject: parameters, options: []) else{return}

requst.httpBody=httpbody

print(url)

let _=URLSession.shared.dataTask(with: requst) { (data, response, error) in
    if let data=data{

        do{
            let json=try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)

            print(json)
        }
        catch{

            print(error)
        }
    }
    }.resume()
    }

my model class

class Model {

    private var latitude:Double?
    private var longitude:Double?

    var _latitude:Double{
        get{
            return latitude!
        }
        set{
            latitude=newValue
        }
    }

    var _longitude:Double{

        get{
            return longitude!
        }
        set{
            longitude=newValue
        }
    }

    func toJSON() -> [String: Any] {
        return [ "latitude": latitude as Any, "longtide": longitude as Any]
    }

}

I have tested as a dictionary but server gives me "bad request" error in its JSON response.

Answer 1

The main problem is that your JSON is using the wrong key for the longitude. You're using longtide, which is obviously not what you intended. If you use longitude, it works fine.

---

A few unrelated observations:

1. You are doing do-catch, but don't have a try. You are using try? which doesn't throw any errors, but rather just returns nil if there was a problem. Therefore is nothing to catch. Use try, not try? if you want to catch the error.

2. You have a curious model object in which you have private properties, but then have computed properties that get and set the private property. If you're not doing anything valuable in your custom getter and setter, you should lose those computed properties entirely because this is just convoluted and inefficient. Plus the underscore convention is used for hidden, private properties, not for properties you expose.

3. One is left to infer that your GoogleMap method is returning a [String: Any] produced by toJSON. In Swift 4, you can use JSONEncoder and make your model object Encodable (or Codable), and you can avoid that toJSON method. Just change GoogleMap to return the simple model object which you can then encode with JSONEncoder.

So, that leaves us with:

let url = URL(string: "http://test.com/google/getAddress")!

var request = URLRequest(url: url)
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
let coordinate = Coordinate(latitude: 34.05222, longitude: -118.242) // set this however you want
request.httpBody = try! JSONEncoder().encode(coordinate)

URLSession.shared.dataTask(with: request) { data, _, error in
    guard let data = data, error == nil else {
        print(error ?? "Unknown error")
        return
    }

    do {
        let responseObject = try JSONSerialization.jsonObject(with: data)
        print(responseObject)
    } catch let parseError {
        print(parseError)
    }
}.resume()

And your model object is reduced to merely:

struct Coordinate: Codable {
    var latitude: Double
    var longitude: Double
}

Or, if you really need it to be a reference type, a class:

class Coordinate: Codable {
    var latitude: Double
    var longitude: Double

    init(latitude: Double, longitude: Double) {
        self.latitude = latitude
        self.longitude = longitude
    }
}

---

If you're stuck in Swift 3, then go ahead and make a dictionary, but I'd make it [String: Double], e.g.

let url = URL(string: "http://ipinbar.net:8080/google/getAddress")!

var request = URLRequest(url: url)
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
let coordinate = Coordinate(latitude: 34.05222, longitude: -118.242) // set this however you want
request.httpBody = try! JSONSerialization.data(withJSONObject: coordinate.dictionary)

URLSession.shared.dataTask(with: request) { data, _, error in
    guard let data = data, error == nil else {
        print(error ?? "Unknown error")
        return
    }

    do {
        let responseObject = try JSONSerialization.jsonObject(with: data)

        print(responseObject)
    } catch let parseError {
        print(parseError)
    }
}.resume()

and

struct Coordinate {
    var latitude: Double
    var longitude: Double

    var dictionary: [String: Double] { return ["latitude": latitude, "longitude": longitude] }
}