What is the best way to make this API request in Swift? - swift

Question

Sorry if this question is too repetitive here but I cant figured out how to made it :(
I need to send data to an API (https://www.opticutter.com/public/doc/api#introduction) my data comes from somes TextFields and this is what the API expect.
curl -H "Content-type: application/json" \
-H "Authorization: Bearer <TOKEN>" \
-X POST -d '{
"stocks" : [{
"length" : "60",
"width" : "40",
"count": "10",
"grainDirection": null
},{
"length" : "40",
"width" : "35",
"grainDirection": null
}],
"requirements" : [{
"length" : "30",
"width" : "20",
"count": "8",
"grainDirection": null
},
{
"width" : "20",
"length" : "20",
"count": "3",
"grainDirection": null
}],
"settings" : {
"kerf": "0"
}
}'
So I already have the code to make the request but I cant realize how convert the data into that.
Hope do you understand what I need.
Thanks in advance!

Answer 1

The best approach in my opinion is to map your data into structs/classes and use the Decodable protocol.
struct Stock: Encodable {
let length: Int
let width: Int
let count: Int
let grainDirection: Int?
}
struct Requirement: Encodable {
let length: Int
let width: Int
let count: Int
let grainDirection: Int?
}
struct Setting: Encodable {
let kerf: Int
}
struct MyObject: Encodable {
let stocks: [Stock]
let requirements: [Requirement]
let settings: [Setting]
}
Then you build the MyObject with the data from the textfields:
let myObjectData = MyObject(stocks: [
Stock(length: 60, width: 40, count: 10, grainDirection: nil),
Stock(length: 40, width: 35, count: 0, grainDirection: nil)
],
requirements: [
Requirement(length: 30, width: 20, count: 8, grainDirection: nil),
Requirement(length: 20, width: 20, count: 3, grainDirection: nil),
],
settings: [Setting(kerf: 0)])
Finally on the request you would have to encode the data, converting it into a JSON String for example:
do {
let jsonData = try JSONEncoder().encode(myObjectData)
let jsonString = String(data: jsonData, encoding: .utf8)
print(jsonString)
} catch {
debugPrint(error)
}
This will produce a json string with the following result:
{
"stocks":[
{
"width":40,
"count":10,
"length":60
},
{
"width":35,
"count":0,
"length":40
}
],
"requirements":[
{
"width":20,
"count":8,
"length":30
},
{
"width":20,
"count":3,
"length":20
}
],
"settings":[
{
"kerf":0
}
]
}