JSONObject of JSONArray with String values in Swift5 - arrays

Question

I need to create a JSON Object containing two JSON Arrays with a specific structure.
Here is the result I would need:
{"config": [{"battery_state" = "3.12","max_hum" = "33","mode" = "mode"}], "alarms": [{"1" = "12345678"}, {"2" = "22334455"}]}
I tried to use NSMutableDictionary and Arrays but the result is not what I'm expecting
let jsonConfigObject: NSMutableDictionary = NSMutableDictionary()
jsonConfigObject.setValue("33" as String, forKey: "max_hum" as String)
jsonConfigObject.setValue("3.12" as String, forKey: "battery_state" as String)
jsonConfigObject.setValue("mode" as String, forKey: "mode" as String)
let arrayConfig = [jsonConfigObject]
var jsonAlarmObject: NSMutableDictionary = NSMutableDictionary()
jsonAlarmObject.setValue("12345678" as String, forKey: "1" as String)
var arrayAlarms = [jsonAlarmObject]
jsonAlarmObject = NSMutableDictionary()
jsonAlarmObject.setValue("22334455" as String, forKey: "2" as String)
arrayAlarms.append(jsonAlarmObject)
let array = [["config" : arrayConfig], ["alarms" : arrayAlarms]]
The result is the following:
[["config": [{"battery_state" = "3.12";"max_hum" = 33;mode = mode;}]], ["alarms": [{1 = 12345678;}, {2 = 22334455;}]]]
any idea how I can get such JSON Structure ?
EDIT 1
I tried to use the following:
struct Config: Codable {
let battery_state, max_hum, mode: String
enum CodingKeys: String, CodingKey {
case battery_state = "battery_state"
case max_hum = "max_hum"
case mode = "mode"
}
}
var conf = Config(battery_state: "0", max_hum: "5", mode: "A")
var alarms = [[String:String]]()
alarms.append(["1":"123456"])
alarms.append(["2":"123456"])
alarms.append(["nb_alarms":String(Tag.sharedInstance.nb_alarms)])
but it gives me
{"config":[{"current_hum":"56","period":"2","battery_level":"2.9"],"alarms":[{"1":"123456"},{"2":"123456"},{"nb_alarms":"2"}]}
but I would need:
{"config":[{"current_hum":"56","period":"2","battery_level":"2.9"],"alarms":[{"1":"123456","2":"123456","nb_alarms":"2"]}
I need to change my alarm String:String but as I have plenty of data to be added in it I don't know the format of alarm I need to use...

Answer 1

Try this approach, using struct models (MyObject and Config) to ...create a JSON Object containing two JSON Arrays with a specific structure.
This example code shows how to code/decode your object from/to json.
struct MyObject: Codable {
let config: [Config]
let alarms: [[String: String]]
}
struct Config: Codable {
let batteryState, maxHum, mode: String
enum CodingKeys: String, CodingKey {
case batteryState = "battery_state"
case maxHum = "max_hum"
case mode
}
}
// the (corrected) json data
let json = """
{"config": [{"battery_state": "3.12","max_hum": "33","mode" : "mode"}], "alarms": [{"1": "12345678"}, {"2": "22334455"}]}
"""
// initial empty myObject
var myObject = MyObject(config: [], alarms: [])
// json string to MyObject
if let data = json.data(using: .utf8) {
do {
myObject = try JSONDecoder().decode(MyObject.self, from: data)
print("---> myObject: \(myObject)")
} catch {
print("decode error: \(error)")
}
}
// MyObject to json string
do {
let encodedData = try JSONEncoder().encode(myObject)
let theJson = String(data: encodedData, encoding: .utf8)
print("---> theJson: \(theJson!)")
} catch {
print(error)
}
// usage
myObject.config.forEach{ conf in
print("---> conf.batteryState: \(conf.batteryState)")
print("---> conf.maxHum: \(conf.maxHum)")
}
myObject.alarms.forEach{ alarm in
print("---> alarm: \(alarm)")
}