How to update observableObject class after value is updated by picker - swiftui - swiftui

Question

I have an ObservableObject class that fetches the remote data based on month and year value. Initially it works fine because I use current month and year values however I want to update and re run the getAttendanceRecord2 when I select some other month from picker. What is the best practice for achieving this?
struct AttendanceRecord: View {
#ObservedObject var item_data: getAttendanceRecord2
let months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November","December"]
init(id: String) {
self.item_data = getAttendanceRecord2(id: id,month: getMonth(), year: getYear())
}
var body: some View {
VStack {
Picker(selection: $selectedMonth, label: Text("Months"), content: {
ForEach(months, id: \.self) {
Text($0)
}
}).pickerStyle(MenuPickerStyle())
Text("You selected: \(selectedMonth)")
}
}
}
Here is my function:
class getAttendanceRecord2: ObservableObject {
#Published var attlist = [EAttendance]()
init(id: String, month: String, year: String) {
let url = URL(string: "http://superteclabs.com/apis2/AttendanceRecord2.php")
var request = URLRequest(url: url!)
request.httpMethod = "POST"
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Accept")
let formdata: Data = "id=\(id)&month=\(month)&year=\(year)".data(using: .utf8)!
request.httpBody = formdata
URLSession.shared.dataTask(with: request) { (response_data, response, error) in
guard error == nil else {
print("Error: error calling POST")
print(error!)
return
}
guard let data = response_data else {
print("Error: Did not receive data")
return
}
guard let response = response as? HTTPURLResponse, (200 ..< 299) ~= response.statusCode else {
print("Error: HTTP request failed")
return
}
do {
let decodedData = try JSONDecoder().decode([EAttendance].self, from:data)
DispatchQueue.main.async {
self.attlist = decodedData
}
} catch {
print("Error: Trying to convert JSON data to string")
return
}
}.resume()
}
}

Answer 1

It can be done in onChange(of:, like
Picker(selection: $selectedMonth, label: Text("Months"), content: {
ForEach(months, id: \.self) {
Text($0)
}
}).pickerStyle(MenuPickerStyle())
.onChange(of: selectedMonth) { newMonth in // << here !!
// process here new selected month as needed
}