How to fetch JSON data into UIPickerView in Swift 3.0 ? - php

Question

My question is, how to fetch data from PHP into UIPickerView in Swift 3.0 ?
Currently, I have these code for UIPickerView to create dropdown list. Right now, I can only display the dropdown list value based on variable declare inside xcode var department = ["ICTD","FAD","PSD"]
dropdown.swift
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate {
#IBOutlet var departmentLbl: UITextField!
#IBOutlet var dropdownLbl: UIPickerView!
#IBOutlet var outputLbl: UILabel!
#IBOutlet var user_idLbl: UILabel!
var department = ["ICTD","FAD","PSD"]
var user_id: String!
override func viewDidLoad() {
super.viewDidLoad()
user_id = "ID001" // these value that need to be past to PHP
let url = URL(string: "http://localhost/getdepartment.php")
let session = URLSession.shared
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST"
let LoginDataToPost = "user_id=\(user_id!)"
request.httpBody = LoginDataToPost.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(data, response, error) in
if error != nil { return }
else {
do {
if let json = try JSONSerialization.jsonObject(with: data!) as? [String: String] {
DispatchQueue.main.async {
let display = Int(json["display"]!)
let realname = json["real_name"]
let department = json["dept"]
if(display == 1) {
// dropdown list value display here
return
}
else { return }
}
}
else { }
}
catch {}
}
})
task.resume()
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
var countrows : Int = department.count
if pickerView == dropdownLbl {
countrows = self.department.count
}
return countrows
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == dropdownLbl {
let titleRow = department[row]
return titleRow
}
return ""
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if pickerView == dropdownLbl {
self.departmentLbl.text = self.department[row]
self.dropdownLbl.isHidden = true
}
}
func textFieldDidBeginEditing(_ textField: UITextField) {
if (textField == self.departmentLbl) {
self.dropdownLbl.isHidden = false
}
}
}
And I have these PHP code that gives an output of
real name and department
based on user_id value from x code
getdepartment.php
<?php
$connect = mysqli_connect("","","","");
global $connect;
if (isset($_POST['user_id'])) {
$user_id = $_POST['user_id'];
$sql = "SELECT * FROM table WHERE user_id ='$user_id'";
$result = mysqli_query($connect,$sql);
if($result && mysqli_num_rows($result)>0){
while ($row = mysqli_fetch_array($result)) {
$real_namedb = $row['real_name'];
$dept_db = $row['dept'];
$output = array('real_name' => $real_namedb, 'dept' => $dept_db);
echo json_encode($output);
}
mysqli_free_result($result);
}
else { }
}
?>
These PHP gives an output of JSON data as below:
{"display":"1","real_name":"NAME TEST 1","dept":"ICTD"}
{"display":"1","real_name":"NAME TEST 2","dept":"ICTD"}
Appreciate if someone can help.
Thanks.

Answer 1

I believe you are supposed to create the dropdownlist based on values you received from server. Based on the code you've given in the question, I observed that you were not adding department names you got from the server to your array.
You can make following changes and observe:
if let json = try JSONSerialization.jsonObject(with: data!) as? [String: String]
{
DispatchQueue.main.async
{
let display = Int(json["display"]!)
let realname = json["real_name"]
let departmentName = json["dept"]
if(display == 1) {
// dropdown list value display here
self.department.append(departmentName)
self.dropdownLbl.reloadAllComponents() // this is reference to your pickerView. Make it global and use it
return
}else { return }
}
}
Please let me know if it resolves the problem or not...