Modifying a JSON array in a UITableView - ios

Question

I can't seem to understand how a JSON array be edited when presented in a UITableView?
The JSON array looks like the following example:
[
{
"customer": "John",
"status": "Yes",
},
{
"customer": "James",
"status": "No",
},
{
"customer": "Jamie",
"status": "No",
}
]
The way the app currently presents the data in the UITableView:
private func fetchJSON() {
guard let url = URL(string: "https://example/example/example"),
let value = driver.addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed)
else { return }
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = "driver=\(value)".data(using: .utf8)
URLSession.shared.dataTask(with: request) { data, _, error in
guard let data = data else { return }
do {
self.structure = try JSONDecoder().decode([Structure].self,from:data)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
catch {
print(error)
}
}.resume()
}
TableView Delegate code so far:
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if isFiltering() {
return pickup.count
}
print(structure.count)
return structure.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "testingCell", for: indexPath)
let portfolio: Structure
portfolio = structure[indexPath.row]
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
I would like to be able to select the customers names James and Jamie and press a button that will change the status from No to Yes.
How can the selection and update mechanism be created from the apps perspective?
UPDATE:
structure is defined as: var structure = [Structure]()
import UIKit
struct Structure: Codable {
let customer: String
let status: String
}
UPDATE 2:
I am working with the following but I cannot seem to update the API:
func saveToDB(_ structure: Structure) {
do{
let data = try JSONEncoder().encode(structure)
if let str = String(data: data, encoding: .utf8) {
print(str)
guard let url = URL(string: "https://example/example/example"),
else { return }
}
} catch {
print(error)
}
}

Answer 1

You must change the status in structure array w.r.t the selected indexPath and not in the JSON directly.
In tableView(_: didSelectRowAt:) and tableView(_: didDeselectRowAt:), you can simply change the status value of structure at that particular indexPath like so,
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
structure[indexPath.row].status = "Yes"
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
structure[indexPath.row].status = "No"
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
In case the issue is not resolved, do add the definition of Structure along with more details, so I can help you further.
Edit:
First of all, the definition of Structure goes like,
class Structure: Codable {
var customer: String
var status: String
}
The code to update the status of structure an indexPath is:
class VC: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var tableView: UITableView!
var structures = [Structure]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.allowsMultipleSelection = true
fetchJSON()
}
private func fetchJSON() {
//code to fetch data from JSON...
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return structures.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "testingCell", for: indexPath)
cell.textLabel?.text = structures[indexPath.row].customer
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let structure = structures[indexPath.row]
structure.status = "Yes"
saveToDB(structure)
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
let structure = structures[indexPath.row]
structure.status = "No"
saveToDB(structure)
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
func saveToDB(_ structure: Structure) {
//add the code to save structure in DB...
}
}
Now, when saving to the DB, there is no need for the JSON response. You can directly save the structure instance in the DB.
Edit-2:
Update the saveToDB(_:) method to:
func saveToDB(_ structure: Structure) {
do{
let data = try JSONEncoder().encode(structure)
if let str = String(data: data, encoding: .utf8) {
print(str)
//str is the updated Structure that you can send in your API...
}
} catch {
print(error)
}
}
In the above method, you'll get the JSON format of the updated structure instance that you can use to call your API.

Answer 2

Hope this will resolve your problem
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "testingCell", for: indexPath)
let portfolio: Structure = structure[indexPath.row]
cell.accessoryType = portfolio.status == "YES" ? .checkmark : .none
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let status = structure[indexPath.row].status // get current status
structure[indexPath.row].status = status == "YES" ? "NO" : "YES" /// toggle status
tableView.reloadData()
}
No need didDeselectRowAt method.