Parsing JSON Tableview Information as Separate Strings - ios

Question

I am currently trying to use information in Tableview cells that I have populated with JSON to execute various operations but I am unable to call the specific information due to the fact that it isn't in individual strings. Is there any way to take the group of data I have pulled into each tableview cell and turn it into a series of individual strings? Here is what I currently have:
import UIKit
import GoogleMobileAds
class OngoingViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var userUsernameLabel: UILabel!
#IBOutlet weak var bannerView: GADBannerView!
#IBOutlet weak var ongoingTable: UITableView!
var list:[MyStruct] = [MyStruct]()
struct MyStruct
{
var user1 = ""
var user2 = ""
var wager = ""
var amount = ""
init(_ user1:String, _ user2:String, _ wager:String, _ amount:String)
{
self.user1 = user1
self.user2 = user2
self.wager = wager
self.amount = amount
}
}
override func viewDidLoad() {
super.viewDidLoad()
let username = UserDefaults.standard.string(forKey: "userUsername")!
userUsernameLabel.text = username
/// The banner view.
print("Google Mobile Ads SDK version: " + GADRequest.sdkVersion())
bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
bannerView.rootViewController = self
bannerView.load(GADRequest())
ongoingTable.dataSource = self
ongoingTable.delegate = self
get_data("http://cgi.soic.indiana.edu/~team10/ongoingWagers.php")
}
func get_data(_ link:String)
{
let url:URL = URL(string: link)!
var request = URLRequest(url:url);
request.httpMethod = "POST";
let postString = "a=\(userUsernameLabel.text!)";
request.httpBody = postString.data(using: String.Encoding.utf8);
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
self.extract_data(data)
}
task.resume()
}
func extract_data(_ data:Data?)
{
let json:Any?
if(data == nil)
{
return
}
do{
json = try JSONSerialization.jsonObject(with: data!, options: [])
}
catch
{
return
}
guard let data_array = json as? NSArray else
{
return
}
for i in 0 ..< data_array.count
{
if let data_object = data_array[i] as? NSDictionary
{
if let data_user1 = data_object["id"] as? String,
let data_user2 = data_object["id2"] as? String,
let data_wager = data_object["wager"] as? String,
let data_amount = data_object["amount"] as? String
{
list.append(MyStruct(data_user1, data_user2, data_wager, data_amount))
}
}
}
refresh_now()
}
func refresh_now()
{
DispatchQueue.main.async(
execute:
{
self.ongoingTable.reloadData()
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return list.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.ongoingTable.dequeueReusableCell(withIdentifier: "owcell", for: indexPath) as! OngoingTableViewCell
cell.infoLabel.text = list[indexPath.row].user1 + " " + list[indexPath.row].user2 + " " + list[indexPath.row].wager + " " + list[indexPath.row].amount
cell.user1Button.tag = indexPath.row
cell.user1Button.addTarget(self, action: #selector(OngoingViewController.user1Action), for: .touchUpInside)
cell.user2Button.tag = indexPath.row
cell.user2Button.addTarget(self, action: #selector(OngoingViewController.user2Action), for: .touchUpInside)
return cell
}
#IBAction func user1Action(sender: UIButton) {
let user1Alert = UIAlertController(title: "Wait a second!", message: "Are you sure this user has won this wager?", preferredStyle: UIAlertControllerStyle.alert)
user1Alert.addAction(UIAlertAction(title: "Yes", style: UIAlertActionStyle.default, handler: { action in
let user1ConfirmationAlert = UIAlertController(title: "Great!", message: "Please wait for the other user to confirm the winner of this wager.", preferredStyle: UIAlertControllerStyle.alert)
user1ConfirmationAlert.addAction(UIAlertAction(title: "Got It!", style: UIAlertActionStyle.default, handler: nil))
self.present(user1ConfirmationAlert, animated: true, completion: nil)
}))
user1Alert.addAction(UIAlertAction(title: "No", style: UIAlertActionStyle.default, handler: nil))
self.present(user1Alert, animated: true, completion: nil)
}
#IBAction func user2Action(sender: UIButton) {
let user2Alert = UIAlertController(title: "Wait a second!", message: "Are you sure this user has won this wager?", preferredStyle: UIAlertControllerStyle.alert)
user2Alert.addAction(UIAlertAction(title: "Yes", style: UIAlertActionStyle.default, handler: { action in
let user2ConfirmationAlert = UIAlertController(title: "Great!", message: "Please wait for the other user to confirm the winner of this wager.", preferredStyle: UIAlertControllerStyle.alert)
user2ConfirmationAlert.addAction(UIAlertAction(title: "Got It!", style: UIAlertActionStyle.default, handler: nil))
self.present(user2ConfirmationAlert, animated: true, completion: nil)
}))
user2Alert.addAction(UIAlertAction(title: "No", style: UIAlertActionStyle.default, handler: nil))
self.present(user2Alert, animated: true, completion: nil)
}
}
Here is the OngoingTableViewCell subclass:
import UIKit
class OngoingTableViewCell: UITableViewCell {
#IBOutlet weak var infoLabel: UILabel!
#IBOutlet weak var user1Button: UIButton!
#IBOutlet weak var user2Button: UIButton!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}

Answer 1

You have an array of MyStruct structures, that contain entries for user1, user1, wager, and amount. That's good.
You're using tags on the buttons as a way of figuring out the selected cell, which is not ideal. Instead I would suggest using the sender parameter to figure out the indexPath of the cell that contains the button. See the bottom of my answer for the details of a better way to do it.
In any case, once you have a row number, you can easily get to the data for that wager by indexing into your array:
#IBAction func user1Action(sender: UIButton) {
selectedRow = sender.tag
//or, using my function:
selectedRow = tableView.indexPathForView(sender)
//Get the wager for the button the user tapped on.
let thisWager = list[selectedRow]
}
If you want to take action on the wager once the user taps a button in your UIAlertController, don't use a nil handler on the your second alert controller. Instead, pass in a closure that uses the selectedRow parameter from the code above to index into the list of wagers, or even use the thisWager local variable I show in my code.
Getting the indexPath of the button the user taps on:
I created a simple extension to UITableView that lets you pass in a UIView (like the sender from a button action) and get back the indexPath that contains that view.
That extension is dirt-simple. Here's how it looks:
public extension UITableView {
/**
This method returns the indexPath of the cell that contains the specified view
- Parameter view: The view to find.
- Returns: The indexPath of the cell containing the view, or nil if it can't be found
*/
func indexPathForView(_ view: UIView) -> IndexPath? {
let origin = view.bounds.origin
let viewOrigin = self.convert(origin, from: view)
let indexPath = self.indexPathForRow(at: viewOrigin)
return indexPath
}
}
And you can call that function from your button's actions:
#IBAction func buttonTapped(_ button: UIButton) {
if let indexPath = self.tableView.indexPathForView(button) {
print("Button tapped at indexPath \(indexPath)")
}
else {
print("Button indexPath not found")
}
}
The whole project can be found on Github at this link: TableViewExtension