How to get value from the first 3 rows in TableView using swift? - swift

Question

I retrieve data from MySql via PHP file to get users information and scores to load them in a table. I need to get the value of the first 3 users and put them in a Label outside the Table, it is like game leaders list. I attached an image to explain the idea.
Here is the structure code:
import Foundation
protocol HomeModelProtocol: AnyObject {
func itemsDownloaded(items: NSArray)
}
class HomeModel: NSObject, URLSessionDataDelegate {
weak var delegate: HomeModelProtocol!
let urlPath = "https://mywebsite.com/folder/callUserList.php" //this will be changed to the path where service.php lives
func downloadItems() {
let url: URL = URL(string: urlPath)!
let defaultSession = Foundation.URLSession(configuration: URLSessionConfiguration.default)
let task = defaultSession.dataTask(with: url) { (data, response, error) in
if error != nil {
print("Failed to download data")
}else {
print("Data downloaded")
self.parseJSON(data!)
}
}
task.resume()
}
func parseJSON(_ data:Data) {
var jsonResult = NSArray()
do{
jsonResult = try JSONSerialization.jsonObject(with: data, options:JSONSerialization.ReadingOptions.allowFragments) as! NSArray
} catch let error as NSError {
print(error)
}
var jsonElement = NSDictionary()
let users = NSMutableArray()
for i in 0 ..< jsonResult.count
{
jsonElement = jsonResult[i] as! NSDictionary
let user = UsersModel()
//the following insures none of the JsonElement values are nil through optional binding
if let name = jsonElement["name"] as? String,
let email = jsonElement["email"] as? String,
let phoneNumber = jsonElement["phone"] as? String,
let userImage = jsonElement["image"] as? String
{
user.name = name
user.email = email
user.phoneNumber = phoneNumber
user.userImage = userImage
}
users.add(user)
}
DispatchQueue.main.async(execute: { () -> Void in
self.delegate.itemsDownloaded(items: users)
})
}
}
Here is the model:
import Foundation
class UsersModel: NSObject {
//properties
var name: String?
var email: String?
var phoneNumber: String?
var userImage: String?
//empty constructor
override init()
{
}
//construct with #name, #address, #latitude, and #longitude parameters
init(name: String, email: String, phoneNumber: String, userImage: String) {
self.name = name
self.email = email
self.phoneNumber = phoneNumber
self.userImage = userImage
}
//prints object's current state
override var description: String {
return "Name: \(String(describing: name)), Email: \(String(describing: email)), Phone Number: \(String(describing: phoneNumber)), User Image: \(String(describing: userImage))"
}
}
Here is the code in the TableView controller:
var feedItems: NSArray = NSArray()
override func viewDidLoad() {
super.viewDidLoad()
let homeModel = HomeModel()
homeModel.delegate = self
homeModel.downloadItems()
}
func itemsDownloaded(items: NSArray) {
feedItems = items
self.listTableView.reloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// Return the number of feed items
return feedItems.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Retrieve cell
let cellIdentifier: String = "BasicCell"
let myCell: WinnerTableCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier) as! WinnerTableCell
// Get the location to be shown
let item: UsersModel = feedItems[indexPath.row] as! UsersModel
// Get references to labels of cell
myCell.lbTextName!.text = item.name
return myCell
}
The data shows in the Table but I have no idea how to fill the 3 label with the 3 first users from the Table.
How can I get these values from the table and pass it to a label in the same ViewController?
Thanks
When adding this code:
if feedItems.count >= 3 {
lblFirstWinner.text = feedItems[0].name // 1st winner
lblSecondWinner.text = feedItems[1].name // 2nd winner
lblThirdWinner.text = feedItems[2].name // 3rd winner
}
it shows error: Value of type 'Any' has no member 'name'

Answer 1

Change itemsDownloaded method as
func itemsDownloaded(items: NSArray) {
feedItems = items
self.listTableView.reloadData()
for (index, user) in items.enumerated() {
let user = user as! UserModel
switch index {
case 0: // 1st winner
lblFirstWinner.text = user.name
case 1: // 2nd winner
lblSecondWinner.text = user.name
case 2: // 3rd winner
lblThirdWinner.text = user.name
}
}
}
OR
Change your HomeModelProtocol method and feedItems type to [UsersModel]
protocol HomeModelProtocol: AnyObject {
func itemsDownloaded(items: [UsersModel]) // Changed
}
var feedItems =[UsersModel]() // Changed
override func viewDidLoad() {
super.viewDidLoad()
let homeModel = HomeModel()
homeModel.delegate = self
homeModel.downloadItems()
}
func itemsDownloaded(items: [UsersModel]) {
feedItems = items
self.listTableView.reloadData()
if feedItems.count >= 3 {
lblFirstWinner.text = feedItems[0].name // 1st winner
lblSecondWinner.text = feedItems[1].name // 2nd winner
lblThirdWinner.text = feedItems[2].name // 3rd winner
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// Return the number of feed items
return feedItems.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Retrieve cell
let cellIdentifier: String = "BasicCell"
let myCell: WinnerTableCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier) as! WinnerTableCell
// Get references to labels of cell
myCell.lbTextName!.text = feedItems[indexPath.row].name // Changed
return myCell
}

Answer 2

Just you need to add a few lines in the below function and your solution will be done.
func itemsDownloaded(items: NSArray) {
feedItems = items
self.listTableView.reloadData()
if feedItems.count >= 3 {
lblFirstWinner.text = feedItems[0].name // 1st winner
lblSecondWinner.text = feedItems[1].name // 2nd winner
lblThirdWinner.text = feedItems[2].name // 3rd winner
}
}
Let me know... is it working for you? and please also refer to #vadian comment on your question.