Printing Contents of TableView in Swift IOS Application - ios

Question

I am making an app with a scene that contains a tableview. Each cell in the table view contains a rating control (made up of 5 stars) and a label. At the click of a button I would like to print all of the labels as well as the number of stars that user has clicked from the rating controls from the entire table view. to the console.
How can I do this?
Here is my tableview(_:cellForRowAt:) method
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Configure the cell
// Table view cells are reused and should be dequeued using a cell identifier
let cellId = "cell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as? MatchingTableViewCell else {
fatalError("The dequeued cell is not an instacne of MatchingTableViewCell")
}
// Fetches the appropriate match for the data source layout.
let match = matching[indexPath.row]
cell.nameLabel.text = match.name
cell.photoImagView.image = match.photo
cell.ratingControl.rating = match.rating
return cell
}
Data model object is an array of structs of Match objects:
import Foundation
import UIKit
import os.log
class Match: NSObject, NSCoding {
// MARK: Properties
var name: String
var photo: UIImage?
var rating: Int
// MARK: Archiving Paths
static let DocumentsDirectory = FileManager().urls(for: .documentDirectory, in: .userDomainMask).first
static let ArchiveURL = DocumentsDirectory?.appendingPathComponent("matching")
// MARK: Types
struct PropertyKey {
static let name = "name"
static let photo = "photo"
static let rating = "rating"
}
init?(name: String, photo: UIImage?, rating: Int) {
// The name must not be empty
guard !name.isEmpty else{
return nil
}
// The rating must be between 0 and 5 inclusively
guard (rating >= 0) && (rating <= 5) else {
return nil
}
// Initialize stored properties
self.name = name
self.photo = photo
self.rating = rating
}
override var description : String {
return "rating \(self.rating) \n"
}
// MARK: NSCoding
func encode(with aCoder: NSCoder) {
aCoder.encode(name, forKey: PropertyKey.name)
aCoder.encode(photo, forKey: PropertyKey.photo)
aCoder.encode(rating, forKey: PropertyKey.rating)
}
required convenience init?(coder aDecoder: NSCoder) {
// The name is required if we cannot decode a name string, the init should fail
guard let name = aDecoder.decodeObject(forKey: PropertyKey.name) as? String else{
os_log("Unable to decode the name for a Match object", log: OSLog.default, type: .debug)
return nil
}
// Because the photo is an optional property of Match, just use conditional cast.
let photo = aDecoder.decodeObject(forKey: PropertyKey.photo) as? UIImage
let rating = aDecoder.decodeObject(forKey: PropertyKey.rating)
// Must call designated init
self.init(name: name, photo: photo, rating: rating as! Int)
}
}
RatingControl.swiift:
import UIKit
#IBDesignable class RatingControl: UIStackView {
// MARK: Properties
private var ratingButtons = [UIButton]()
var rating = 0 {
didSet {
updateButtonSelectionStates()
}
}
#IBInspectable var starSize: CGSize = CGSize(width: 44.0, height: 44.0) {// Defines size of buttons/
didSet{
setupButtons()
}
}
#IBInspectable var starCount: Int = 5 {// Defines number of buttons
didSet{
setupButtons()
}
}
// MARK: Initialization
override init(frame: CGRect) {
super.init(frame: frame)
setupButtons()
}
required init(coder: NSCoder) {
super.init(coder: coder)
setupButtons()
}
// MARK: Private Methods
private func setupButtons(){
// Clear any existing buttons
for button in ratingButtons{
removeArrangedSubview(button)
button.removeFromSuperview()
}
ratingButtons.removeAll()
// Load Button Images
let bundle = Bundle(for: type(of: self))
let filledStar = UIImage(named: "filledStar", in: bundle, compatibleWith: self.traitCollection)
let emptyStar = UIImage(named: "emptyStar", in: bundle, compatibleWith: self.traitCollection)
let highligtedStar = UIImage(named: "highlightedStar", in: bundle, compatibleWith: self.traitCollection)
for _ in 0..<starCount {
// Create the button
let button = UIButton()
// Set the button images
button.setImage(emptyStar, for: .normal)
button.setImage(filledStar, for: .selected)
button.setImage(highligtedStar, for: .highlighted)
button.setImage(highligtedStar, for: [.highlighted, .selected])
// Adding constraints
button.translatesAutoresizingMaskIntoConstraints = false // disables buttons automatically generated constraints
button.heightAnchor.constraint(equalToConstant: starSize.height).isActive = true // defines height
button.widthAnchor.constraint(equalToConstant: starSize.width).isActive = true // defines width
//Setup the button action
button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(button:)), for: .touchUpInside)
// Add button to stack
addArrangedSubview(button)
// Add the new button to the rating button Array
ratingButtons.append(button)
}
updateButtonSelectionStates()
}
// MARK: Button Action
#objc func ratingButtonTapped(button:UIButton){
guard let index = ratingButtons.index(of: button) else {
fatalError("The button, \(button), is not in the ratingButtons array: \(ratingButtons)")
}
// Calculate the rating of the selected button
let selectedRating = index + 1
if selectedRating == rating { // If the selected star represents the current rating, reset the rating to 0
rating = 0
} else{
// Otherwise set the rating to the selected star
rating = selectedRating
}
}
private func updateButtonSelectionStates() { // Update buttons appearance
for (index, button) in ratingButtons.enumerated() {
// If the index of a button is less than the rating, that button should be selected
button.isSelected = index < rating
}
}
}

Answer 1

You've got this wrong. Your table view does not save data, it displays it. You want to have a data model that holds the values you display from your table view. That's what feeds your tableView dataSource methods. Often it will be an array of structs.
You want to print the contents of your table view's data model.
Edit:
Now that you've provided that info we can help you.
Add CustomStringConvertible conformance to your data model:
class Match: NSObject, NSCoding, CustomStringConvertible {
The only requirement for CustomStringConvertible is that you provide a computed property description that's a String:
var description: String {
return "Match(name:\(name),rating:\(rating))"
}
Then in your button action
#IBAction func logInfo(sender: UIButton) {
matching.forEach { print($0) }
}
Since your Match class now conforms to CustomStringConvertible, you can print Match objects directly.
Or if you want indexes:
#IBAction func logInfo(sender: UIButton) {
matching.enumerated()forEach { print(String(format:"%02l", $0.0) + ": " + $0.1) }
}