I have made this protocol in my cell class
protocol CellDelegate: AnyObject{
func plusButton(tag: Int)
func minusButton(tag: Int)
}
class CartTableViewCell: UITableViewCell {
#IBOutlet weak var plusButton: UIButton!
#IBOutlet weak var minusButton: UIButton!
#IBOutlet weak var itemsCountLabel: UILabel!
weak var delegate: CellDelegate?
var count = 0
var totalAmount = 0.0
var modelPrice:Double = 0.0
override func awakeFromNib() {
super.awakeFromNib()
itemsCountLabel.text = String(count)
}
#IBAction func addButton(_ sender: Any) {
delegate?.plusButton(tag: (sender as AnyObject).tag)
count += 1
totalAmount = modelPrice * Double(count)
itemsCountLabel.text = String(count)
}
#IBAction func minusButton(_ sender: Any) {
delegate?.minusButton(tag: (sender as AnyObject).tag)
if count > 0{
count -= 1
totalAmount = modelPrice * Double(count)
it emsCountLabel.text = String(count)
print(totalAmount)
}
}
}
this is the code I have placed in my cellForRowat method in my viewcontroller
cell.delegate = self
cell.plusButton.tag = indexPath.row
and added this extension
extension ViewController: CellDelegate{
func plusbutton(tag: Int)
func minusButton(tag:Int)}
When I tap on plus button my countLabel is incremented and vise versa. The issue is when I scroll the tableView my values are shuffled(not same). What is the reason and how to solve this.
If I understand your code you modify the value of count in the cell. Do you modify it in your model in the cell delegate aka controller ? I so you need to keep coherency in your cell by either updating the label in the cell or either reload the cell in the cell delegate.
Related
I am quite new to Swift programming and I am trying to set a slider min, max and value in a NSToolbar. As an hypothetical exemple, I have a list of client and I want to use the slider in the toolbar to select a client data page. I will firt to load the client database in the NSViewController and count the number of client. Than I would like to set the slider in the toolbar minvalue to 1 and maxvalue to the number of client. I understand how to send slider values from the Windowcontroller to the ViewController but I did not found how to do the inverse , how to send data from the Viewcontroller to the Window controller in order to set the slider values.
I have attach an simple code based on this exemple https://github.com/gbdavid2/DavidCodes_macOS/tree/master/NSToolbar%20with%20Storyboards/NSToolbar%20with%20Storyboards
In this exemple, the Toolbar shows a Previous and an Next button that , when clicked, they change a counter value (count). I would like to send back that value from the ViewCoOntroller to the WindowController in order to display it in label and eventually, the slider value in the toolbar. Thanks for your help.
// WindowController.swift
import Cocoa
class WindowController: NSWindowController {
#IBOutlet weak var myBoutton: NSToolbarItem!
var viewController: ViewController {
get {
return self.window!.contentViewController! as! ViewController
}
}
override func windowDidLoad() {
super.windowDidLoad()
// Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
//viewController.myLabel.stringValue = "boo"
}
#IBAction func previous(_ sender: Any) {
viewController.updateMyLabelText(newText: "Prev Button clicked! ")
}
#IBAction func next(_ sender: Any) {
viewController.updateMyLabelText(newText: "Next Button clicked! ")
}
}
import Cocoa
class ViewController: NSViewController {
var count : Int = 0
#IBOutlet weak var myLabel: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override var representedObject: Any? {
didSet {
// Update the view, if already loaded.
}
}
func updateMyLabelText(newText: String){
if newText.contains("Prev") {count -= 1}
else if newText.contains("Next") {count += 1}
myLabel.stringValue = newText + String(count)
}
}
Another way to to achieve this is with Cocoa Bindings. Example:
In the toolbar are a Previous button, a Next button and a slider. The actions of the buttons are connected to the First Responder. The action methods are implemented in ViewController. The count property of ViewController has attributes #objc dynamic so it can be used with Cocoa Bindings.
class ViewController: NSViewController {
#objc dynamic var count: Int = 0
#IBAction func previous(_ sender: Any) {
count -= 1
}
#IBAction func next(_ sender: Any) {
count += 1
}
}
The slider in the toolbar is bound to the Window Controller, key path window.contentViewController.count.
In the view is a label with a number formatter. The value of the label is bound to the View Controller, key path count.
The window controller isn't subclassed.
There are multiple ways to achieve this.
One of the way is by creating a class [e.g: SliderManager] which keep tracks of current value and handles increment/decrement. You can get the current value of Slider with the help of Singleton in any Controller.
Here is an example implementation:
protocol SliderCountDelegate: NSObject {
func counterDidUpdate()
}
final class SliderCountManager {
static let shared = SliderCountManager()
var value: UInt8 = 0 // <-- Unsigned Integers: Only Positive numbers
weak var delegate: SliderCountDelegate?
public func increaseCounter() {
value += 1
delegate?.counterDidUpdate()
}
public func decreaseCounter() {
value -= 1
delegate?.counterDidUpdate()
}
}
Here is how you should use this in your code:
// WindowController.swift
import Cocoa
class WindowController: NSWindowController {
#IBOutlet weak var myBoutton: NSToolbarItem!
override func windowDidLoad() {
super.windowDidLoad()
}
#IBAction func previous(_ sender: Any) {
SliderCountManager.shared.increaseCounter()
print(SliderCountManager.shared.value) // <- Accessing Current value here
}
#IBAction func next(_ sender: Any) {
SliderCountManager.shared.decreaseCounter()
print(SliderCountManager.shared.value)
}
}
import Cocoa
class ViewController: NSViewController, SliderCountDelegate {
#IBOutlet weak var myLabel: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
SliderCountManager.shared.delegate = self // Set Delegate to `self`
}
override var representedObject: Any? {
didSet {
}
}
// Protocol conformance
func counterDidUpdate() {
myLabel.stringValue = String(SliderCountManager.shared.value)
}
}
Thanks for the proposed solutions. It certainly put me in the wrigth direction.
Here is what I did. In the WindowController , I set a toolbar with 1) button «previous», 2) button «next» and 3) a slider «slider».
Those are linked to the proper IBOutler and IBaction in the WindowController.
The viewController have a textLabel «myLabel»
The 2 buttons and the slider change the slider_ptr value in the ViewControler and is sent to myLabel. Also, the slider.label change according to the slider_pointer and the slider_max values. Here is the code for the windowController:
import Cocoa
class WindowController: NSWindowController {
#IBOutlet weak var slider: NSSlider!
#IBOutlet weak var sliderTB: NSToolbarItem!
var viewController: ViewController {
get {
return self.window!.contentViewController! as! ViewController
}
}
override func windowDidLoad() {
super.windowDidLoad()
setSlider() // set initial value based on ViewController
}
#IBAction func previous(_ sender: Any) {
viewController.previous (WindowController())
setSlider()
}
#IBAction func next(_ sender: Any) {
//viewController.updateMyLabelText(newText: "Prev Button clicked! ")
viewController.next (WindowController()) //send to VC function previous
// let pt = viewController.slider_ptr + 1
//let sMax = viewController.slider_max
setSlider()
//sliderTB.label = String(pt) + " de " + String(sMax)
}
#IBAction func sliderDidChange(_ sender: Any) {
viewController.sliderDidSlide (WindowController(), pointer: Int(slider.doubleValue))
setSlider()
// viewController.sliderDidSlide(PosiWC(), sValue: myslider.doubleValue)
}
func setSlider() {
/* myslider.minValue = 1
myslider.maxValue = Double(max)
myslider.integerValue = pointer*/
//print ("WCP58:" , myslider.integerValue )
let pt = viewController.slider_ptr
let sMax = viewController.slider_max
//slider (max : pt, pointer: sMax)
sliderTB.label = String(pt) + " de " + String(sMax)
slider.minValue = 1
slider.maxValue = Double(sMax)
slider.integerValue = pt
}
}
and for the Viewcontroller :
class ViewController: NSViewController {
var slider_ptr = 1 // slider position
var slider_max: Int = 0 //
#IBOutlet weak var myLabel: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
slider_max = 250
myLabel.stringValue = String(slider_ptr)
}
override var representedObject: Any? {
didSet {
}
}
func previous(_ sender: Any) {
if slider_ptr > 1 {
slider_ptr -= 1
}
else { NSSound.beep()}
myLabel.stringValue = String(slider_ptr)
}
func next(_ sender: Any) {
if slider_ptr < slider_max {
slider_ptr += 1
}
else { NSSound.beep()}
myLabel.stringValue = String(slider_ptr)
}
func sliderDidSlide(_ sender: Any, pointer : Int) {
print (pointer)
slider_ptr = pointer
myLabel.stringValue = String(slider_ptr)
}
}
I made a table view with a label that increments and decrements on pressing a button and another button to show the text in another label outside the UItableView. Everything works fine but when I scroll the Tableview the value resets to zero!
Before Scrolling
After Scrolling
My ViewController class
class ViewController: UIViewController{
var numArray = [Value]()
var initialValue = 0
#IBOutlet weak var tableView : UITableView!
#IBOutlet weak var lblOutput : UILabel!
override func viewDidLoad() {
super.viewDidLoad()
for _ in 0 ... 100{
numArray.append(Value(number: initialValue))
}
self.lblOutput.text = "\(initialValue)"
tableView.delegate = self
tableView.dataSource = self
tableView.reloadData()
}
}
extension ViewController : UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return numArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "Cell",for: indexPath) as? ControllerTableViewCell else{fatalError("Error in creating cells")}
cell.delegate = self
cell.data = numArray[indexPath.row]
cell.lblInput.text = "\(cell.data.number)"
return cell
}
}
extension ViewController : MyTableViewCellDelegate{
func DidPrint(Data: String) {
self.lblOutput.text = "\(Data)"
}
}
My TableViewCell class
protocol MyTableViewCellDelegate : AnyObject {
func DidPrint(Data: String)
}
class ControllerTableViewCell: UITableViewCell {
weak var delegate : MyTableViewCellDelegate?
var data : Value!
private var counterValue = 0
#IBOutlet var lblInput : UILabel!
#IBOutlet var btnPrint : UIButton!
#IBOutlet var btnPlus : UIButton!
#IBOutlet var btnMinus : UIButton!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
#IBAction func DidPressPrint(){
self.data.number = counterValue
delegate?.DidPrint(Data: "\(data.number)")
print(data.number)
}
#IBAction func DidPressPlus(){
counterValue += 1
data.number = counterValue
self.lblInput.text = "\(data.number)"
}
#IBAction func DidPressMinus(){
if(counterValue > 0){
counterValue -= 1
data.number = counterValue
}
else{
counterValue = 0
data.number = 0
}
self.lblInput.text = "\(data.number)"
}
}
My Data Model
import Foundation
struct Value{
var number : Int
}
As #El Tomato suggested, you are not updating your data source, that's why your changes gets "forgotten" on scroll.
Try to move your didPressPlus, didPressMinus and didPressPrint in your ViewController class and redefine your table view delegate like below.
By passing the tag attributes to the buttons, you can then retrieve the index of the item pressed in the functions and edit the correct data source item.
Also remove the unnecessary MyTableViewCellDelegate.
class ViewController: UIViewController{
var numArray = [Value]()
var initialValue = 0
#IBOutlet weak var tableView : UITableView!
#IBOutlet weak var lblOutput : UILabel!
override func viewDidLoad() {
super.viewDidLoad()
for _ in 0 ... 100 {
numArray.append(Value(number: initialValue))
}
self.lblOutput.text = "\(initialValue)"
tableView.delegate = self
tableView.dataSource = self
}
}
extension ViewController : UITableViewDelegate, UITableViewDataSource
{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return numArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as? ControllerTableViewCell else {fatalError("Error in creating cells")}
let indexItem = indexPath.row
let valueItem = numArray[indexItem]
cell.lblInput.text = valueItem.number
cell.btnMinus.tag = indexItem
cell.btnMinus.addTarget(self, action: #selector(didPressMinus(_:)), for: .touchUpInside)
cell.btnPlus.tag = indexItem
cell.btnPlus.addTarget(self, action: #selector(didPressPlus(_:)), for: .touchUpInside)
cell.btnPrint.tag = indexItem
cell.btnPrint.addTarget(self, action: #selector(didPressPrint(_:)), for: .touchUpInside)
return cell
}
#objc private func didPressPlus(_ sender: UIButton) {
let dataIndex = sender.tag
if numArray.count < dataIndex { return }
let numArrayItem = numArray[dataIndex]
if (numArrayItem.number >= 0) {
numArray[dataIndex].number -= 1
}
tableView.reloadData()
}
#objc private func didPressMinus(_ sender: UIButton) {
let dataIndex = sender.tag
if numArray.count < dataIndex { return }
numArray[dataIndex].number += 1
tableView.reloadData()
}
#objc private func didPressPrint(_ sender: UIButton) {
let dataIndex = sender.tag
if numArray.count < dataIndex { return }
self.lblOutput.text = "\(numArray[dataIndex].number)"
}
}
In order to move the three methods in the ViewController you'll need to remove the two correspondent IBAction from the UITableViewCell class.
Also, remove the linkage with the ControllerTableViewCell actions.
Here is the resulting ControllerTableViewCell:
class ControllerTableViewCell: UITableViewCell {
#IBOutlet var lblInput : UILabel!
#IBOutlet var btnPrint : UIButton!
#IBOutlet var btnPlus : UIButton!
#IBOutlet var btnMinus : UIButton!
override func awakeFromNib() {
super.awakeFromNib()
}
}
Your TableView's numberOfRowsInSection is using numArray as a source (numArray.count) and so is your cellForRowAt function, but your cell functions are updating your 'data' variable. Your 'data' variable is locally defined to your tableView and gets reset every time it is activated (including when you scroll).
You need to update the numArray or some other global resource to make it work. This involves using indexpath of the cell value inside the cell functions, meaning you need a way to refer to indexPath inside the cell. This article explains how to use tags or delegates, https://fluffy.es/handling-button-tap-inside-uitableviewcell-without-using-tag/.
Here's a solution using the existing delegate.
import UIKit
import Foundation
var initialValue = 0
var numArray = Array(repeating: initialValue, count: 100)
class ViewController: UIViewController {
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var lblOutput: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.lblOutput.text = "\(initialValue)"
tableView.delegate = self
tableView.dataSource = self
tableView.reloadData()
// Do any additional setup after loading the view.
}
}
extension ViewController : UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return numArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "Cell",for: indexPath) as? ControllerTableViewCell else{fatalError("Error in creating cells")}
cell.indexPath = indexPath
cell.delegate = self
cell.lblInput.text = String(numArray[indexPath.row])
return cell
}
}
extension ViewController : MyTableViewCellDelegate{
func DidPrint(Data: String) {
self.lblOutput.text = "\(Data)"
}
}
protocol MyTableViewCellDelegate : AnyObject {
func DidPrint(Data: String)
}
class ControllerTableViewCell: UITableViewCell {
weak var delegate : MyTableViewCellDelegate?
var indexPath : IndexPath?
private var counterValue = 0
#IBOutlet var lblInput : UILabel!
#IBOutlet var btnPrint : UIButton!
#IBOutlet var btnPlus : UIButton!
#IBOutlet var btnMinus : UIButton!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
#IBAction func DidPressPrint(){
delegate?.DidPrint(Data: "\(numArray[indexPath!.row])")
}
#IBAction func DidPressPlus(){
numArray[indexPath!.row] = numArray[indexPath!.row] + 1
self.lblInput.text = "\(numArray[indexPath!.row])"
}
#IBAction func DidPressMinus(){
if(numArray[indexPath!.row] > 0){
numArray[indexPath!.row] = numArray[indexPath!.row] - 1
}
else{
numArray[indexPath!.row] = 0
}
self.lblInput.text = "\(numArray[indexPath!.row])"
}
}
I have a custom cell class with two buttons and one label defined in its own class. Am using protocol-delegates to update the value of the label when the button is pressed. But am not able to figure out how to update the UITableView.
protocol customCellDelegate: class {
func didTapDecrementBtn(_ sender: AllCountersTableViewCell)
func didTapIncrementBtn(_ sender: AllCountersTableViewCell)
func updateTableViewCell(_ sender: AllCountersTableViewCell)
}
class AllCountersTableViewCell: UITableViewCell {
#IBOutlet weak var counterValueLbl: UILabel!
#IBOutlet weak var counterNameLbl: UILabel!
#IBOutlet weak var counterResetDateLbl: UILabel!
#IBOutlet weak var counterDecrementBtn: UIButton!
#IBOutlet weak var counterIncrementBtn: UIButton!
weak var delegate: customCellDelegate?
#IBAction func decrementBtnPressed(_ sender: UIButton) {
delegate?.didTapDecrementBtn(self)
delegate?.updateTableViewCell(self)
}
#IBAction func incrementBtnPressed(_ sender: UIButton) {
delegate?.didTapIncrementBtn(self)
delegate?.updateTableViewCell(self)
}
In my ViewController, I have provided the delegate. But reloadData() is not working, so although sender.counterLbl.value is changing its not reflecting on the view.
extension AllCountersVC: customCellDelegate {
func didTapIncrementBtn(_ sender: AllCountersTableViewCell) {
guard let tappedCellIndexPath = tableView.indexPath(for: sender) else {return}
let rowNoOfCustomCell = tappedCellIndexPath[1]
let newValue = String(allCounter[rowNoOfCustomCell].incrementCounterValue(by: allCounter[rowNoOfCustomCell].counterIncrementValue))
sender.counterValueLbl.text = newValue
}
func updateTableViewCell(_ sender: AllCountersTableViewCell) {
allCountersTableView.reloadData()
}
In cellForRow you must set cell.delegate = self for this logic to start working. Its not enough just to make you controller confroms to your custom cell delegate protocol. From your post I assume delegate is always nil in the cell, that is why it does not work.
My custom cell has a button that when clicked, the user can be taken to another ViewControler. That button has a titleLabel with the String of a user id. What I want to do is take the user to a new UIViewController, passing that clicked buttons's titleLabel (user id) to a variable on the new View Controller. That way, I can use that variable (user id) get further information from firebase and display it on the UI View controller.
on the .xib of the custom cell, I print the UID to make sure each button prints with the correspondent ID, which it does. I can't figure out a way to pass that ID to a new ViewController.
I tried researching online and I found out you can't do prepare(for segue) or performsegue(WithIdentifier) on a customCell.xib.
I tried doing delegates and then protocols but still couldn't get it to work. I am new with Swift. Any help would be great, thank you!
This is the customCell.Xib's Swift file:
class CustomCellTableViewCell: UITableViewCell {
#IBOutlet weak var postImage: UIImageView!
#IBOutlet weak var nameLbl: UILabel!
#IBOutlet weak var descriptionLbl: UITextView!
#IBOutlet weak var profileImageBtn: UIButton!
#IBOutlet weak var profileImage: UIImageView!
#IBOutlet weak var view: UIView!
var btnSelected : Bool = false
var vcInstance: ProfilesTableVC?
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
view.clipsToBounds = true
view.layer.cornerRadius = view.frame.size.width / 2
profileImage.layer.cornerRadius = profileImage.frame.size.width / 2
descriptionLbl.alpha = 0.7
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
#IBAction func profileBtnPressed(_ sender: Any) {
let passValue = UserProfileVC()
let profileTvC = ProfilesTableVC()
print (profileImageBtn.titleLabel!.text!)
var id = (profileImageBtn.titleLabel!.text!)
profileTvC.didSelectProfileBtn(senderID: id)
}
This is the tableViewController, where I everything gets loaded (not where I want to pass the value). I tried passing the value here and then do a prepareForSegue to pass the value to the new UIViewController but the value becomes nil after the segue happens. I am just including code where the .xib call the function from the table view.
class ProfilesTableVC: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate,UINavigationControllerDelegate, UIImagePickerControllerDelegate{
let cell = CustomCellTableViewCell()
func didSelectProfileBtn(senderID: String) {
senderIDArray.append(senderID)
var index = senderIDArray.count - 1
selectedCellUserID = senderIDArray[index]
performSegue(withIdentifier: "showSendersProfile", sender: Any?.self)
}
This is the UIViewController where I want to pass the variable and display further information from Firebase using that ID
import UIKit
import Firebase
class UserProfileVC: UIViewController {
let customCell = CustomCellTableViewCell()
let profileTvC = ProfilesTableVC()
#IBOutlet weak var profileImage: UIImageView!
#IBOutlet weak var nameLbl: UILabel!
var delegate : Any?
var getName = String()
var getsenderID = String()
let userDataRef = Database.database().reference().child("Users")
override func viewDidLoad() {
super.viewDidLoad()
print("ID is: \(profileTvC.selectedCellUserID)")
let sender = getsenderID
print(sender)
}
}
If you don't want to use protocols, you can addTarget to the button in the tableView - cellForRowAt method, also in that method you set the tag to the row index value.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let profileCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier) as! MoviewReviewCell
reviewCell.profileImageBtn.tag = indexPath.row
reviewCell.profileImageBtn.addTarget(self, action: #selector(tappedOnXibCellButton), for: .touchUpInside)
return reviewCell
}
#objc func tappedOnXibCellButton(sender: UIButton) {
print(sender.tag)
performSegue(withIdentifier: reviewListToDetails, sender: sender.tag)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let identifier = segue.identifier
if identifier == "segueName" {
let destViewController = segue.destination as! DestinationClassViewController
let selectedIndex = sender as! Int
let profileId = profilesList[selectedIndex].id
destViewController.profileId = profileId
}
}
You seem to create a NEW ProfilesTableVC, and try to perform the segue on. The newly created one is not on your view stack, and not from your storyboard.
You could add this while returned cellForRowAt (at the ProfilesTableVC of course):
cell.vcInstance = self
Then in the button click
#IBAction func profileBtnPressed(_ sender: Any) {
print (profileImageBtn.titleLabel!.text!)
var id = (profileImageBtn.titleLabel!.text!)
vcInstance?.didSelectProfileBtn(senderID: id)
}
You can do it with protocols/delegates. I think you tried but there is something wrong with your trial.
Define a callback delegate:
protocol CustomCellDelegate: AnyObject {
func customCell(didSelectButton name: String)
}
You will notice extending AnyObject. This is to allow weak references, try to read about Swift ARC
Then, in your cell:
weak var delegate: CustomCellDelegate?
Then in the profileBtnPressed(_ sender: Any)
#IBAction func profileBtnPressed(_ sender: Any) {
var id = (profileImageBtn.titleLabel!.text!)
delegate?.customCell(didSelectButton: id)
}
When dequeing the cell:
(cell as? CustomCellTableViewCell)?.delegate = self
I have a custom cell class which contains a slider which I would like to use to save an integer value (stored as a string). The value of the slider is saved to a global variable in the custom cell, and a save function in the viewController is supposed to save that value. However, it doesn't save the updated value. (I recognize that saving to a global variable and then using that global variable in a different view isn't a good idea, but I did not know how to pass the info... I have used prepareForSegue for other scenarios but there is no segue here... the slider is in a cell in the viewController). Here is the code:
var moneyValue: Int = Int()
var moneyAmount: String = String()
class CustomCell: UITableViewCell, UITextFieldDelegate {
#IBOutlet weak var moneySlider: UISlider!
#IBAction func sliderValueChanged(_ sender: UISlider) {
moneyValue = Int(sender.value)
moneyLabel.text = String(moneyValue)
moneyAmount = moneyLabel.text!
}
}//there is an initializer (not posted) that sets the original value to 0
Here is the overall viewController code:
class CreateVC: UIViewController, UITableViewDelegate, UITableViewDataSource, CustomCellDelegate, UITextFieldDelegate, UITextViewDelegate {
#IBAction func saveButtonTapped(_ sender: UIBarButtonItem) {
//save moneyAmount to DB
}
}
The saving to the DB is very simple, but a value of "0" is always the value saved, regardless of the slider's position. "0" is the initial position of the slider, so I think that the problem is that the slider's updated value isn't being saved to the variable somehow. 1. How do I fix this and/or 2. what is the appropriate way to pass this information if the current set up isn't ideal?
I had edited this answer, according to the comments.
Define a protocol in cell.swift
protocol CellDelegate : class
{
func cellDelegate(moneyValue: Int) -> Void
}
extension CellDelegate
{
func cellDelegate(moneyValue: Int) -> Void {}
}
class CustomCell: UITableViewCell, UITextFieldDelegate
{
weak var delegate: CellDelegate?
var moneyValue: Int = Int()
var moneyAmount: String = String()
#IBOutlet weak var moneySlider: UISlider!
#IBAction func sliderValueChanged(_ sender: UISlider)
{
moneyValue = Int(sender.value)
moneyLabel.text = String(moneyValue)
moneyAmount = moneyLabel.text!
if delegate != nil {
delegate?.cellDelegate(moneyValue: moneyValue)
}
}
}
then, implement this protocol in viewcontroller.swift. The value will be passed from cell to view controller.
class CreateVC: UIViewController, CellDelegate
{
func cellDelegate(moneyValue: Int)
{
...
}
}
class CustomCell: UITableViewCell, UITextFieldDelegate {
var moneyValue: Int = Int()
var moneyAmount: String = String()
#IBOutlet weak var moneySlider: UISlider!
#IBAction func sliderValueChanged(_ sender: UISlider) {
moneyValue = Int(sender.value)
moneyLabel.text = String(moneyValue)
moneyAmount = moneyLabel.text!
}
// create action of 'button save' in your custom cell, whenever you clicked on button you get all the values of components here and save your values in your DB
// Now, you don't need to declare global variables,
#IBAction func saveButtonTapped(_ sender: UIBarButtonItem) {
//save moneyAmount to DB
}
}
If you'r going to use your custom cell in multiple UIViewController then above method fails. Then do as below:
Use delegate and protocol enter link description here
Closures (Block callback) enter link description here