I got the UITableViewCell, but cell's elements are nil. Why? - uitableview

The following code is a cleansed & rehashed version of a previous post.
ref: This class is not key value coding-compliant for the key...why?
import Foundation
import UIKit
var x = 1
struct DiaryItem {
var title:String?
var subTitle:String?
var leftImage:UIImage?
var rightImage:UIImage?
init(title:String, subTitle:String) {
self.title = title
self.subTitle = subTitle
}
}
class DiaryTableViewCell: UITableViewCell {
#IBOutlet weak var TitleLabel: UILabel!
#IBOutlet weak var SubTitleLabel: UILabel!
#IBOutlet weak var leftImageView: UIImageView!
#IBOutlet weak var rightImageView: UIImageView!
}
class DiaryTableViewController: UITableViewController {
let kCellIdentifier = "DiaryCell"
var diaryCell:DiaryTableViewCell?
var objects = NSMutableArray() //...global var.
override func viewDidLoad() {
self.title = "My Diary"
tableView.registerClass(DiaryTableViewCell.self, forCellReuseIdentifier: kCellIdentifier)
}
// -----------------------------------------------------------------------------------------------------
// MARK: - UITableViewDelegate
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let controller = gStoryboard.instantiateViewControllerWithIdentifier("DiaryPlayerVC") as DiaryPlayerViewController
self.navigationController?.pushViewController(controller, animated: true)
}
// -----------------------------------------------------------------------------------------------------
// MARK: - UITableViewDataSource
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
// -----------------------------------------------------------------------------------------------------
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 2
}
// -----------------------------------------------------------------------------------------------------
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(kCellIdentifier) as DiaryTableViewCell?
// cell?.selectionStyle = .None
println("\(x++)) Inside cell")
cell!.TitleLabel?.text = "Hello"
cell!.TitleLabel?.backgroundColor = UIColor.blueColor()
cell!.SubTitleLabel?.text = "World"
cell!.contentView.backgroundColor = UIColor.redColor()
return cell!
}
...
}
I'm getting the cell, but no elements of that cell.
1) Inside cell
(lldb) po cell!.TitleLabel
nil
I cleaned up the code, it compiles & runs okay. The cell is loaded and painted with red so I can see it was loaded. But none of the cell's contents are instantiated.
why?
It's seeing the members of the cell now...
But now I'm getting:
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSObject 0x7f9691594810> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key leftImageView.'
If I disconnect the outlets, I get the images:
I've added the required init() but still have the same problem:
class DiaryTableViewCell: UITableViewCell {
#IBOutlet weak var leftImageView: UIImageView!
#IBOutlet weak var rightImageView: UIImageView!
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var subTitleLabel: UILabel!
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
NSLog("init coder")
}
}

You have declared your properties as implicitly unwrapped optionals, signing that your are sure they are not nil. Thus there is no need to use optional chaining.
And please use lower case property names because upper case names are used for class names:
class DiaryTableViewCell: UITableViewCell {
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var subTitleLabel: UILabel!
#IBOutlet weak var leftImageView: UIImageView!
#IBOutlet weak var rightImageView: UIImageView!
}
Then try this:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCellWithIdentifier(kCellIdentifier) as? DiaryTableViewCell {
// cell.selectionStyle = .None
println("\(x++)) Inside cell")
cell.titleLabel.text = "Hello"
cell.titleLabel.backgroundColor = UIColor.blueColor()
cell.subTitleLabel.text = "World"
cell.contentView.backgroundColor = UIColor.redColor()
return cell
}
return UITableViewCell()
}
If that crashes there must be something wrong with your outlet bindings.
Did you set your DiaryTableViewCell as the class for the nib in InterfaceBuilder?

Your tableCellClass lacks the awakeFromNib()method for nib:
class DiaryTableViewCell: UITableViewCell {
#IBOutlet weak var TitleLabel: UILabel!
#IBOutlet weak var SubTitleLabel: UILabel!
#IBOutlet weak var leftImageView: UIImageView!
#IBOutlet weak var rightImageView: UIImageView!
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
}
}

I found the solution:
This class is not key value coding-compliant for the key...why?
Here's the repost:
I had linked the UI elements to the WRONG source:
Here's the result:

Related

How to implement event on click in button inside in a tableView to show other element?

I have a tableView with action buttons, one of them are hide until the user click the other button, I was looking how to do that and I found that I have to implement a delegate like the code below:
Class TableViewCell:
import UIKit
import FLAnimatedImage
protocol OnButtonsClickDelegate:AnyObject{
func onBtnDownloadClick(cell: ListadoTableViewCell)
}
class ListadoTableViewCell: UITableViewCell {
#IBOutlet weak var lblAnterior: UILabel!
#IBOutlet weak var lblCompras: UILabel!
#IBOutlet weak var lblDevolucion: UILabel!
#IBOutlet weak var lblSaldo: UILabel!
#IBOutlet weak var lblAbonos: UILabel!
#IBOutlet weak var lblNuevo: UILabel!
#IBOutlet weak var lblDiferido: UILabel!
#IBOutlet weak var lblCliente: UILabel!
#IBOutlet weak var lblNombreCliente: UILabel!
#IBOutlet weak var spinner: FLAnimatedImageView!
#IBOutlet weak var btnDowload: UIButton!
#IBOutlet weak var btnShare: UIButton!
var onButtonsClickDelegate : OnButtonsClickDelegate!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
#IBAction func onBtnDownloadClick(_ sender: AnyObject){
onButtonsClickDelegate.onBtnDownloadClick(cell: self)
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
Class Controller:
class ListadoController: NavigationViewController, UITableViewDelegate, UITableViewDataSource, RefreshScrollViewDelegate,OnButtonsClickDelegate {
#IBOutlet weak var tableView: RefreshTableView!
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellListado") as! ListadoTableViewCell
let r = data[indexPath.row]
let compras = Functions.stringToFloat(str: r.compras)
let comprasn = Functions.stringToFloat(str: r.comprasn)
let abonos = Functions.stringToFloat(str: r.abonos)
let diferido = Functions.stringToFloat(str: r.diferido)
let saldomov = Functions.stringToFloat(str: r.saldomov)
cell.lblAnterior.text = Functions.moneyFormat(n: saldomov - compras - comprasn)
cell.lblCompras.text = Functions.moneyFormat(n: compras)
cell.lblDevolucion.text = Functions.moneyFormat(n: 0.0)
cell.lblSaldo.text = Functions.moneyFormat(n: saldomov - comprasn)
cell.lblAbonos.text = Functions.moneyFormat(n: abonos) + ""
cell.lblNuevo.text = Functions.moneyFormat(n: saldomov - comprasn - abonos) + ""
cell.lblDiferido.text = Functions.moneyFormat(n: diferido) + ""
cell.lblCliente.text = r.nombre.capitalized
cell.lblNombreCliente.text = r.cvecte
cell.onButtonsClickDelegate = self
if indexPath.row == data.count - 1 {
if (!last && !loading) {
loadData(page: currentPage)
}
}
return cell
}
func onBtnDownloadClick(cell: ListadoTableViewCell) {
cell.btnShare.isHidden = false
}
}
The problem is that it does not work correctly. When the user clicks the button, the other element is displayed but not only in the selected row, but also in other rows as well, how can I solve this problem?
The cell is being re-used and whatever is the state of that cell will still be there, in which case, try adding this to ListadoTableViewCell:
override func prepareForReuse() {
super.prepareForReuse()
btnShare.isHidden = true
}
You should try to save the state of the cell when you press the download button so that when the reloadData of the TableView is performed and the cellForRowAt function is called, the state of the changes in the cells is preserved, in your case the share button is shown if the download button has previously been pressed.
Here there is a project from my Github that make the functionality you need by applying MVVM Pattern https://github.com/JLPenaLopez/MyFiles I hope this helps you
This is a demostration: https://github.com/JLPenaLopez/MyFiles/blob/master/MyFilesGif.gif
I solved using an answer from another post:
Button action in custom UITableViewCell affects other cells
Thank you for your help.

Having trouble connecting my CustomCell.xib to my tableView in the storyboard

I Have to do an app for recipes and it shows me different recipes in my tableView, and i just want to implement my CustomCell (from a xib file) to my storyboard and I don't know how to connect it to show my data (I already checked my identifier) here's the code of my controller :
class SearchRecipe: UIViewController, ShowAlert {
var recipeData = RecipeDataModel()
var recipe = [String]()
#IBOutlet weak var tableViewSearch: UITableView!
override func viewDidLoad() {
self.tableViewSearch.rowHeight = 130
}
func updateRecipeData(json: JSON){
if let ingredients = json["hits"][0]["recipe"]["ingredientLines"].arrayObject{
recipeData.ingredientsOfRecipe = ingredients[0] as! String
recipeData.cookingTime = json["hits"][0]["recipe"]["totalTime"].stringValue
recipeData.recipe = json["hits"][0]["recipe"]["label"].stringValue
recipeData.recipeImage = json["hits"][0]["recipe"]["image"].stringValue
}
else {
print("Problem")
}
//self.tableViewSearch.reloadData()
}
}
extension SearchRecipe: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return recipe.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "customRecipeCell", for: indexPath) as! CustomRecipeCell
getRecipesDisplay(in: cell, from: recipeData , at: indexPath)
return cell
}
func getRecipesDisplay(in cell: CustomRecipeCell, from recipeModel: RecipeDataModel, at indexPath: IndexPath){
cell.recipeTitle.text = recipeData.recipe
cell.recipeInfos.text = recipeData.ingredientsOfRecipe
cell.timerLabel.text = recipeData.cookingTime
}
}
and this is the code my xib file :
class CustomRecipeCell: UITableViewCell {
#IBOutlet weak var recipeTitle: UILabel!
#IBOutlet weak var recipeInfos: UILabel!
#IBOutlet weak var cellImageBackground: UIImageView!
#IBOutlet weak var likeAndTimerView: UIView!
#IBOutlet weak var likeImage: UIImageView!
#IBOutlet weak var timerImage: UIImageView!
#IBOutlet weak var likeLabel: UILabel!
#IBOutlet weak var timerLabel: UILabel!
#IBOutlet weak var activityIndicator: UIActivityIndicatorView!
override func awakeFromNib() {
super.awakeFromNib()
activityIndicator.isHidden = true
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
In ViewDidLoad, you must register your cell this way:
override func viewDidLoad() {
tableViewSearch.register(UINib(nibName:" /* NAME OF YOUR XIB FILE */ ", bundle: nil), forCellReuseIdentifier: "customRecipeCell")
}
You also have to edit the size of your cell in the attribute inspector of your custom cell and of your table view

UITableView with CustomCell not show data Swift4 on Xcode9

I read the other topics, but not solves my problem, I create a tableview and your cells with same value to make tests, but when I execute my project nothing data is showed. I put 5 size of rows to only to test. I don't know why my code not works.
My storyboard:
TableViewCellVenda.swift
class TableViewCellVenda: UITableViewCell {
#IBOutlet weak var cellView: UIView!
#IBOutlet weak var imageCloud: UIImageView!
#IBOutlet weak var labelValorTotal: UILabel!
#IBOutlet weak var labelQtdItens: UILabel!
#IBOutlet weak var labelCliente: UILabel!
#IBOutlet weak var labelDataVenda: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
ViewControllerVendas.swift
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
// UI View
#IBOutlet weak var tableViewVendas: UITableView!
#IBOutlet weak var waitView: UIActivityIndicatorView!
// DB
var db: OpaquePointer?
var count : Int = 0
// Data
var saleOrders : [SaleOrder] = []
override func viewDidLoad() {
super.viewDidLoad()
self.waitView.startAnimating()
self.waitView.hidesWhenStopped = true
tableViewVendas.delegate = self
tableViewVendas.dataSource = self
}
// TableView
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 5
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellVenda") as! TableViewCellVenda
print("Cell for row")
cell.labelCliente.text = "Nome do Cliente"
cell.labelDataVenda.text = "14/02/1991"
cell.labelQtdItens.text = "20"
cell.labelValorTotal.text = "R$ 542,22"
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 75
}
}
Emulator:
Try adding a new swift UIKit file with a class of type UITableView and do all the tableview setup in there. And of coarse set the tables’s class as this UITableView class.

"fatal error" when calling tableView.reloadData(), the tableView is properly connected

I am trying to dynamically update a tableView while the program is running. I believe I have updated the array that the data loads from correctly, but when I press the button that calls self.eventTable.reloadData() I receive the error:
fatal error: unexpectedly found nil while unwrapping an Optional value
Here is the relevant code:
View Controller:
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
//Timer view
#IBOutlet weak var playButton: UIBarButtonItem!;
#IBOutlet weak var pauseButton: UIBarButtonItem!;
#IBOutlet weak var refreshButton: UIBarButtonItem!;
#IBOutlet weak var timerLabel: UILabel!
var counter = 0
var timer = Timer()
var isTimerRunning = false
//testing view container
var viewShowing = 1;
override func viewDidLoad() {
// Do any additional setup after loading the view, typically from a nib.
pauseButton.isEnabled = false
hideAll();
self.basicContainer.isUserInteractionEnabled = true;
self.basicContainer.isHidden = false;
self.timerLabel.text = String("00:00:00");
eventTable.dataSource = self
eventTable.delegate = self
super.viewDidLoad()
loadEvents(event: "timer start")
}
...
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// Add table to keep track of events
#IBOutlet weak var eventTable: UITableView!
var eventData = [Session]()
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return eventData.count;
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellReuseIdentifier") as! eventTableViewCell
let event = eventData[indexPath.row]
cell.eventLabel.text = event.session
return cell
}
private func loadEvents(event: String) {
guard let event1 = Session(session: event) else {
fatalError("Unable to instantiate event")
}
eventData += [event1]
DispatchQueue.main.async() {
self.eventTable.reloadData()
}
}
func testPrint() {
loadEvents(event: "testing cell adding")
//self.eventTable.reloadData()
viewWillAppear(false)
print("This is a test print");
}
}
The function works fine when it is called in ViewDidLoad(), but not when it is called by the button in another class ("This is a test print" prints to console so I know the button call is going through).
Expected behavior is the tableView (eventTable) reloading showing two cells, "timer start" and "testing cell adding" (ideally with "testing cell adding" being at the top).
Also want to emphasize that eventTable is connected to the storyboard, which seems to be a common problem on here.
Here is the Session.swift file and the eventTableViewCell.swift file if those are helpful:
Session.swift
import Foundation
import UIKit
class Session {
//MARK: Properties
var session: String
//MARK: Initialization
init?(session: String) {
guard !session.isEmpty else {
return nil
}
self.session = session
}
}
eventTableViewCell.swift
import Foundation
import UIKit
class eventTableViewCell: UITableViewCell {
//MARK: Properties
#IBOutlet weak var eventLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
Thanks!
Edit: The ViewController from where I call testPrint().
import UIKit
class BasicViewController: UIViewController {
var VC = ViewController();
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//Basic buttons
#IBOutlet weak var warmButton: UIButton!
#IBOutlet weak var dryButton: UIButton!
#IBOutlet weak var stimulateButton: UIButton!
#IBOutlet weak var controlButton: UIButton!
#IBOutlet weak var bedButton: UIButton!
#IBOutlet weak var tempButton: UIButton!
#IBOutlet weak var pulseButton: UIButton!
#IBOutlet weak var ecgButton: UIButton!
#IBOutlet weak var apgarButton: UIButton!
#IBOutlet weak var helpButton: UIButton!
//APGAR options
#IBOutlet weak var skinColor: UIButton!
#IBOutlet weak var pulse: UIButton!
#IBOutlet weak var grimace: UIButton!
#IBOutlet weak var flexion: UIButton!
#IBOutlet weak var respiratoryEffort: UIButton!
#IBAction func warmButton(sender: AnyObject) {
VC.testPrint();
}
}
It would seem that you are all right in stating that I am instantiating a new ViewController which is causing the issue. How should I go about fixing this? Fairly new to Swift
I think, your problem is in this lines of codes:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellReuseIdentifier") as! eventTableViewCell
let event = eventData[indexPath.row]
cell.eventLabel.text = event.session
return cell
}
Can you check the cell identifier is same as your cell identifier
And number of rows in eventData array

Swift -> my prototype cell (UITableViewCell) doesn't show in my UIViewController with a UITableView

My storyboard looks like this
and my code is the following
UIViewController
class DownLoadSoundsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
// MARK: View Controller Properties
let viewName = "DownLoadSoundsViewController"
#IBOutlet weak var visualEffectView: UIVisualEffectView!
#IBOutlet weak var dismissButton: UIButton!
#IBOutlet weak var downloadTableView: UITableView!
// MARK: Properties
var soundPacks = [SoundPack?]() // structure for downloadable sounds
override func viewDidLoad() {
super.viewDidLoad()
downloadTableView.dataSource = self
downloadTableView.delegate = self
downloadTableView.register(DownLoadTableViewCell.self, forCellReuseIdentifier: "cell")
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return numberOfSoundPacks
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let method = "tableView.cellForRowAt"
//if (indexPath as NSIndexPath).section == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "downloadTableViewCell", for: indexPath) as! DownLoadTableViewCell
cell.backgroundColor = UIColor.green
if soundPacks[(indexPath as NSIndexPath).row]?.price == 0 {
cell.soundPackPriceUILabel.text = "FREE"
} else {
cell.soundPackPriceUILabel.text = String(format: "%.2", (soundPacks[(indexPath as NSIndexPath).row]?.price)!)
}
//cell.textLabel?.text = soundPacks[(indexPath as NSIndexPath).row]?.soundPackTitle
cell.soundPackTitleUILabel.text = soundPacks[(indexPath as NSIndexPath).row]?.soundPackTitle
cell.soundPackAuthorUILabel.text = soundPacks[(indexPath as NSIndexPath).row]?.author
cell.soundPackShortDescription.text = soundPacks[(indexPath as NSIndexPath).row]?.shortDescription
cell.soundPackImage.image = UIImage(named: "Placeholder Icon")
DDLogDebug("\(viewName).\(method): table section \((indexPath as NSIndexPath).section) row \((indexPath as NSIndexPath).row))")
return cell
//}
}
UItableViewCell
class DownLoadTableViewCell: UITableViewCell {
#IBOutlet weak var soundPackImage: UIImageView!
#IBOutlet weak var soundPackTitleUILabel: UILabel!
#IBOutlet weak var soundPackAuthorUILabel: UILabel!
#IBOutlet weak var soundPackShortDescription: UILabel!
#IBOutlet weak var soundPackPriceUILabel: UILabel!
let gradientLayer = CAGradientLayer()
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
}
}
But I get the following;
I am sure I am doing something small incorrectly, but as of yet can't figure it out. Looked through many examples included my own code where I have gotten this working before.
Not a single one of my settings for the tableview are getting invoked except the number of cells. But everything in;
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{...}
is not working.
Help is appreciated.
I think you need to reload the tableView after getting data from Firebase
self.saveMixesTableView.reloadData()

Resources