My problem:
I can not communicate properly to the custom cell class with the
table view controler.
I have a button on the cell, I need to write a function and assign
the action of this button in the classroom and not in the class
TableViewController CustomCell.
Here is my code:
CustomCellClass:
class CustomCategoryTableViewCell:UITableViewCell {
#IBOutlet weak var customButton: UIButton!
#IBOutlet weak var title: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
println("Cell is selected.")
}
#IBAction func searchChild(sender: AnyObject) {
println("Tap button ")
}
}
And TableViewController:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellCustom:CustomCategoryTableViewCell = tableView.dequeueReusableCellWithIdentifier("CustomCellCategory") as CustomCategoryTableViewCell
cellCustom.customButton.tag = indexPath.row
cellCustom.title.text = myArray[indexPath.row].nameCategory)
return cellCustom
}
Thanks.
EDIT: I need to write the action in the class TableViewController, because I do TableView.reloadData ()
my nib register:
var nib = UINib(nibName: "CategoryCell", bundle: nil)
tableView.registerNib(nib, forCellReuseIdentifier: "CustomCellCategory")
Check this tutorial
http://www.weheartswift.com/swifting-around/
You need to register nib and also your cellForRowAtIndexPath is wrong...
Related
In my main page, I created a xib file for UITableViewCell. I'm loading the cell from that xib file and its working fine.
Inside of the cell I have some labels and buttons. I'm aiming to change the label by clicking to the button on the cell.
My Code likes below
import UIKit
class SepetCell: UITableViewCell{
#IBOutlet var barcode: UILabel!
#IBOutlet var name: UILabel!
#IBOutlet var fav: UIButton!
#IBOutlet var strep: UIStepper!
#IBOutlet var times: UILabel!
#IBAction func favoriteClicked(sender: UIButton) {
println(sender.tag)
println(times.text)
SepetViewController().favorite(sender.tag)
}
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
}
}
This is my xib files behind codes as .swift.
The codes in the main page likes below:
import UIKit
import CoreData
class SepetViewController: UIViewController, UITextFieldDelegate, UITableViewDataSource, UITableViewDelegate {
#
IBOutlet
var sepetTable: UITableView!
var barcodes: [CART] = []
let managedObjectContext = (UIApplication.sharedApplication().delegate as!AppDelegate).managedObjectContext
override func viewWillAppear(animated: Bool) {
if let moc = self.managedObjectContext {
var nib = UINib(nibName: "SepetTableCell", bundle: nil)
self.sepetTable.registerNib(nib, forCellReuseIdentifier: "productCell")
}
fetchLog()
sepetTable.reloadData()
}
func fetchLog() {
if let moc = self.managedObjectContext {
barcodes = CART.getElements(moc);
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) - > Int {
return self.barcodes.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) - > UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("productCell") as ? SepetCell
if cell == nil {
println("cell nil")
}
let product: CART
product = barcodes[indexPath.row]
cell!.barcode ? .text = product.barcode
cell!.name ? .text = product.name
cell!.fav.tag = indexPath.row
return cell!
}
func favorite(tag: Int) {
}
}
When i clicked fav button inside of the Cell. I wanted to change times label text to anything for example.
When I clicked to the fav button, the event will gone to the SepetCell.swift favoriteClicked(sender: UIButton) function.
So if i try to call:
SepetViewController().favorite(sender.tag)
It will go inside of the
func favorite(tag: Int) {
sepetTable.reloadData()
}
but sepetTable is nil when it is gone there. I think it is because of when I call this SepetViewController().favorite(sender.tag) function. It firstly creates SepetViewController class. So because of object is not setted it is getting null.
How can I reach that sepetTable or what is the best way to solve this issue.
Thanks.
Popular patterns for solving this problem are closures and delegates.
If you want to use closures, you would do something like this:
final class MyCell: UITableViewCell {
var actionBlock: (() -> Void)? = nil
then
#IBAction func didTapButton(sender: UIButton) {
actionBlock?()
}
then in your tableview delegate:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) - > UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MyCellIdentifier") as? MyCell
cell?.actionBlock = {
//Do whatever you want to do when the button is tapped here
}
A popular alternative is to use the delegate pattern:
protocol MyCellDelegate: class {
func didTapButtonInCell(_ cell: MyCell)
}
final class MyCell: UITableViewCell {
weak var delegate: MyCellDelegate?
then
#IBAction func didTapButton(sender: UIButton) {
delegate?.didTapButtonInCell(self)
}
..
Now in your view controller:
then in your tableview delegate:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) - > UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MyCellIdentifier") as? MyCell
cell?.delegate = self
And add conformance to the protocol like this:
extension MyViewController: MyCellDelegate {
didTapButtonInCell(_ cell: MyCell) {
//Do whatever you want to do when the button is tapped here
}
}
Hope this helps!
All patterns above are fine.
my two cents, in case You add by code (for example multiple different cells and so on..)
there is a FAR simple solution.
As buttons allow to specify a "target" You can pass directly the controller AND action to cell/button when setting it.
In controller:
let selector = #selector(self.myBtnAction)
setupCellWith(target: self, selector: selector)
...
in custom cell with button:
final func setupCellWith(target: Any? selector: Selector){
btn.addTarget(target,
action: selector,
for: .touchUpInside)
}
Add target for that button.
button.addTarget(self, action: #selector(connected(sender:)), for: .touchUpInside)
Set tag of that button since you are using it.
button.tag = indexPath.row
Achieve this by subclassing UITableViewCell. button on that cell, connect it via outlet.
To get the tag in the connected function:
#objc func connected(sender: UIButton){
let buttonTag = sender.tag
}
2 am answer: You're over thinking this. Create a custom TableViewCell class; set the prototype cell class to your new custom class; and then create an IBAction.
I have a TableViewCell class like this:
class CampaignsTableViewCell: UITableViewCell {
#IBOutlet weak var activateButton: UIButton!
#IBOutlet weak var titleCampaignPlaceholder: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
setUpButton()
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
private func setUpButton(){
activateButton.backgroundColor = .clear
activateButton.layer.cornerRadius = 5
activateButton.layer.borderWidth = 1
activateButton.layer.borderColor = UIColor.blue.cgColor
}
}
And, in another class which is a ViewController I have my UITableView methods:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let rowNumber = indexPath.row
let cellIdentifier = "CampaignTableViewCell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? CampaignsTableViewCell else {
fatalError("The dequeued cell is not an instance of TableViewCellController.")
}
cell.titleCampaignPlaceholder.text = campaignsArray[rowNumber].campaignName
return cell
}
I need to use my activateButton in my UITableView method in order to access to campaignsArray. I have another method which requieres values from that array, so I need that method is called every time activateButton is pressed from my UITableView.
Any idea ?
Thank you very much
What I like doing in those cases where you have a button inside your UITableViewCell is the following:
Give the cell a closure that is called when tapping on the button like so
class CampaignsTableViewCell: UITableViewCell {
... all your code....
// give your cell a closure that is called when the button is pressed
var onButtonPressed: ((_ sender: UIButton) -> ())?
#IBAction func buttonPressed(sender: UIButton) { // wire that one up in IB
onButtonPressed?(sender)
}
}
and then inside your TableViewController
let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! CampaignsTableViewCell
cell.titleCampaignPlaceholder.text = campaignsArray[rowNumber].campaignName
cell.onButtonPressed = { [weak self] sender in
// Do your magic stuff here
}
return cell
Hope that helps
Your cell will get that event, not tableView. What you need to do is:
Create protocol inside your cell:
protocol CampaignsTableViewProtocol{
func actionButtonPressed(row: Int)
}
class CampaignsTableViewCell: UITableViewCell {
#IBOutlet weak var activateButton: UIButton!
#IBOutlet weak var titleCampaignPlaceholder: UILabel!
// keep info about row
var rowIndex: Int = -1
// create delegate that will let your tableView about action button in particular row
var delegate : CampaignsTableViewProtocol?
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
setUpButton()
self. activateButton.addTarget(self, action: #selector(self.activatePressed), for: UIControlEvents.touchDown)
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
func activatePressed(){
self.delegate?.actionButtonPressed(row :rowIndex)
}
private func setUpButton(){
activateButton.backgroundColor = .clear
activateButton.layer.cornerRadius = 5
activateButton.layer.borderWidth = 1
activateButton.layer.borderColor = UIColor.blue.cgColor
}
}
Your tableViewController needs to adopt this protocol:
class MyTableViewController: UITableViewDelegate, UITableViewDataSource, CampaignsTableViewProtocol {
// rest of the code
}
Also, you will need to implement delegate function in your tableViewController:
func actionButtonPressed(row: Int) {
// get campaign you need
let campaign = campaignsArray[row]
// rest of the code
}
My Tableview is reusing previous cell image data and displaying images from previous cells. I did the following to prevent it from reusing. What am I missing?
#IBAction func cityBtn(_ sender: UIButton) {
for i in stride(from: 0, to: assignCities.count, by: 1)
{ cityName.append(bigCities[i])
cityImages.append(bigCityImages[i])
}}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let myCell= tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CityCell
myCell.myLabel.text = cityName[indexPath.row]
let cityImg = cityImages[indexPath.row]
myCell.myImage.image = nil
if (cityImg != "")
{
myCell.myImage.image = UIImage(named:cityImg)
}
else
{
myCell.myImage.image = nil
}
return myCell
}
import UIKit
class CityCell: UITableViewCell {
#IBOutlet weak var myImage: UIImageView!
#IBOutlet weak var myLabel: UILabel!
override func prepareForReuse() {
super.prepareForReuse()
myImage.image = nil
}
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 did the above but still it is not getting the result
You can implement func prepareForReuse() method of UITableViewCell and reset your cell properties there.
This method is invoked just before the object is returned from the UITableView method dequeueReusableCell(withIdentifier:)
func prepareForReuse() {
super. prepareForReuse()
myImage.image = nil
}
This had to be implemented inside your custom table view cell class.
If there ara not so many cells in your tableView,maybe you can use unique CellIdentifier,such as: indexPath.section_indexPath.row
In my main page, I created a xib file for UITableViewCell. I'm loading the cell from that xib file and its working fine.
Inside of the cell I have some labels and buttons. I'm aiming to change the label by clicking to the button on the cell.
My Code likes below
import UIKit
class SepetCell: UITableViewCell{
#IBOutlet var barcode: UILabel!
#IBOutlet var name: UILabel!
#IBOutlet var fav: UIButton!
#IBOutlet var strep: UIStepper!
#IBOutlet var times: UILabel!
#IBAction func favoriteClicked(sender: UIButton) {
println(sender.tag)
println(times.text)
SepetViewController().favorite(sender.tag)
}
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
}
}
This is my xib files behind codes as .swift.
The codes in the main page likes below:
import UIKit
import CoreData
class SepetViewController: UIViewController, UITextFieldDelegate, UITableViewDataSource, UITableViewDelegate {
#
IBOutlet
var sepetTable: UITableView!
var barcodes: [CART] = []
let managedObjectContext = (UIApplication.sharedApplication().delegate as!AppDelegate).managedObjectContext
override func viewWillAppear(animated: Bool) {
if let moc = self.managedObjectContext {
var nib = UINib(nibName: "SepetTableCell", bundle: nil)
self.sepetTable.registerNib(nib, forCellReuseIdentifier: "productCell")
}
fetchLog()
sepetTable.reloadData()
}
func fetchLog() {
if let moc = self.managedObjectContext {
barcodes = CART.getElements(moc);
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) - > Int {
return self.barcodes.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) - > UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("productCell") as ? SepetCell
if cell == nil {
println("cell nil")
}
let product: CART
product = barcodes[indexPath.row]
cell!.barcode ? .text = product.barcode
cell!.name ? .text = product.name
cell!.fav.tag = indexPath.row
return cell!
}
func favorite(tag: Int) {
}
}
When i clicked fav button inside of the Cell. I wanted to change times label text to anything for example.
When I clicked to the fav button, the event will gone to the SepetCell.swift favoriteClicked(sender: UIButton) function.
So if i try to call:
SepetViewController().favorite(sender.tag)
It will go inside of the
func favorite(tag: Int) {
sepetTable.reloadData()
}
but sepetTable is nil when it is gone there. I think it is because of when I call this SepetViewController().favorite(sender.tag) function. It firstly creates SepetViewController class. So because of object is not setted it is getting null.
How can I reach that sepetTable or what is the best way to solve this issue.
Thanks.
Popular patterns for solving this problem are closures and delegates.
If you want to use closures, you would do something like this:
final class MyCell: UITableViewCell {
var actionBlock: (() -> Void)? = nil
then
#IBAction func didTapButton(sender: UIButton) {
actionBlock?()
}
then in your tableview delegate:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) - > UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MyCellIdentifier") as? MyCell
cell?.actionBlock = {
//Do whatever you want to do when the button is tapped here
}
A popular alternative is to use the delegate pattern:
protocol MyCellDelegate: class {
func didTapButtonInCell(_ cell: MyCell)
}
final class MyCell: UITableViewCell {
weak var delegate: MyCellDelegate?
then
#IBAction func didTapButton(sender: UIButton) {
delegate?.didTapButtonInCell(self)
}
..
Now in your view controller:
then in your tableview delegate:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) - > UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MyCellIdentifier") as? MyCell
cell?.delegate = self
And add conformance to the protocol like this:
extension MyViewController: MyCellDelegate {
didTapButtonInCell(_ cell: MyCell) {
//Do whatever you want to do when the button is tapped here
}
}
Hope this helps!
All patterns above are fine.
my two cents, in case You add by code (for example multiple different cells and so on..)
there is a FAR simple solution.
As buttons allow to specify a "target" You can pass directly the controller AND action to cell/button when setting it.
In controller:
let selector = #selector(self.myBtnAction)
setupCellWith(target: self, selector: selector)
...
in custom cell with button:
final func setupCellWith(target: Any? selector: Selector){
btn.addTarget(target,
action: selector,
for: .touchUpInside)
}
Add target for that button.
button.addTarget(self, action: #selector(connected(sender:)), for: .touchUpInside)
Set tag of that button since you are using it.
button.tag = indexPath.row
Achieve this by subclassing UITableViewCell. button on that cell, connect it via outlet.
To get the tag in the connected function:
#objc func connected(sender: UIButton){
let buttonTag = sender.tag
}
2 am answer: You're over thinking this. Create a custom TableViewCell class; set the prototype cell class to your new custom class; and then create an IBAction.
I have a UITableView (with a Custom class called CellModelAllNames for each row). Each Row has a Label and a button.
My question is: When btn_addRecording (i.e. the '+' button is clicked on any/each of the rows, how do I get the lbl_name.text, the label name shown, and show a pop up in the ViewController itself. I want to get additional information in the pop up and then save all the info (including the lbl_name to a database).
CellModelAllNames for each row layout:
import UIKit
class CellModelAllNames: UITableViewCell {
#IBOutlet weak var lbl_name: UILabel!
#IBOutlet weak var btn_addRecording: UIButton!
#IBAction func btnAction_addRecording(sender: AnyObject) {
println("clicked on button in UITableViewCell")
}
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
func setCell(setBabyName: String) {
self.lbl_name.text = setBabyName
}
}
Here's the code of my ViewController:
import UIKit
class SecondViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tbl_allNames: UITableView!
var arrayOfNames: [Name] = [Name]()
override func viewDidLoad() {
super.viewDidLoad()
self.tbl_allNames.delegate = self
self.tbl_allNames.dataSource = self
self.tbl_allNames.scrollEnabled = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:CellModelAllNames = self.tbl_allNames.dequeueReusableCellWithIdentifier("CellModelAllNames") as! CellModelAllNames
let name = arrayOfNames[indexPath.row]
cell.setCell(name.name)
println("in tableView, cellforRowatIndex, returning new cells")
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arrayOfNames.count
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
}
}
You can use standard UIKit methods to get the cell and its data:
func tappedButton(sender : UIButton) {
let point = sender.convertPoint(CGPointZero, toView: self.tableView)
let indexPath = self.tableView.indexPathForRowAtPoint(point)!
let name = arrayOfNames[indexPath.row]
// do something with name
}
You can add button action in your ViewController
1) In your function cellForRowAtIndexPath assign button's tag as index (ie. indexPath.row)
cell.btn_addRecording.tag = indexPath.row
2) Add target and action for your button :
cell.btn_addRecording.addTarget(self, action: "buttonPressed:", forControlEvents: .TouchUpInside)
3) Add action in ViewControler (ie. save info in database)
func buttonPressed(button: UIButton!)
{
// Add your code here
let name = arrayOfNames[button.tag]
}