I am building a recorder app that users can save their recordings.
How can I change a view of a certain cell in a UITableView to show users that this cell is being played and the cell with the same content in other ViewControllers can be changed simultaneously?
Furthermore, when the audio player finished. The view can be changed back to default.
I have tried override setSelected, but the cell cannot stay selected when I reload the table view and the cell cannot be deselected by itself when audio has finished. I also cannot change the cell with the same content (same audio)' view simultaneously.
Is there a way to overcome this problem?
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
if selected {
print("task has began")
} else if !selected {
print("task has finished")
}
}
The result will be like apple music or podcast that the cell with the same shows across the app will show whether or not it is being played.
First make IBOutlet of View Inside xib
class TableViewCell: UITableViewCell {
#IBOutlet weak var generaV: UIView!
}
set Identifier = TableViewCell
and call the Datasource Method in as many file you want and change the color like .red/.blue in in different VC
Call the Cell in ViewController
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell", for: indexPath) as! TableViewCell
if (audioEnded){
cell.generaV.backgroundColor = UIColor.green
}
else {
cell.generaV.backgroundColor = UIColor.red
}
return cell
}
I have a record button in a custom cell in a UITableView with two images - when you press the button it shows the image for 'stop' record and when you stop record it shows you the image for 'record'. However, when I press the record button the stop image changes on another row in the tableview and not in the button of the cell I have just pushed.
I have tried to make the behaviour of the button consistent by using a delegate protocol method to set up the custom cell. But this has not resolved the issue.
Code for the custom cell (CreateStoryCell) is as follows:
import UIKit
protocol createStoryCellDelegate {
func didRecord(sender: UIButton, storyItem: StoryItem)
}
class CreateStoryCell: UITableViewCell {
#IBOutlet weak var storyCellBackground: UIView!
#IBOutlet weak var storyTextLabel: UILabel!
#IBOutlet weak var record: UIButton!
var storyItem : StoryItem!
var delegate: createStoryCellDelegate?
func setStoryItem(storyPart: StoryItem) {
storyItem = storyPart
storyTextLabel.text = storyItem.text
}
#IBAction func recordTapped(_ sender: UIButton) {
delegate?.didRecord(sender: sender, storyItem: storyItem)
}
}
The extension for the setting up of the cell for tableView is here:
extension CreateStoryViewController : UITableViewDataSource {
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "createStoryCell", for: indexPath) as! CreateStoryCell
let storyItem = storyText?[indexPath.row]
cell.setStoryItem(storyPart: storyItem!)
cell.delegate = self
return cell
}
}
And the didRecord method is here:
extension CreateStoryViewController : createStoryCellDelegate {
func didRecord(sender: UIButton, storyItem: StoryItem) {
if recordToggle == 1 {
sender.setImage(UIImage(named: "recordStop"), for: .normal)
checkRecording(storyItem: storyItem)
audioRecorder.record()
recordToggle = 2
} else {
sender.setImage(UIImage(named: "smallMicBtn"), for: .normal)
audioRecorder.stop()
recordToggle = 1
}
}
}
Please also note that the above delegate method begins to work until I insert the record functionality i.e. as soon as I make active the 'audioRecorder.record()' and 'audioRecorder.stop() lines the button behaviour becomes inconsistent as described above.
Previous, I have tried to implement this by converting the position of the record button to an indexPath with the following:
// let buttonPosition:CGPoint = sender.convert(CGPoint.zero, to: self.createStoryTableView)
// let indexPath = self.createStoryTableView.indexPathForRow(at: buttonPosition)
// let storyItem = self.storyText?[indexPath?.row ?? 0]
But I got the same behaviour.
I'd be grateful for any suggestions on how to resolve. Thanks.
I recommend to introduce a new variable
var isRecording = false in your StoryItem and change its value on start/ stop record button click and reload that particular cell.
In your cellForRowAt use this
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let storyItem = self.storyText?[indexPath?.row ?? 0]
let image = (storyItem. isRecording == true) ? (UIImage(named:"stopImage")) : (UIImage(named: "startImage"))
cell.record.setImage(image, for: .normal)
return cell
}
I want to use a UITableview with different custom tableViewCells. My 3 cells are as such:
Cell1: should have an image and a label.
Cell2: should have two labels.
Cell3: should have a dayPicker.
I don't want to code a tag for the cells. How can I manage this in Swift. Do I have to code my own class for every cell? Can I use one tableviewController? How can I populate data in different cells?
I would like to generate a tableView, like a contact app of an iOS device.
Let me start with answering your questions first.
Do I have to code an own class for every cell?=> Yes, I believe so. At least, I would do that way.
Can I use one tableviewController?=> Yes, you can. However, you can also have a table view inside your View Controller.
How can I populate data in different cells? => Depending on the conditions, you can populate data in different cells. For example, let's assume that you want your first two rows to be like the first type of cells. So, you just create/reuse first type of cells and set it's data. It will be more clear, when I show you the screen shots, I guess.
Let me give you an example with a TableView inside a ViewController. Once you understand the main concept, then you can try and modify anyway you want.
Step 1: Create 3 Custom TableViewCells. I named it, FirstCustomTableViewCell, SecondCustomTableViewCell, ThirdCustomTableViewCell. You should use more meaningful names.
Step 2: Go the Main.storyboard and drag and drop a TableView inside your View Controller. Now, select the table view and go to the identity inspector. Set the "Prototype Cells" to 3. Here, you just told your TableView that you may have 3 different kinds of cells.
Step 3:
Now, select the 1st cell in your TableView and in the identity inspector, put "FirstCustomTableViewCell" in the Custom class field and then set the identifier as "firstCustomCell" in the attribute inspector.
Do the same for all others- Set their Custom Classes as "SecondCustomTableViewCell" and "ThirdCustomTableViewCell" respectively. Also set the identifiers as secondCustomCell and thirdCustomCell consecutively.
Step 4: Edit the Custom Cell Classes and add outlets according to your need. I edited it based on your question.
P.S: You need to put the outlets under the class definition.
So, In the FirstCustomTableViewCell.swift, under the
class FirstCustomTableViewCell: UITableViewCell {
you would put your label and image view outlets.
#IBOutlet weak var myImageView: UIImageView!
#IBOutlet weak var myLabel: UILabel!
and in the SecondCustomTableViewCell.swift, add the two labels like-
import UIKit
class SecondCustomTableViewCell: UITableViewCell {
#IBOutlet weak var myLabel_1: UILabel!
#IBOutlet weak var myLabel_2: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
and the ThirdCustomTableViewCell.swift should look like-
import UIKit
class ThirdCustomTableViewCell: UITableViewCell {
#IBOutlet weak var dayPicker: UIDatePicker!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
Step 5: In your ViewController, create an Outlet for your TableView and set the connection from storyboard. Also, you need to add the UITableViewDelegate and UITableViewDataSource in the class definition as the protocol list.
So, your class definition should look like-
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
After that attach the UITableViewDelegate and UITableViewDatasource of your table view to your controller. At This point your viewController.swift should look like-
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
P.S: If you were to use a TableViewController rather than a TableView inside a ViewController, you could have skipped this step.
Step 6: Drag and drop the image views and labels in your cell according to the Cell class. and then provide connection to their outlets from storyboard.
Step 7: Now, write the UITableViewDatasource's required methods in the view controller.
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "firstCustomCell")
//set the data here
return cell
}
else if indexPath.row == 1 {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "secondCustomCell")
//set the data here
return cell
}
else {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "thirdCustomCell")
//set the data here
return cell
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Swift 3.0 + update with minimum code
Basic concept:
Create a table view with dynamic cell prototypes. Assign identifier and create custom table view cell class for each cell prototype. Initiate and show custom cells in table view's delegate method.
1. Create cells on storyboard
Drag a tableView to your view controller, add prototype cells to it, and then drop UI element to your table view cells, add constraint properly if needed.
2. Create custom UITableViewCell classes
Add the following code to your project. I am putting it right above the view controller class.
class FirstTableCell: UITableViewCell {
}
class SecondTableCell: UITableViewCell {
}
class ThirdTableCell: UITableViewCell {
}
3. Assign custom class and identifier to cell prototypes
For each of the cell prototypes in storyboard, assign the custom class created from step 2, and then enter an unique identifier.
4. Connect UI elements to swift code
Control drag the table view and connect to the view controller class. Control drag the UI elements that get added to cell prototypes on step 1, and connect to the corresponding table view cell class.
5. Add code to view controller and control the table view
Make your view controller conform to table view delegate
class YourViewController: UIViewController, UITableViewDataSource, UITableViewDelegate
In viewDidLoad, set up table view's delegate and data source.
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.dataSource = self
self.tableView.delegate = self
}
Finally, add two delegate methods to control your table view, as per minimum requirement.
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "firstTableCell") as! FirstTableCell
// Set up cell.label
return cell
} else if indexPath.row == 1 {
let cell = tableView.dequeueReusableCell(withIdentifier: "secondTableCell") as! SecondTableCell
// Set up cell.button
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: "thirdTableCell") as! ThirdTableCell
// Set up cell.textField
return cell
}
}
6. Give it a try :)
I recommend to use this simple and easy to use library, I made for Table and Collection views. You can add as many types of cells as you want and achieve more clean ViewControllers without boilerplate code.
https://github.com/deniskakacka/DKDataSources
For UI on first picture, all your code in ViewController is this:
lazy var dataSource = DKTableDataSource<CellType>(
models: [
DisclosureCellModel(title: "Disclosure 1", action: .action1),
TextFieldCellModel(title: "TextField 1", placeholder: "Placeholder 1"),
SwitchCellModel(title: "Switch 1", isOn: true),
BannerCellModel(imageName: "placeholder"),
SwitchCellModel(title: "Switch 2", isOn: false),
BannerCellModel(imageName: "placeholder"),
DisclosureCellModel(title: "Disclosure 2", action: .action2),
TextFieldCellModel(title: "TextField 2", placeholder: "Placeholder 2"),
BannerCellModel(imageName: "placeholder")
]
)
// in `viewDidLoad`
dataSource.registerCells(for: tableView)
tableView.dataSource = dataSource
Swift 5
Create 3 Custom TableViewCells. I named it,
FirstTableViewCell, SecondTableViewCell,
ThirdTableViewCell
Add All 3 Custom Cell Classes and add outlets according to your need.
I have added in below code.
class FirstTableViewCell: UITableViewCell {
#IBOutlet weak var myImageView: UIImageView!
#IBOutlet weak var myLabel: UILabel!
static let cellIdentifier = "FirstTableViewCell"
static let cellNib = UINib(nibName: "FirstTableViewCell", bundle: Bundle.main)
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
}
}
3: In your ViewController, create an Outlet for your TableView. Also, you need to add the UITableViewDelegate and UITableViewDataSource in the class definition.
#IBOutlet weak var tableView: UITableView! {
didSet {
tableView.delegate = self
tableView.dataSource = self
tableView.register(FirstTableViewCell.cellNib, forCellReuseIdentifier: FirstTableViewCell.cellIdentifier)
tableView.register(SecondTableViewCell.cellNib, forCellReuseIdentifier: SecondTableViewCell.cellIdentifier)
tableView.register(ThirdTableViewCell.cellNib, forCellReuseIdentifier: ThirdTableViewCell.cellIdentifier)
}
}
4.Now, write the UITableViewDatasource's required methods in the view controller.
extension ViewController: UITableViewDelegate,UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
guard let cell = tableView.dequeueReusableCell(withIdentifier: FirstTableViewCell.cellIdentifier, for: indexPath) as? FirstTableViewCell else { return UITableViewCell() }
return cell
}else if indexPath.row == 1 {
guard let cell = tableView.dequeueReusableCell(withIdentifier: SecondTableViewCell.cellIdentifier, for: indexPath) as? SecondTableViewCell else { return UITableViewCell() }
return cell
}else {
guard let cell = tableView.dequeueReusableCell(withIdentifier: ThirdTableViewCell.cellIdentifier, for: indexPath) as? ThirdTableViewCell else { return UITableViewCell() }
return cell
}
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50 //According requirement
}
}
Your code will look like below(View Controller Code)
class ViewController: UIViewController {
#IBOutlet weak var tableView: UITableView! {
didSet {
tableView.delegate = self
tableView.dataSource = self
tableView.register(FirstTableViewCell.cellNib, forCellReuseIdentifier: FirstTableViewCell.cellIdentifier)
tableView.register(SecondTableViewCell.cellNib, forCellReuseIdentifier: SecondTableViewCell.cellIdentifier)
tableView.register(ThirdTableViewCell.cellNib, forCellReuseIdentifier: ThirdTableViewCell.cellIdentifier)
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}
extension ViewController: UITableViewDelegate,UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
guard let cell = tableView.dequeueReusableCell(withIdentifier: FirstTableViewCell.cellIdentifier, for: indexPath) as? FirstTableViewCell else { return UITableViewCell() }
return cell
}else if indexPath.row == 1 {
guard let cell = tableView.dequeueReusableCell(withIdentifier: SecondTableViewCell.cellIdentifier, for: indexPath) as? SecondTableViewCell else { return UITableViewCell() }
return cell
}else {
guard let cell = tableView.dequeueReusableCell(withIdentifier: ThirdTableViewCell.cellIdentifier, for: indexPath) as? ThirdTableViewCell else { return UITableViewCell() }
return cell
}
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50 //According requirement
}
}
The above answers are the best answers, but there are TONS of reasons to get this issue. Here is another potential solution for anyone with this problem:
My problem was that I was segueing to the ViewController class and not the storyboard view. So my reference to the storyboard cell was meaningless, since the storyboard wasn't being used.
I was doing this:
let viewControllerB = SubViewController()
viewControllerB.passedData = diseases[indexPath.row].name
navigationController?.pushViewController(viewControllerB, animated: true)
And I needed to do something like this:
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "SubViewStoryboardController") as! SubViewController
nextViewController.passedData = diseases[indexPath.row].name
self.present(nextViewController, animated:true, completion:nil)
Hope this helps someone.
If you're using custom XIBs as TableView Cells then follow the below code
//Write in viewDidLoad()
let nib = UINib(nibName: "PrinterTVC", bundle: nil)
tableView.register(nib, forCellReuseIdentifier: "CELL1")
let nib1 = UINib(nibName: "SelectAndEditTVC", bundle: nil)
tableView.register(nib1, forCellReuseIdentifier: "CELL2")
UITableViewController is inheriting UIViewController that already has UITableviewDataSource & UITableviewDelegate mapped on itself.
You might subclass UITableViewController or use a TableView inside your ViewController.
After that you must implement required methods(cellForRowAtIndexPath and numberOfRowsInSection) which are declared in the UITableviewDataSource.
Also in storyboard, you need to create cell prototypes with unique Id.
There are basic types of cell, with (title, subtitle for instance) - you can use them too if you don't need special configuration.
So, for picker, yes, you need to create your own custom cell. Create necessary custom UITableViewCell class holding date picker and make sure to use delegate to send back the desired result back to your ViewController.
I have a strange issue with my tableView.
I have a List of audio tracks and a segue to an audio player in order to play the selected track at a specific row. Everything works fine!
I wanted to change the background color for the selected row in the table so that, once the user play the audio and come back to the list of tracks (my Table View Controller) , he can see which are the previously selected rows.
But when I run It change me the color not only for the row at index path I selected but also to the item at index path + 10.
If I select the First Row it change me the color for the row at the index: 0, 10, 20, 30...
In order to change the color of the selected cell I did the follow:
// MARK: - Navigation
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("audioPlayer", sender: tableView)
var selectedCell:UITableViewCell = tableView.cellForRowAtIndexPath(indexPath) as CustomTableViewCell
selectedCell.contentView.backgroundColor = UIColor.greenColor()
selectedCell.backgroundColor = UIColor.blueColor()
Please find a screenshot of my issue, I have selected just three rows: 1, 3, 5 but I get selected 1,3,5,11,13,15,21,23 and so on... :
https://www.dropbox.com/s/bhymu6q05l7tex7/problemaCelleColore.PNG?dl=0
For further details - if can help - here it is my Custom Table View class:
import UIKit
class CustomTableViewCell: UITableViewCell {
#IBOutlet weak var artista: UILabel!
#IBOutlet weak var brano: UILabel!
var ascoltato = false
#IBOutlet weak var labelRiproduciAscoltato: UILabel!
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
}
func setCell(artista: String, brano: String){
self.artista.text = artista
self.brano.text = brano
}
} // END MY CUSTOM TABLE VIEW CELL
Here it is the method cellForRowAtIndexPath in my TableViewController:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("tableCell", forIndexPath: indexPath) as CustomTableViewCell
var tracks : Brani //Brani is my custom Object for handle my tracks
cell.setCell(tracks.title!, brano: tracks.author!)
return cell
}
I am running on iPad Air with iOS 7.1.
Thank you in advance for any suggestion or advice related to my issue.
This is probably because UITableViewCells are recycled. This means the formerly selected tableViewCell gets reused by the cells at the lower indexes. This is expected behavior of a UITableView and makes sense, as it saves memory usage. To fix the issue, you will need to have your datasource keep a track of which cell is selected, and updated the cell's background color accordingly.
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("audioPlayer", sender: tableView)
//datasource is updated with selected state
//cell is updated with color change
}
Then in your cellForRowAtIndexPath method:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("tableCell", forIndexPath: indexPath) as CustomTableViewCell
var tracks : Brani //Brani is my custom Object for handle my tracks
cell.setCell(tracks.title!, brano: tracks.author!)
//update cell style here as well (by checking the datasource for selected or not).
return cell
}