I'm trying to read data from CoreData into a custom cell. This is just a test app before I try moving to the real app that I've been working on. The data is there - I can print it to the console and see it. For some reason, even with constraints, all of the data is laid on top of each other in the cell. Can anyone see what's going on with this?
I've created constraints to keep the cells where they should be, but when the data is loaded from my 'show data' button, the data is laid on top of each other.
Here is my custom cell class:
import UIKit
class CustomCellClass: UITableViewCell {
#IBOutlet weak var txtNameLabel: UILabel!
#IBOutlet weak var txtAgeLabel: UILabel!
}
Here is the ShowData class: (partial)
class ShowData: UIViewController, NSFetchedResultsControllerDelegate {
#IBOutlet weak var personTableView: UITableView!
let appDelegate = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
var personData = [Person]()
// Read the data
override func viewDidLoad() {
super.viewDidLoad()
personTableView.delegate = self
personTableView.dataSource = self
loadItems()
}
func loadItems() {
let request : NSFetchRequest<Person> = Person.fetchRequest()
do {
personData = try appDelegate.fetch(request)
} catch {
print("couldn't load")
}
}
}
extension ShowData : UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return personData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let person = personData[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "personNameAge", for: indexPath) as! CustomCellClass
cell.txtNameLabel?.text = person.name
cell.txtAgeLabel?.text = String(person.age)
return cell
}
Here is a screenshot of the tableview while running:
Edit:
I just deleted the app from the simulator and tried to rerun - now there isn't any data in the cells.
Just to clarify for other readers, as can be seen in your screenshot, the rows in your table are separated as expected but the different fields in each cell, what one might call the columns, are on top of one another.
You say that you have created constraints to keep the cells where they should be, I'm not sure what you mean by that. What you need is constraints for the fields within each cell – what I call intra-cell constraints. Either you have not added these constraints, or there is a mistake in them which causes all fields to be drawn at the left.
To show you what I mean, let's use the example of a little workout app of mine which has, in each table cell, from left to right, a Perform button, an Edit button, a Name field and a Duration field. The screenshot below shows, in the big yellow box, the intra-cell constraints. If you are using a storyboard, the problem with your app must be in that area. If you are not using a storyboard, the problem must be in the equivalent code (or lack of it).
Just to let everyone know. The issue is resolved. I removed the table view cell from the project, readded, and readded the constraints. Everything is working now. I'm not sure where the problem was, but I noticed I had weird wrapping happening. I moved one of the labels to the other side of the cell and constrained it to the right side, and the other to the left side. When I ran the app, the text appeared to word wrap. I decided to delete the cell and readd and relink my outlets. It worked the first time...
Related
That is my footerView called FooterTableViewCell. I have this protocol called SurveyAnswerTableViewCellDelegate. It's parent is AddQuestionViewController.
When I tap on the footerView I trigger #IBActtion.
#objc protocol SurveyAnswerTableViewCellDelegate: AnyObject {
func textSaved(_ text: String)
}
class FooterTableViewCell: UITableViewHeaderFooterView {
var parentVC: AddQuestionViewController!
#IBAction func addNewTapped(_ sender: Any) {
print("tapped")
let newTag = model.tag + 1
parentVC.addNewAnswer()
}
This button action triggers AddQuestionViewController
class AddQuestionViewController: SurveyAnswerViewDelegate, UITextFieldDelegate, UITableViewDelegate, SurveyAnswerTableViewCellDelegate {
var answers: [SurveyAnswerModel] = []
var savedText : String = ""
static var delegate: SurveyAnswerTableViewCellDelegate?
I try creating an empty string and append a new answer to my array. But this text here is always "".
func addNewAnswer() {
let newAnswer = SurveyAnswerModel(answer: savedText, tag: 0)
self.answers.append(newAnswer)
self.tableView.reloadData()
}
func textSaved(_ text: String) {
savedText = text
}
The textfield I try to read is inside SurveyAnswerTableViewCell while setting up the cell inside the tableview I call setup function.
class SurveyAnswerTableViewCell: UITableViewCell {
#IBOutlet weak var textField: UITextField!
weak var delegate: SurveyAnswerTableViewCellDelegate?
var parentVC: AddQuestionViewController!
func setup() {
if let text = self.textField.text {
self.delegate?.textSaved(textField.text!)
}
}
extension AddQuestionViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(forIndexPath: indexPath) as SurveyAnswerTableViewCell
cell.parentVC = self
cell.setup()
return cell
}
How can I successfully send that text to AddQuestionViewController so it appends a new answer with correct string
There are a few things keeping this from working.
You are calling SurveyAnswerTableViewCell's setup() function directly after dequeuing the cell for reuse. It has not yet (re)appeared on the screen at that point, so the user has not had a chance to enter anything into the text field.
You don't currently set the delegate property of SurveyAnswerTableViewCell to anything, so even if the textfield had valid input, the delegate would be nil and delegate?.textSaved(textField.text!) wouldn't do anything.
Both of the previous points mean that the value of AddQuestionViewController .savedText never gets updated from the empty string. So when addNewAnswer() tries to read it, it will always see that empty string.
Rather than reading the text field when the cell is dequeued, it would make more sense to save the text field value when the user is done typing.
To do that, conform the cell to UITextFieldDelegate and implement the textFieldDidEndEditing(_:) method. From within that method you can then call the delegate method you already have to save the text. Make sure the delegate property on the cell has been set by the VC, or else this won't do anything!
The VC itself should not have a delegate property of type SurveyAnswerTableViewCellDelegate. It serves as the delegate, rather than having one. If this doesn't quite make sense, I would recommend reviewing some online resources on the delegate pattern.
So make sure the ViewController conforms to SurveyAnswerTableViewCellDelegate and then set the cell's delegate value to the VC. The cellForRowAt function should then look something like this:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(forIndexPath: indexPath) as SurveyAnswerTableViewCell
cell.delegate = self
return cell
}
As a side note, neither the footer nor the cell should have a reference to the parent view controller. as a general rule it is good to avoid subviews being aware of their parent views. Things get unnecessarily complicated when there is two-way knowledge sharing between components, and it makes the subview much less reusable. I would recommend making a delegate for the footer as well, and removing the parentVC property from both the footer and the cell.
Here's what it looks like is happening:
Button tapped
addNewTapped(_:) invoked
addNewAnswer() invoked
newAnswer is appended to answers
tableView.reloadData() invoked
Cells are regenerated with new/empty textfields (so delegate.textSaved is never invoked)
so I'm not sure what you're trying to do, but here's what I figure are a couple possible routes:
store UITextFields separately and add them into table cells so they're not removed by a table reload
conform AddQuestionViewController to UITextFieldDelegate and set it as the textfields' delegate to observe textfield texts changing (and if you're only using 1 textfield, you could set savedText there)
I'm making a chess app for swift with a chat function. I upload my messages to firebase firestore and then, download them into a [Message] array and display them in a UITableView.
I've been looking around for this on stackoverflow and found that several people are having trouble with sizes of a custom UITableViewCell. I've run into the same problem, but in my case the width of the cell seems to randomly change every time I call .reloadData(). To illustrate :
The first 2 times or so when I type something in my chat it should look like this (the cells in the circle)
But as you can see after a few times this happens :
My code :
Custom cell class
class MessageCustomCell: UITableViewCell {
#IBOutlet weak var dateLabel: UILabel!
#IBOutlet weak var bgView: UIView!
#IBOutlet weak var leftImage: UIImageView!
#IBOutlet weak var messageBubble: UIView!
#IBOutlet weak var messageLabel: UILabel!
#IBOutlet weak var rightImage: UIImageView!
override func awakeFromNib() {
super.awakeFromNib()
messageLabel.numberOfLines = 0
messageBubble.layer.cornerRadius = 5
}
}
TableView delegate methods (TableView = messageView)
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return allMessages.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = messageView.dequeueReusableCell(withIdentifier: "MessageCustomCell") as! MessageCustomCell
//cell.width = tableView.frame.width
let msg = allMessages[indexPath.row]
//cell.frame.size.width = messageView.frame.width
//cell.contentView.frame.size.width = messageView.frame.width
let date = msg.time
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "d/M/yy, h:mm"
let realDate = dateFormatter.string(from: date)
print(msg.fromUserName!)
if msg.fromUserName! == currentUserName {
cell.messageBubble.backgroundColor = UIColor(named: "lightSquare")
cell.messageLabel.textColor = .black
cell.rightImage.isHidden = true
} else {
cell.messageBubble.backgroundColor = UIColor(named: "darkSquare")
cell.messageLabel.textColor = .white
cell.leftImage.isHidden = true
}
cell.dateLabel.text = realDate
cell.messageLabel.text = msg.text!
return cell
}
In my MessageCustomcell.xib file I have a few constraints :
I've put the leftImage, messageBubble (UIView), rightImage in a horizontal stackview. The images have only width and height constraints. The label in the messageBubble has constraints to its superview (top,bottom,trailing,leading)
The stackView has constraints to the bgView (UIView), also top bottom trailing and leading.
Same for the bgView to the safe area.
I've tried setting the frame for the custom cell, but that didn't seem to work, so I've commented that out.
Really hope someone can help me out. If you guys need more info then please do let me know :)
Thanks all.
EDIT :
Here are my constraints for the custom cell xib file.
Alright thanks to #SPatel, who pointed out to make 2 separate .xib files for the receiver chat bubble and the sender chat bubble. This actually worked for my situation and was the right way to go in the first place, instead of manipulating one custom cell for both sender and receiver.
I'm thinking the constraint issue had to do with me trying to hide either the right image or the left image, to change the custom cell appearance for both sides. That must have messed up the whole constraints situation for the custom cell.
Anyway, happy man. Moving on!
I am unable to populate a swift cell-based tableview in macOS 10.14.6 using an Xcode 11.2 xib. The app is Document based and the tableView is created with a separate WindowController xib. A similar project created programmatically in Xcode works ok, including drag and drop; I am relatively new to using xibs and likely have not set things correctly. A column identifier has been set in the xib and NSTableViewDataSource and NSTableViewDelegate have been added to the Window Controller. Pertinent source code follows and the complete Xcode project may be downloaded here: https://www.dropbox.com/s/6tsb98b7iihhfxl/tableView.zip?dl=0
Any help in getting the tableView populated with a String array would be appreciated. I would also like to get drag and drop working but can get by for now just getting the array items to show up in the table view. It correctly creates four rows, corresponding to the number of elements in the array, but there is no visible text. The tableView is cell-based, but I could use view-based if that would work better. Thank you in advance.
class WindowController: NSWindowController, NSTableViewDataSource, NSTableViewDelegate {
#IBOutlet var tableView: NSTableView!
var sports : [String] = ["Basketball","Baseball","Football","Tennis"]
override func windowDidLoad() {
super.windowDidLoad()
tableView.registerForDraggedTypes([NSPasteboard.PasteboardType.fileURL])
tableView.dataSource = self
tableView.delegate = self
}
func numberOfRows(in tableView: NSTableView) -> Int {
return (sports.count)
}
func tableView(_ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int) -> Any? {
var value : Any? = 0
let columnIdentifier : String = (tableColumn?.identifier.rawValue)!
if (columnIdentifier == "Col1"){
value = sports[row]
}
return value
}
In Document.swift windowController is released at the end of showTableView() and the table view looses its data source. Add windowController to the window controllers of the document or hold a strong reference to windowController.
#IBAction func showTableView(_ sender: Any) {
let windowController = WindowController.init(windowNibName:NSNib.Name("WindowController"))
addWindowController(windowController)
windowController.showWindow(nil)
}
I am trying to figure out how to get textfield data from cells in a tableview in an ordered fashion. So far I am able to type into each textfield a retrieve the type data. To do so in the correct order though the user must edit the first cell...last cell, any other way and the data isn't in the correct order.
For Example:
I have the program create 5 cells with a textfield,
textfield1: I typed here second
textfield2: I typed here fourth
textfield3: I typed here first
textfield4: I typed here fifth
textfield5: I typed here third
the way I currently have it my dataArray would look identical to this one, because it is being stored based on when it is typed in and not the order of the cells.
I would like to type the above example, but my data come out like this:
textfield1: I typed here first
textfield2: I typed here second
textfield3: I typed here third
textfield4: I typed here fourth
textfield5: I typed here fifth
Here is my textfield editing code:
#IBAction func TitleEditBegin(_ sender: UITextField) {
}
#IBAction func TitleEditEnd(_ sender: UITextField) {
print(sender.tag) // Debug
titleArray.append(sender.text!)
}
I know for the time being that any other changes will be appended to the titleArray, but I want to solve the ordering issue first.
Thanks!
EDIT: I forgot to add in how I am creating the cells, the code is below:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = TitleSessionTableView.dequeueReusableCell(withIdentifier: textCellIdentifier, for: indexPath) as! TitleSessionCell
cell.SessionTitleLabel.text = "Title"
// cell.SessionTitleField.text = "Default"
cell.SessionTitleField.tag = indexPath.row
cell.SessionTitleField.delegate = self
print(indexPath.row) // Debug
return cell
}
EDIT 2: Adding where I define the text fields.
import Foundation
import UIKit
class TitleSessionCell: UITableViewCell{
#IBOutlet weak var SessionTitleField: UITextField!
#IBOutlet weak var SessionTitleLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
}
The easiest way would be to use a dictionary I believe. I would assign all of the textFields a different tag. So for textField1 you would say textField1.tag = 1. I don't see the creation of your text fields, so it is hard to show the best way of adding that in, but then after handling that, I would create the dictionary as a class variable.
var textFieldDictionary: [Int: String] = [:]
and then add in the text to it like so:
if sender.text != nil && sender.text != "" {
textFieldDictionary[sender.tag] = sender.text
}
then when you want to retrieve the information, do something like this:
for i in 0..<biggestTextFieldNumber {
if let text = textFieldDictionary[i] {
//do something with text
print(text)
}
}
or you could just grab the specific number values out whenever you needed them by using:
textFieldDictionary[numberYouWant]
I hope this helps!
Hello fellow programmers! I have a challenge I need help with. I have built a table using a Custom Style Cell.
This cell simply has a Label and UISwitch. The label displays a name and the switch displays whether they are an Admin or not. This works perfectly. My challenge is how and where do I put code to react when the switch is changed.
So if I click the switch to change it from off to on where can I get it to print the persons name? If I can get the name to print I can do the php/sql code myself. Thanks and here is a snippet from my code.
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: UITableViewCell = tableView.dequeueReusableCellWithIdentifier(kCellIdentifier) as UITableViewCell
let admin = self.admin[indexPath.row]
let text1a = admin.FirstName
let text1aa = " "
let text1b = admin.LastName
let text1 = text1a + text1aa + text1b
(cell.contentView.viewWithTag(1) as UILabel).text = text1
if admin.admin == "yes" {
(cell.contentView.viewWithTag(2) as UISwitch).setOn(true, animated:true)
} else if admin.admin == "no" {
(cell.contentView.viewWithTag(2) as UISwitch).setOn(false, animated:true)
}
return cell
}
You have to set an action in your Custom Table View Cell to handle the change in your UISwitch and react to changes in it, see the following code :
class CustomTableViewCell: UITableViewCell {
#IBOutlet weak var label: UILabel!
#IBAction func statusChanged(sender: UISwitch) {
self.label.text = sender.on ? "On" : "Off"
}
}
The above example is just used to change the text of the UILabel regarding the state of the UISwitch, you have to change it in base your requirements of course. I hope this help you.
You need to listen .ValueChanged of UISwitch, in YOUR_CUSTOM_CELL to make some decisions. There you can catch to "println" your data.
Eric,
At some point in the tableview's lifecycle, you'll need to configure each UISwitch in the table cell with a target/action.
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIControl_Class/index.html#//apple_ref/occ/instm/UIControl/addTarget:action:forControlEvents:
The action tells the UISwitch instance what method it should invoke when the switch is flipped by the user. The target tells the UISwitch instance what object is hosting that method.
Typically, you'll use the UITableViewController (or UIViewController) subclass as the target.