I have a subclass, CustomCell, which inherits from my parent class, CreateEvent. The subclass describes different cells for the table view cell, which is on the CreateEvent View controller. In one specific cell, I have a textfield but I am having trouble getting the value from that textfield when a user enters into the textfield. I am also having trouble dismissing the keyboard with outside touches and pressing the return key, but I am primarily focused on getting the text from the textfield. I am familiar with doing these functionalities on a normal swift file but because this is a subclass, I'm not sure what to do. What I've tried is to use:
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
entranceFeeTextField.resignFirstResponder()
return true
}
.. but this does not do the trick.
you need to give UiTextfeld delegate in UITableview Delegate method and your CustomCell looks like
class CustomCell: UITableViewCell {
#IBOutlet var textField: UIImageView!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
and one more thing to implement UITextfield protocol in you view controller.and your controller looks like
class CreateEvent: UIViewController,UITableViewDataSource,UITableViewDelegate,UITextFieldDelegate {
//MARK: - Content TableView Methods
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("CustomCell", forIndexPath: indexPath) as! CustomCell
cell.textField.delegate = self // like delegate
return cell
}
//MARK: - UITextField Methods
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
}
i hope this will help
Related
I have a table view controller with a custom cell which contains a text field - it's a form basically.
i want to automatically go to the next text field when users press "return" on their keyboard but for some reason my solution doesn't work.
In TableViewController, I do:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as? CustomCell
cell?.box.tag = indexPath.row
In my custom table view cell, I have
override func awakeFromNib() {
super.awakeFromNib()
box.delegate = self
...
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if let nextField = textField.superview?.viewWithTag(textField.tag+1) as? UITextField {
nextField.becomeFirstResponder()
} else {
textField.resignFirstResponder()
}
return true
}
The issue is that textField.superview?.viewWithTag(textField.tag+1) is always nil. I don't know why because I clearly set the tag and also mark it as a delegate. thank you.
Adding some clarity and more suggestions to the valid answer by #jawadAli, as I feel you are still new to iOS development.
You are trying to get the tableView from the textField. But you will not get it by referring to the superview of textField. Because the view hierarchy would be like this:
UITableView > UITableViewCell > contentView > Your text field.
There can also be some more views in the view hierarchy, so you need to keep traversing through the superview chain till you get the UITableView. And #jawadAli has posted the code on how to get it.
But overall that is an incorrect approach. You should use delegation. I.e. your cell should call a method when it has resigned as first responder. And your table view controller will receive that call.
Then your view controller has to get the next cell and make it the first responder.
And if this doesn't make any sense to you, then I would very strongly suggest that you learn about Delegation. It's ubiquitous in iOS' libraries.
EDIT:
Approach to use delegation.
Create a protocol, let's say CellDelegate that has a function like func didFinishDataCapture(forCell: UITableViewCell).
The cell will have a delegate property of type CellDelegate.
The controller will conform to CellDelegate and will set itself as the cell's delegate in func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
Now in your cell, when you are done with the text field (which you would know as cell would be the text field's delegate), you call your own delegate's function i.e. delegate.didFinishDataCapture(forCell: self).
In your implementation of didFinishDataCapture in the controller, you will know which cell has finished with the data capture and can put the logic on what to do next.
It should be nil as textField.superview is your cell class ... and your cell class does not have the view with required Tag .. so it will return nil..
import UIKit
extension UIView {
func lookForSuperviewOfType<T: UIView>(type: T.Type) -> T? {
guard let view = self.superview as? T else {
return self.superview?.lookForSuperviewOfType(type: type)
}
return view
}
}
Get tableView through this extension like this
let tableView = self.view.lookForSuperviewOfType(type: UITableView.self)
your function will become
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
let tableView = self.view.lookForSuperviewOfType(type: UITableView.self)
if let cell = tableView?.cellForRow(at: IndexPath(row: textField.tag+1, section: 0)) as? CustomCell {
cell.box.becomeFirstResponder()
} else {
textField.resignFirstResponder()
}
return true
}
I've got a UITableViewController with two custom cells - one contains a UITextField (for the user to input a title) and the other contains a UITextView (for the user to input a description). Whenever these change, I want to update my memory object (which is a struct with two variables - memoryTitle and memoryDescription).
The memoryTitle seems simple enough - on my ViewController I have the following:
#IBAction func memoryTitleChanged(_ sender: UITextField) {
memory.memoryTitle = sender.text ?? ""
}
The UITextView has confused me slightly though. There's two issues I'm having - I can't create an action in the same way I can for the UITextField, so my next thought was to make the ViewController the delegate and use textViewDidChange to update memory.memoryDescription but that brings me to my second problem.
In order to make the UITextView cell resize dynamically, I used the following tutorial which works perfectly (https://medium.com/#georgetsifrikas/embedding-uitextview-inside-uitableviewcell-9a28794daf01) to make my custom cell this:
class DetailTextTableViewCell: UITableViewCell, UITextViewDelegate {
//Found below method for resizing UITextView and cell - https://medium.com/#georgetsifrikas/embedding-uitextview-inside-uitableviewcell-9a28794daf01
#IBOutlet weak var memoryDescriptionTextView: UITextView!
var textChanged: ((String) -> Void)?
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
memoryDescriptionTextView.delegate = self
memoryDescriptionTextView.backgroundColor = UIColor.red
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
//Found below method for resizing UITextView and cell - https://medium.com/#georgetsifrikas/embedding-uitextview-inside-uitableviewcell-9a28794daf01
func textChanged(action: #escaping (String) -> Void) {
self.textChanged = action
}
func textViewDidChange(_ textView: UITextView) {
textChanged?(textView.text)
}
}
Now I'm stuck with DetailTextTableViewCell being the UITextView's delegate, so I'm not sure how to make it update my memory object in the ViewController when the text changes. If anyone has any ideas or guidance it'd be much appreciated!
Thank you in advance.
First, you don't need textChanged method
func textChanged(action: #escaping (String) -> Void) {
Then, what you need, is assigning your textChanged closure variable (which is good approach btw) in controller's cellForRowAt for each certain cell.
Inside closure declare, that when text view did change, certain item's (from table view data source array) property will be assigned with String parameter of closure and if you need, then reload certain cell for this IndexPath
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
...
cell.textChanged = { text in
self.dataSourceArray[indexPath.row].stringProperty = text
// tableView.reloadRows(at: [indexPath], with: .none)
// if you want to reload row, move calling closure
// to `textViewDidEndEditing` instead
}
...
}
declare this protocol above your cell DetailTextTableViewCell
protocol CellDelegate {
func textViewChanged(textView : UITextView)
}
add a delegate var in your DetailTextTableViewCell
var delegate : CellDelegate?
In the cell for row of your tableView assign self to delegate property of cell
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
...
cell.delegate = self
}
In your DetailTextTableViewCell add this line inside textViewDidChange
func textViewDidChange(_ textView: UITextView) {
textChanged?(textView.text)
delegate?.textViewChanged(textView)
}
Now implement the delegate function in your view controller
func textViewChanged(textView: UITextView) {
}
Inside cellForRowAt do
let cell = ///
cell.memoryDescriptionTextView.tag = indexPath.row
cell.memoryDescriptionTextView.delegate = self
and implement the delegate methods inside the vc
Try to enable user interaction property of text view inside cellForRowAt method.
cell.memoryDescriptionTextView.delegate = self
cell.memoryDescriptionTextView.isUserInteractionEnabled = true
I have a custom UITableViewCell where I've added a UITextField, I'd like to perform some validation on the textfield and set a hasError property on the cell to maybe add a error label to the cell and change the textfield back color.
I'm not using a storyboard and creating my custom cell / UITableViewCell programatically.
I'm using textFieldDidEndEditing in my UIViewController to detect text changes and have no access to the cell, to set my hasError property.
I guess I could loop around the views / textfields by a tag to field the textfield then gain it's parent.
Or maybe I should implement my own version of textFieldDidEndEditing which then fires another event which has the cell and the textfield as parameters.
But I'm not sure if that's the best approach or how to fire an event.
You can use Protocol. https://developer.apple.com/library/archive/documentation/General/Conceptual/DevPedia-CocoaCore/Protocol.html
A simple example:
cellForRow
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = ....
cell.delegate = self
return cell
}
Your UITableViewCell subclass:
class Cell: UITableViewCell, UITextFieldDelegate {
// MARK: - Properties
weak var delegate: CellDelegate?
....
// MARK: - Functions
func textFieldDidEndEditing(_ textField: UITextField) {
self.delegate?.cell(self, textFieldDidEndDiting: textField)
}
}
Your Protocol
protocol CellDelegate: class {
func cell(_ cell: Cell, textFieldDidEndDiting textField: UITextField)
}
Then finally, conform your controller to that protocol like so:
class ViewController: UIViewController, CellDelegate {
func cell(_ cell: Cell, textFieldDidEndDiting textField: UITextField) {
}
}
This question already has answers here:
Open UITableView edit action buttons programmatically
(5 answers)
Closed 5 years ago.
I have made a few custom edit actions on my tableviewcell. It works fine when I swipe, but I was wondering if there was any way to trigger these actions when I tap the cell. Also, I have seen lots of people answer similar questions with just,
tableView.setEditing(true, animated: true)
though this is not the solution I am looking for. I want the actions to immediately get displayed without the press of another button.
Short answer is - there is no such way.
However, if you really need something like that, you can mimic this behaviour, though it requires lot more implementation and state handling on your own.
Here is a quick and very dirty solution, which overrides touchesEnded method of your custom cell. Remember to set up Cell as a dynamic prototype of the cell in your table view in relevant storyboard and set its reuse identifier to identitifer.
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, CellDelegate {
#IBOutlet weak var tableView: UITableView?
override func viewDidLoad() {
super.viewDidLoad()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "identifier") as? Cell else {
return UITableViewCell()
}
cell.textLabel?.text = "\(indexPath.row)"
cell.indexPath = indexPath
cell.delegate = self
return cell
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
return nil
}
func doAction(for cell: Cell) {
let indexPath = cell.indexPath
print("doing action for cell at: \(indexPath!.row)")
// your implementation for action
// maybe delete a cell or whatever?
cell.hideFakeActions()
}
}
protocol CellDelegate: class {
func doAction(for cell: Cell)
}
class Cell: UITableViewCell {
weak var delegate: CellDelegate?
var indexPath: IndexPath!
#IBOutlet weak var buttonAction1: UIButton?
#IBOutlet weak var constraintButtonFakeActionWidth: NSLayoutConstraint?
override func awakeFromNib() {
self.constraintButtonFakeActionWidth?.constant = 0
}
override func touchesEnded(_ touches: Set<UITouch>,
with event: UIEvent?) {
guard let point = touches.first?.location(in: self) else {
return
}
if self.point(inside: point, with: event) {
print("event is in cell number \(indexPath.row)")
self.showFakeActions()
}
}
func showFakeActions() {
self.constraintButtonFakeActionWidth?.constant = 80
UIView.animate(withDuration: 0.3) {
self.layoutIfNeeded()
}
}
func hideFakeActions() {
self.constraintButtonFakeActionWidth?.constant = 0
UIView.animate(withDuration: 0.3) {
self.layoutIfNeeded()
}
}
#IBAction func fakeAction() {
delegate?.doAction(for: self)
}
}
So how does it work? Each cell is a UIView which inherits from abstract UIResponder interface. You can override its methods to do actions on your own on behalf of events that are dispatched to them. This is the first step where you override touchesEnded.
Take a look at the screenshot from interface builder - you have to hook up the constraint.
I've also implemented the delegate which returns nil for all edit actions of the cells, so they don't interfere with your workaround.
Next, you set up a custom delegate to get a callback from the cell. I also attached IndexPath to the cell for the convenience of managing data in the dataSource, which you have to implement.
Remember that this code lacks a lot, like prepareForReuse method implementation. Also, you probably want to do additional checks in touchesEnded override which would guarantee that this delegate callback is not fired more than once per touch and prevent multiple touches. The logic for disabling user interaction on a cell is not implemented here as well. And interface requires fine-tuning (like text appears to be squashed during the animation).
So i have userListTableViewController and userListTableViewCell in which i am connecting the followButton .. this is the code of my userListTableViewCell
import UIKit
class userListTableViewCell: UITableViewCell {
// IBOutlets..
#IBOutlet var followButton: UIButton!
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 createButton(delegate:AnyObject){
followButton.addTarget(delegate, action: "followButtonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
}
}
and this is my cellForRowAtIndexPath code:
myCell.createButton(self)
and this is the func of followButtonTapped in userListTableViewController
func followButtonTapped(object:AnyObject) {
println("button clicked") // ******************** here i want to know in which cell or indexPath the button is being pressed. or maybe when button is being tapped, change the title of that button.
}
I need some nice explanation where i've marked "******************". Thanks for your time.
I'm holding at any cell the NSIndexPath and assigning it at the cellForRow.
At the delegate method I'm returning the cell itself,
(see the UITableView delegate functions - they deliver the UITableView), So at the delegate function you have the relevant cell, and it has the relevant NSIndexPath.
Pay attention - if you assigning the NSIndexPath - any change of the cells like adding row or removing one will make the old NSIndexPath of the other cells to be not true...
Set the button tag to the indexPath.row in your cellForRowAtIndexPath code, and set your followButtonTapped method as an #IBAction with a UIButton parameter, rather than AnyObject
So in your cellForRowAtIndexPath add this:
myCell.followButton.tag = indexPath.row
and change your followButtonTapped method to be:
#IBAction func followButtonTapped (sender: UIButton!) {
println("\(sender.tag) button pressed")
}
You will have to connect followButtonTapped to your follow button in IB, but then should be good to go.
TableView didSelectRowAtIndexPath function is called on click of cell.
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)