TableView action per item - swift

I have a tableView like this:
class ViewController: UIViewController {
#IBOutlet var tableView: UITableView!
let names = ["TEXT1", "TEXT2", "TEXT3"]
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view.
tableView.delegate = self
tableView.dataSource = self
}
}
extension ViewControllerMeer: UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
let name = names[indexPath.row]
print("You clicked on \(name)")
}
}
extension ViewControllerMeer: UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return names.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = names[indexPath.row]
let n = names[indexPath.item]
switch n {
case "TEXT1":
print("s1")
case "TEXT2":
print("s2")
case "TEXT3":
print("s3")
default:
break
}
return cell
}
}
It reads the items from the 'let names', So far so good :) I now want to add some actions because now every item will print 'You tapped me'. I figured something out like
override func tableView(_ tableView: UITableView,
didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
if indexPath.row == 0 {
print("cell1")
} else if indexPath.row == 1 {
print("cell2")
} else if indexPath.row == 2 {
print("cell3")
}
}
The only problem is that it generates an error 'Method does not override any method from its superclass'. So I guess this won't work. What would be a good method to do it?

remove the override in front of func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
And you can either to a big if statement or switch statement to do something with the names or you can do something like:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
let name = names[indexPath.row]
print("You clicked on \(name)")
switch indexPath.row {
case 0:
//do something
self.shareApp()
case 1:
//do something else
self.writeReview()
default:
break
}
}

I just copied your codes to show you basically if you really want to override tableview functions
class ViewController: UITableViewController {
#IBOutlet var tableView: UITableView!
let names = ["TEXT1", "TEXT2", "TEXT3"]
override func viewDidLoad() {
super.viewDidLoad()
}
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("You tapped me!")
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return names.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = names[indexPath.row]
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
let name = names[indexPath.row]
print("You clicked on \(name)")
}
}

Related

how to back data from viewcontroller to tableview use delegate

extension SecondViewController: UITableViewDelegate, UITableViewDataSource, EditContactDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return contacts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ContactTableView
cell.contact = contacts[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let newVC = NewViewController()
newVC.nameLabel.text = contacts[indexPath.row].name
newVC.delegate = self
newVC.numberPhoneLabel.text = contacts[indexPath.row].numberPhone
newVC.avatarView.image = contacts[indexPath.row].avatar
self.navigationController?.pushViewController(newVC, animated: true)
}
func editContact(name: String, numberPhone: String) {
var contact:Contact?
let nameEdit = name
let numberEdit = numberPhone
contact?.name = nameEdit
contact?.numberPhone = numberEdit
}
}
My data is not updating at tableview even though delegate worksenter image description here
Make variable selectedIndex and set value on did select method
var selectedIndex = 0
func editContact(name: String, numberPhone: String) {
guard selectedIndex > 0 else { return }
contacts[selectedIndex].name = name
contacts[selectedIndex].numberPhone = numberPhone
tableView.reloadData()
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let newVC = NewViewController()
newVC.nameLabel.text = contacts[indexPath.row].name
newVC.delegate = self
newVC.numberPhoneLabel.text = contacts[indexPath.row].numberPhone
newVC.avatarView.image = contacts[indexPath.row].avatar
self.navigationController?.pushViewController(newVC, animated: true)
selectedIndex = indexPath.row
}

How to change editing style for specific cell in tableview

I have a tableview where the editingstyle is .delete for all the cells. But I want to have some specific cells that doesnt have editingstyle (so that you can't swipe them, .none). Anyone have any suggestions for how to implement this?
I tried to write something like UITableViewCell.EditingStyle.none for that specific row but that didnt work.
Thanks in advance, Pontus
Consider the following example:
class ViewController: UITableViewController {
private let arr = (1...10).map { "Item \($0)" }
override func viewDidLoad() {
super.viewDidLoad()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arr.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell")
cell?.textLabel?.text = arr[indexPath.row]
return cell ?? UITableViewCell()
}
override func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCell.EditingStyle {
if indexPath.row == 2 {//<- Your condition
return .none
} else {
return .delete
}
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
}
So the key is to use editingStyleForRowAt in order to change the style for a specific cell (or even multiple cells) (see the documentation for further reference: https://developer.apple.com/documentation/uikit/uitableviewdelegate/1614869-tableview).

Inserting a table view row data from another table view?

So I have two table views. MainTableView and SecondaryTableView, The MainTableView has empty rows with no text. A Table view cell is configured though. These rows have the option to delete. The SecondaryTableView rows also have an editing style in which I am using to ADD the selected row into the MainTableView rows.
class MainVC: UIViewController,UITableViewDataSource,UITableViewDelegate {
#IBOutlet var mycartableview: UITableView!
var passedcar = String()
override func viewDidLoad() {
super.viewDidLoad()
mycartableview.tableFooterView = UIView(frame: CGRect.zero)
}
var diynames: [String] = ["a","b","c"]
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return diynames.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let diyname = diynames[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "mycarcell") as! mycarcell
cell.mycartitle.text = diyname
return cell
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete{
diynames.remove(at: indexPath.row)
tableView.beginUpdates()
tableView.deleteRows(at: [indexPath], with: .fade)
tableView.endUpdates()
}
}
SecondaryVC code:
class MainVC: UIViewController, UITableViewDelegate, UITableViewDataSource{
let names = ["aa","ba","ca","da","ea",]
#IBOutlet var tableview: UITableView!
#IBOutlet var slctedcar: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.tableview.backgroundColor = .white
// Do any additional setup after loading the view.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return names.count
return names.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "diylistcell") as! diylistcellTableViewCell
cell.diytitle.text = names[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let addbutton = UITableViewRowAction(style: .normal, title: "Add") { (rowAction, indexpath
) in
print("Add clicked")
let mycarvc = MyCarViewController()
mycarvc.diynames.append(contentsOf: self.hcdiynames)
let hcindexpath = IndexPath(row: mycarvc.diynames.count - 1, section: 0)
mycarvc.mycartableview.insertRows(at: [hcindexpath], with: .automatic) //this is where the error occurs. Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value
mycarvc.mycartableview.endUpdates()
}
addbutton.backgroundColor = UIColor.darkGray
return [addbutton]
}
Clear Image of Error
That's where my pain is coming from. As you could see in the picture above the highlighted area it says that my array coming from the main vc is a count of 8. That checks out completely because the original array has 3 and I am appending 5 new ones. The error implicitly found nil has left me clueless in this scenario. If anybody has any suggestions on how to fix this problem it would be highly appreciated, thank you .
This is a common error when you try to transfer data between VC , I usually create 1 variable which will store what I want and after in the viewDidLoad() I give the value of this variable to what I really want , IN your code the equivalent is
class MainVC: UIViewController,UITableViewDataSource,UITableViewDelegate {
#IBOutlet var mycartableview: UITableView!
var passedcar = String()
// I JUST CREATED THE VARIABLE WHICH WILL HOLD OUR VALUES
var diynamesContainer = [String]()
///////////////////
var diynames: [String] = ["a","b","c"]
override func viewDidLoad() {
super.viewDidLoad()
mycartableview.tableFooterView = UIView(frame: CGRect.zero)
// I ADD TO OUR ARRAY THE VALUE OF THE diynamesContainer
diynames.append(contentsOf: diynamesContainer)
//////////////////
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return diynames.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let diyname = diynames[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "mycarcell") as! mycarcell
cell.mycartitle.text = diyname
return cell
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete{
diynames.remove(at: indexPath.row)
tableView.beginUpdates()
tableView.deleteRows(at: [indexPath], with: .fade)
tableView.endUpdates()
}
}
/*
// MARK: - Navigation
and in our main vc you replace
let mycarvc = MyCarViewController()
mycarvc.diynames.append(contentsOf: self.hcdiynames)
by
let mycarvc = MyCarViewController()
mycarvc.diynamesContainer = self.hcdiynames
Try to run your code, the error will go away

How to edit row of cell?

I can not turn on editing mode in the first row of the cell. I tried this code but it didn't help.
public func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
if indexPath.row == 1{
return true
}
return false
}
Can someone help me?
Firstly, make sure your have added UITableViewDataSource protocol. Secondly, you may also need the following implementations.
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let myAction = UITableViewRowAction(style: .normal, title: "MY_ACTION") { (action, indexPath) in
print("I'm here")
}
return [myAction]
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
}
If you want to edit first row then replace
if indexPath.row == 1
with
if indexPath.row == 0
Because indexPath.row starts from 0 not from 1.
Hope that will help.
EDIT:
Since you didn't show your complete code I am adding example code here.
check below code:
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var tbl: UITableView!
let arr = ["1", "2", "3"]
override func viewDidLoad() {
super.viewDidLoad()
tbl.dataSource = self
tbl.delegate = self
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.tbl.dequeueReusableCell(withIdentifier: "cell")!
cell.textLabel?.text = self.arr[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arr.count
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
//set 0 for first cell
if indexPath.row == 0 {
return true
}
return false
}
//Need this method for delete cell
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == UITableViewCellEditingStyle.delete {
tbl.reloadData()
}
}
}

UITableView only displays one section

I have a UITableView that is supposed to have items in sections but only the first section (Science) in the array is appearing and I'm not sure what's wrong with it. It should be displaying both sections.
My code:
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{
#IBOutlet weak var tableView: UITableView!
var checked = [Bool]()
let section = ["Science", "Math"]
let items = [["Physics", "Biology", "Chemistry"], ["Algebra I", "Algebra II", "Statistics"]]
override func viewDidLoad(){
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.tableView.allowsMultipleSelection = true
}
override func didReceiveMemoryWarning(){
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return self.items[section].count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int{
// #warning Incomplete implementation, return the number of sections
return self.section.count
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String?{
return self.section[section]
}
//All before.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = self.items[indexPath.section][indexPath.row]
//MARK: -Checkmark and save support.
cell.accessoryType = cell.isSelected ? .checkmark : .none
cell.selectionStyle = .none // to prevent cells from being "highlighted"
return cell
}
//MARK: - Checkmark and save functions.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
//MARK: - Sections
}
You made a mistake, wrong method. Let change numberOfSectionsInTableView(tableView:) to:
func numberOfSections(in tableView: UITableView) -> Int {
return self.section.count
}
In ViewDidLoad :
tableView.delegate = self
tableView.dataSource = self