I have a UITableView and I am trying to make a segue to another viewcontroller, I need the row number so that I can select a string from an array so that I can display this string in the next view controller, I have this code at the moment.
let tableFrontView = segue.destination as! FCTableFrontViewController
tableFrontView.frontText = path[FlashCardsTableViewCell.init().tag].flashCardFront
the FlashCardsTableViewCell.init().tag is currently returning an int for testing purposes though I am wanting to know what I can replace it with to get me the number of the row which was selected by the user.
Thanks
You can try like this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let tableFrontView = segue.destination as! FCTableFrontViewController
let selectedIndexPath = tblView.indexPathForSelectedRow
let selectedRow = (selectedIndexPath?.row)!
print(selectedRow)
}
I assume you are writing the code snippet shown in prepare(for:)?
If that's the case, go to where you perform the segue, which is likely in the didSelectedRowAtIndexPath delegate method. If you don't have such a method, you should implement it.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "showTableFrontVC", sender: nil)
}
Replace whatever it is that you are passing as sender now, and replace that with indexPath.row.
performSegue(withIdentifier: "showTableFrontVC", sender: indexPath.row)
Now in prepare(for:), you can unwrap sender as an Int:
let tableFrontView = segue.destination as! FCTableFrontViewController
let rowSelected = sender as! Int
tableFrontView.frontText = path[rowSelected].flashCardFront
Use TableView's delegate method :
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// indetify cell using indexPath.row attribute
}
EDIT 2: Added a half-solution at bottom. Still open to a full solution
EDIT 1: Added images.
I need help fixing navigation between a second and third tableview.
I have a Navigation Controller, and three table views. The first two show up fine such that clicking a dynamic tableview cell > in the first tableview moves to the second tableview. However the second tableview cell chevron > while set in the storyboard (Accessory: Disclosure Indicator) doesn't show up during runtime, and therefore clicking on it does not move to the third tableview. I need help fixing that.
In each case I Ctrl+linked the cells to the next tableview in storyboard as show, and have prepare for segue in the previous tableview controllers. However only one works and the other seems orphaned.
If you could suggest a checklist in making sure the Navigation Controller works across three tableviews that would be helpful. Not sure what code to show so I'll post both segues. But it might not be a segue issue so I don't know.
first tableview Weeks works going to second tableview Leagues. Loads json file depending on what is clicked.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toLeagues"
{
let leaguesController = segue.destination as! LeaguesViewController
// pass the selected row
let selectedRow = self.tableView.indexPath(for: sender as! UITableViewCell)!.row
if selectedRow == 0
{
leaguesController.weekFileName = "sports_week_1"
}
else
{
leaguesController.weekFileName = "sports_week_2"
}
}
But second tableview Leagues doesn't work going to third tableview Games
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toGames"
{
let gamesController = segue.destination as! GamesViewController
// pass the selected row
let selectedRow = self.tableView.indexPath(for: sender as! UITableViewCell)!.row
gamesController.gameName = selectedRow.description
}
}
EDIT 1: Added images:
Starts off fine in first tableview...
Stops here in second tableview, can't move to third tableview
EDIT 2: Half solution
I found a half solution. Menu item now opens new view, only that the chevron appears after the fact. didSelectRowAt adds the missing disclosure indicator directly and goes to the new view controller. Couldn't find a viewWillAppear with IndexPath so I opted for didSelectRowAt. Works when clicked at least. Just the disclosure indicator missing on initial load. How to load the accessoryType before the view runs?
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath)
cell?.accessoryType = .disclosureIndicator
// force menu to move to GamesViewController
let myGamesView = self.storyboard!.instantiateViewController(withIdentifier: "gamesView")
self.navigationController?.pushViewController(myGamesView, animated: true)
}
Try setting accessoryType in cellForRowAt instead of didSelectRowAt.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "yourIdentifier") as! YourCustomCell
//Your other code
cell.accessoryType = .disclosureIndicator
return cell
}
I have a UIViewController which should show me DetailInformations depending on what Cell was pressed in the UITableViewController.
For the moment I am passing them through a sequel:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "show" {
var ctrl = segue.destination as! DetailViewController
ctrl.information = _informationList[id]
}
}
The id variable is set through:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
id = indexPath.row
}
Now in my UIViewController I change the information with:
override func viewDidLoad() {
super.viewDidLoad()
setInformation(i: information)
}
Now my problem is, that if I press, lets say cell 2. It switches to the ViewController and shows Information of cell 1. Than I go back to the tableview and I press cell 3. Then it shows me cell 2.
In short, it seems that the viewController is loaded (with the last information), before it sets the new information.
Is there any better way to solve this?
Try using indexPathForSelectedRow in prepareForSegue as of it looks like that you have created segue from UITableViewCell to the Destination ViewController so that prepareForSegue will call before the didSelectRowAt.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "show" {
var ctrl = segue.destination as! DetailViewController
if let indexPath = self.tableView.indexPathForSelectedRow {
ctrl.information = _informationList[indexPath.row]
}
}
}
I am assuming based on what you are describing is that you used a segue in your Storyboard to link directly from the cell to the detail view controller. This is not what you want to do, as mentioned earlier, because you don't get the order of events you would expect. You could use the delegation design pattern for this, but assuming you want to stick with segues you need to make the "show" segue from the table VC itself to the detail VC. You then manually call the segue from the tableView didSelectRowAt code.
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
id = indexPath.row
performSegue(withIdentifier: "show", sender: self)
}
Finally, you could then use an unwind segue when you come back to catch any data changes initiated in the detail VC.
I have a table in iOS. How to know what cell the user has clicked and pass information? I have been searching and I could find prepareForSegue. Is this the right method?. All the cases I could find were complicated and with a lot of elements. Can anyone apply to this simplified case and explain in a simple way, please. I am learning and for me is hard to understand this part.
let favoriteThings = [
"First",
"Second",
"Third",
]
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.favoriteThings.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// create a new instance of UITableViewCell. I give the name "cell" in Attributes > Identifier:
let cell = tableView.dequeueReusableCellWithIdentifier("FavoriteThingCell") as! UITableViewCell
var favoriteThingForRow = self.favoriteThings[indexPath.row]
cell.textLabel?.text = favoriteThingForRow
return cell
}
// How to know what cell was clicked and pass the right information? Is this the right method?:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// the second screen. I select the icon of View Controller and Attributes Inspector > Class and Storyboard ID is: DetallViewController
var secondScene = segue.destinationViewController as! DetallViewController
if let indexPath = self.tableView.indexPathForSelectedRow() {
let selected = favoriteThings[indexPath.row]
}
}
The usual way is to implement the table view delegate method tableView:didSelectRowAtIndexPath:. It's called by the runtime engine when the user taps a cell. In the method you can call performSegueWithIdentifier:sender: and pass the NSIndexPath instance as parameter sender.
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
performSegueWithIdentifier("MyIdentifier", sender: indexPath)
}
The method prepareForSegue:sender: is also called automatically right before the segue is performed to be able to setup things. As you have the selected index path you can retrieve the appropriate datasource item
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// the second screen. I select the icon of View Controller and Attributes Inspector > Class and Storyboard ID is: DetallViewController
var secondScene = segue.destinationViewController as! DetallViewController
let indexPath = sender as! NSIndexPath
let selected = favoriteThings[indexPath.row]
}
I'm encountering problems with my UITableViewCells. I connected my UITableView to a API to populate my cells.
Then I've created a function which grabs the indexPath.row to identify which JSON-object inside the array that should be sent to the RestaurantViewController.
Link to my Xcode Project for easier debugging and problem-solving
Here's how my small snippet looks for setting the "row-clicks" to a global variable.
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
i = indexPath.row
}
And here's my prepareForSegue() function that should hook up my push-segue to the RestaurantViewController.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "toRestaurant"{
let navigationController = segue.destinationViewController as UINavigationController
let vc = navigationController.topViewController as RestaurantViewController
vc.data = currentResponse[i] as NSArray
}
}
And here's how I've set up my segue from the UITableViewCell
Here's my result, I've tried to click every single one of these cells but I won't be pushed to another viewController...I also don't get an error. What is wrong here?
Tried solutions that won't work
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "toRestaurant"{
let vc = segue.destinationViewController as RestaurantViewController
//let vc = navigationController.topViewController as RestaurantViewController
vc.data = currentResponse[i] as NSArray
}
}
The problem is that you're not handling your data correctly.
If you look into your currentResponse Array, you'll see that it holds NSDictionaries but in your prepareForSegue you try to cast a NSDictionary to a NSArray, which will make the app crash.
Change the data variable in RestaurantViewController to a NSDictionary and change your prepareForSegue to pass a a NSDictionary
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if let cell = sender as? UITableViewCell {
let i = redditListTableView.indexPathForCell(cell)!.row
if segue.identifier == "toRestaurant" {
let vc = segue.destinationViewController as RestaurantViewController
vc.data = currentResponse[i] as NSDictionary
}
}
}
For Swift 5
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if let cell = sender as? UITableViewCell {
let i = self.tableView.indexPath(for: cell)!.row
if segue.identifier == "toRestaurant" {
let vc = segue.destination as! RestaurantViewController
vc.data = currentResponse[i] as NSDictionary
}
}
}
The following steps should fix your problem. If not, please let me know.
Remove your tableView(tableView, didSelectRowAtIndexPath:) implementation.
Make data on RestaurantViewController have type NSDictionary!
Determine the selected row in prepareForSegue:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if let cell = sender as? UITableViewCell {
let i = tableView.indexPathForCell(cell)!.row
if segue.identifier == "toRestaurant" {
let vc = segue.destinationViewController as RestaurantViewController
vc.data = currentResponse[i] as NSDictionary
}
}
}
Dropbox link to stack3 directory
I am having difficulty understanding why your software is much different than a standard 2 level tableview structure. So I coded a short example which you can access from this link. I have also included the sources code below.
The program mimics what you have (as best as I understood it). Table Controller 1 segues to Table Controller 2 from the tableview cell. I had no issues with segue-ing. Notice that I do not have nor need to augment the Storybook to initiate the segue.
I have embedded both the controllers in Navigation Controllers. My experience is that it saves a lot of effort to set up the navigation.
Alternately, I could have control-dragged from the first TableViewController symbol on top of the screen to the second controller and set up the segue.
I used a global variable (selectedRow) although it is not a recommend practice. But you just as easily use the prepareForSegue to set a variable in the RestaurantTableViewController (I show an example)
Finally, I recommend checking the Connections Inspector (for the table view cell in the first controller) to confirm that there is a segue to the second controller. If you control-dragged properly there should be confirmation prompt as well as an entry in the Connections Inspector.
Unfortunately I just cant get the code properly formatter
import UIKit
var selectedRow = -1
class TableViewController: UITableViewController {
var firstArray = ["Item1","Item2","Item3","Item4"]
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return firstArray.count
}
let nameOfCell = "RestaurantCell"
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(nameOfCell, forIndexPath: indexPath) as UITableViewCell
cell.textLabel!.text = firstArray[indexPath.row]
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
selectedRow = indexPath.row
}
// MARK: - Navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let vc = segue.destinationViewController as RestaurantTableViewController
// can write to variables in RestaurantTableViewController if required
vc.someVariable = selectedRow
}
}
import UIKit
class RestaurantTableViewController: UITableViewController {
var secondArray = ["Item 2.1", "Item 2.2", "Item 2.3", "Item 2.4"]
var someVariable = -1
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return secondArray.count
}
let nameOfCell = "RestaurantCell"
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(nameOfCell, forIndexPath: indexPath) as UITableViewCell
cell.textLabel!.text = secondArray[indexPath.row]
if indexPath.row == selectedRow {
cell.textLabel!.text = cell.textLabel!.text! + " SELECTED"
}
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
selectedRow = indexPath.row
}
}
I noticed that in your screenshot of your storyboard, the segue is connecting the first prototype cell to the RestaurantViewController. This prototype cell looks like it's the "Basic" style of cell with a disclosure indicator accessory on the right. But look at the screenshot of your app running. The table is being populated with cells that appear to be the "Subtitle" style of cell without a disclosure indicator accessory on the right.
The reason that your segue is never firing no matter what you do is that the segue is only configured to work for a specific prototype cell, but that prototype cell is never being used when you populate the table. Whatever you're doing in tableView:cellForRowAtIndexPath:, you're not using the prototype cell that you want.
#Starscream has the right idea dequeueing the right cell with the right identifier and matching it with the identifier of the prototype cell in Interface Builder. The crash that you're getting even after doing that might be because of the previous problem mentioned in the comments above. Your segue in the storyboard is clearly pointing to a UITableViewController. Your code in prepareForSegue:sender: should be let vc = segue.destinationViewController as RestaurantViewController, as long as RestaurantViewController is a subclass of UITableViewController. You'll crash if you try to cast it as a UINavigationController. Also make sure that the class for the destination UITableViewController in the storyboard is listed as RestaurantController in the Identity Inspector pane. You'll crash if your program compiles thinking that the storyboard just contains a generic UITableViewController there.
Getting back to the original problem more, I don't know how you've implemented tableView:cellForRowAtIndexPath:, which might be crucial. Maybe it's not so simple. Maybe you plan on handling many prototype cells or generate custom cells at runtime. In this case, one way to make this simple for you is to programmatically perform the segue when the user taps on a cell. Instead of using a specific prototype cell, make the segue a connection originating from the "Restauranger nära mig" UITableViewController going to the RestaurantViewController. (Connect in Interface Builder by control-click dragging from the Table View Controller icon at the top of the first one over to the body of the second). You must give this segue an identifier in the Attributes Inspector pane to make this useful. Let's say it's "toRestaurant". Then at the end of your tableView:didSelectRowAtIndexPath: method, put this line of code: self.performSegueWithIdentifier("toRestaurant", sender: self). Now no matter what cell is selected in the table, this segue will always fire for you.
Try creating cells like this in your cellForRow method:
let cell: UITableViewCell = tableView.dequeueReusableCellWithIdentifier("MyTestCell", forIndexPath: indexPath)
Im going out on a whim here since I am just getting into swift right now but the way I do it in my prepareForSegue() is something like this:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "toRestaurant"{
let navigationController = segue.destinationViewController as UINavigationController
let vc = navigationController.topViewController as RestaurantViewController
//notice I changed [i] to [index!.row]
vc.data = currentResponse[index!.row] as NSArray
}
}
What it looks like to me is that you are calling the i variable which is kind of like a private variable inside a method of your class. You can do something like #Syed Tariq did with the selectRow variable and set it above your class SomeController: UIViewController /*, maybe some more here? */ { and then sign the variable inside your
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
selectedRow = indexPath.row
}
method like above but both ways should work rather well.
I had the same problem and I found the solution to be:
performSegueWithIdentifier("toViewDetails", sender: self)
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var cellnumber = procMgr.processos[indexPath.row].numero
println("You selected cell #\(indexPath.row)")
println(cellnumber)
performSegueWithIdentifier("toViewDetails", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "toViewDetails" {
let DestViewController : ViewDetails = segue.destinationViewController as! ViewDetails
}
}
You may need to get the selected cell index of the UItableview. Below code used the selected cell index (UItableview.indexPathForSelectedRow) to get a correct element of the array.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "seguaVisitCardDetial" {
let viewController = segue.destinationViewController as! VCVisitCardDetial
viewController.dataThisCard = self.listOfVisitCards[(tblCardList.indexPathForSelectedRow?.row)!]
}
}
I had this problem, too; the segue from UITableViewCell did not call.
After some searching, I found it is because I had chosen "No Selection" for "Selection" field.