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.
Im currently trying to send some information from custom cells to the next view controller in Xcode 7 with Swift 2.
I can send information fine if it is from a label etc but i cannot do it from cells as I'm unable to get the specific cell the user tapped. I have tried to take information from tutortials on how to get the index path but always get an error.
Layout of View Controllers
Code for main VC and error
Any ideas on how to fix this?
You need to create segue like ViewController to ExpanView Make sure
not for UITableViewCell To ExpanView
your tableView.allowsSelection = true And set tableView.delegate = self
Implyment didSelectRowAtIndexPath Method of tableView like this way.
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("exapanView", sender: indexPath)
}
implement prepareForSegue method like this way
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "exapanView" {
let selectedIndexPath = sender as! NSIndexPath
let nameString = self.name.objectAtIndex(selectedIndexPath.row)
}
}
I am trying to figure how to segue to a new view when the user selects a certain row in the current tableview. I am thinking this will be done by the didselectrowatindexpath method but can not figure out the logic of how it will work. I would like it to display a view with the specific courses in the subject the user selected. I think this will use an array? I would appreciate any help here thanks.
Yes, you're right, you can do this be responding to didSelectRowAtIndexPath.
You can have a view controller as your table view delegate that implements these methods:
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
if let thing = self.things.objectAtIndex(indexPath.row) as? Thing
{
self.performSegueWithIdentifier("OpenThing", sender: thing)
}
}
Where "OpenThing" is a segue defined in my storyboard.
Then I have overridden the prepareForSegue method:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
if segue.identifier == "OpenThing"
{
if let controller = segue.destinationViewController as? ThingViewController
{
if let thing = sender as? Thing
{
controller.thing = thing
}
}
}
}
This is a contrived example of having an array of "Things". I access a thing by row index then segue to the next view controller, providing the thing that I want to display.
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.
I have a Tab Bar application, and one of the tabs, which contains a Table View, segues into a third view when a table cell is pressed. The view controller acts as a delegate for the UITableView, and I trigger the segue programatically as follows:
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
println("cell tapped, starting segue")
performSegueWithIdentifier("showDetails", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
println("prep for segue")
// TODO - more code here
}
Finally, I set up the following code to debug the problem with the third view:
class DetailsViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
println("did load")
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
println("will appear")
}
}
The problem is that when I press a table cell for the first time, the viewWillAppear function never gets called until I interact with the UI in some way (e.g. just a tap anywhere on the screen). The view that I want to segue into doesn't show up, as if the screen didn't get refreshed. However, when I tap the screen, the whole animation runs and I can segue as intended. This is my output when I tap a cell:
cell tapped, starting segue
prep for segue
did load
I tried to find solutions online, but all the issues I found it seems to just not work at all. In my case, it is working, but not immediately.
In case it helps, here's a screenshot of my storyboard:
Sefu found the answer and posted it in the comments, I ran into the same issue and his solution worked for me. The trick is to make it so the cell that is selected that triggers the segue needs to have a selection style set (not None), and I also found that deselecting the cell in tableView:didSelectRowAtIndexPath: also needed to happen.
Ran into a similar problem while having my selectionStyle = .None .
An option you can use, if you're like me and don't want a selectionStyle applied is to set the cell item back to unselected in the prep for segue.
That seemed to stopped the 'issue' I was seeing where the segue would work perfectly once, but all subsequent calls would require selecting the cell twice.
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//sending the index path up as the sender so the prep for segue can access the cell
self.performSegueWithIdentifier("segueID", sender: indexPath);
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "segueID"){
if let indexPath : NSIndexPath = sender as? NSIndexPath{
tableViewReference.cellForRowAtIndexPath(indexPath)?.selected = false;
let destinationVC : UIViewControllerClass = segue.destinationViewController as! UIViewControllerClass;
destinationVC.customMethod(/* some value */);
}
}
}