So I have a table view that I want to segue to specific views when a specific cell is selected. For example, if the cell at index 0 is selected, I want the "RedViewController" to be visible.
The example I keep receiving looks something like this (located in the VC with the table view)
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
if let destination = segue.destinationViewController as? RedViewController {
if let blogIndex = tableView.indexPathForSelectedRow()?.row {
destination.blogName = swiftBlogs[blogIndex]
}
}
}
}
(Where blogName and swiftBlogs are random examples)
But this just loads specific data into a singular view controller. Preferably I want a switch statement for each index path that makes a specific VC visible.
Ok, so write your code that way. Don't link your table views directly with a segue. Instead write code in your didSelectRowAtIndexPath.
In that method you can write a switch statement, or use an array lookup, to load a view controller using a unique ID and the instantiateViewControllerWithIdentifier, or trigger a through code using performSegueWithIdentifier.
I figured it out thanks to Duncan C and a little more research!
In the table view VC I added the handy function
func switchToViewController(identifier: String) {
let viewController = self.storyboard?.instantiateViewControllerWithIdentifier(identifier) as! UIViewController
self.navigationController?.setViewControllers([viewController], animated: false)
}
And in the didselectRowAtIndexPath
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let selectedRow = indexPath.indexAtPosition(indexPath.row)
switch selectedRow {
case 0:
switchToViewController("RedVCIdentifier")
default:
println("Unknown Cell selected")
}
}
But also had to add a Storyboard ID to the RedViewController in the storyboard as "RedVCIdentifier"
Related
I am trying to pass value I get from Firebase to another tableView. I get 2 values from Firebase - "Brands" and "Products". I am trying to make like car app. If you click on Ford then new tableView will appear and shows all the Ford models. This is what I've done so far.
like this I get Brands from Firebase:
func parseSnusBrands(){
let ref = FIRDatabase.database().reference().child("Snuses").child("Brands")
ref.observeSingleEventOfType(.Value, withBlock: { (snapshot) in
if snapshot.exists() {
if let all = (snapshot.value?.allKeys)! as? [String]{
for a in all{
if let products = snapshot.value![a] as? [[String:String]]{
self.snusBrandsArray.append(["key":a,"value":products])
}
}
self.snusBrandsTableView.reloadData()
}
}
})
}
And like this I detect which cell is clicked and print the product that belongs to the clicked Brand:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
print("products at \(indexPath.row) --> \(snusBrandsArray[indexPath.row]["value"])")
}
How to pass the (snusBrandsArray[indexPath.row]["value"]) to new tableView? I tried using segues and looking for tutorials like "How to pas value between viewControllers" but I am out of luck. Right now I have 2 tableViewController.swift files and one tableViewCustomCell.swift file. Do I need some more files?
For send data, first of all declare your variable in 2nd view controller..
var productsValue = [[String:String]]()
and in 1st viewcontroller
var valueTopass = [[String:String]]()
Than in didSelectRowAtIndexPath, take a value in one valueTopass
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("products at \(indexPath.row) --> \(snusBrandsArray[indexPath.row]["value"])")
if let products = snusBrandsArray[indexPath.row]["value"] as? [[String:String]]{
valueTopass = products
performSegueWithIdentifier("toProducts", sender: self)
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?){
if (segue.identifier == "toProducts") {
var viewController = segue.destinationViewController as! SnusProductsTableViewController
viewController.productsValue = valueTopass
print(productValues)
}
}
You need to use Segues to pass the data forward.
To pass data from the current view controller to the next new view controller using segues, first create a segue with an identifier in the relevant storyboard. Override your current view controller's prepareForSegue method. Inside the method check for the segue you just created by its identifier. Cast the destination view controller and pass data to it by setting properties on the downcast view controller.
Setting an identifier for a segue:
Segues can be performed programatically or using button action event set in the storyboard by ctrl+drag to destination view controller.
You can call for a segue programatically, when needed, using segue identifier in the view controller:
func showDetail() {
performSegueWithIdentifier("showDetailingSegue", sender: self)
}
You can configure segue payload in the override version of prepareForSegue method. You can set required properties before destination view controller is loaded.
Swift
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetailingSegue" {
let controller = segue.destinationViewController as! DetailViewController
controller.isDetailingEnabled = true
}
}
DetailViewController is the name of the second view controller and isDetailingEnabled is a public variable in that view controller.
To expand on this pattern, you can treat a public method on DetailViewController as a pseudo initializer, to help initialize any required variables. This will self document variables that need to be set on DetailViewController without having to read through it's source code. It's also a handy place to put defaults.
Swift
func initVC(isDetailingEnabled: Bool) {
self.isDetailingEnabled = isDetailingEnabled
}
Why not pass the whole dictionary with all the contents from firebase to the new VC using prepare for segue?
And then store the dict in the destinationVC data model?
That should do the trick.
My problem is I would like to Pass data from my collection view to a new view (tableview- but I think it's not necessary info)
override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
let myVC = DetailsTableViewController()
myVC.movieTitle = movies[indexPath.row].movieTitle!
print (movies[indexPath.row].movieTitle!)
performSegueWithIdentifier("DetailSegue", sender: reuseIdentifier)
}
Print is OK, but my movieTitle: String? will NIL on the DetailsViewController.
Help!
performSegueWithIdentifier will instantiate an appropriate destination controller and present it. The DetailsTableViewController you have instantiated here as myVC is never shown. You have a couple of options for how to approach this:
If you want to use segues then trigger the segue in didSelectItemAtIndexPath and implement prepareForSegue to pass data to the destination view controller (a destinationViewController will be available on the UIStoryboardSegue passed to that method).
Alternately you could avoid using segues and present your myVC directly by pushing it onto your current navigation controller (if one exists you could call self.navigationController.pushViewController(myVC, animated:true)), presenting it as a modal, or whatever makes sense in your app.
problem solved. thanks
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "DetailSegue" {
let detailsVC = segue.destinationViewController as! DetailsTableViewController
if let cell = sender as? UICollectionViewCell, indexPath = collectionView!.indexPathForCell(cell) {
// use indexPath
detailsVC.movieTitle = movies[indexPath.row].movieTitle!
}
}
}
I have a tableView with 7 rows, each row is a different action. When a user taps on a row, a view controller is shown as a popover and a text field is displayed for them to add a note. I then want to save this note to Parse but I need to save the passedChildID with it and therefore it (passedChildID) needs to be passed from the tableviewcontroller. I have this working in other area's of my app from one tableView to another tableView but for some reason it won't work with the popover.
The following code is in SingleChildViewTableViewController.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "childToNote" {
let popoverViewController = segue.destinationViewController
popoverViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
popoverViewController.popoverPresentationController!.delegate = self
let noteActionViewController = segue.destinationViewController as! actionNoteViewController
if let indexPath = tableView.indexPathForCell(sender as! UITableViewCell) {
noteActionViewController.passedChildID = passedChildID
}
}
if segue.identifier == "childToItemNeeded" {
//other stuff
}
}
This builds and runs fine, but when I tap on that particular row, I get the following error.
Could not cast value of type '<<app_name>>.SingleChildTableViewController' (0x10e1bef60) to 'UITableViewCell' (0x110bca128).
I have tried moving the let noteActionViewController... code above the let popoverViewController figuring that the former was never getting run but that didn't change anything.
The segue is being performed as followed (in case it makes any difference).
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if indexPath.row == 0 {
performSegueWithIdentifier("childToNote", sender: self)
}
}
I'm stumped because this code has worked elsewhere in my app without fail.
it looks like your problem lies in this line
indexPathForCell(sender as! UITableViewCell)
the sender in this case you are telling it to be self, which is a UIViewController
performSegueWithIdentifier("childToNote", sender: self)
You are then telling in the indexPathForCell line to cast it as a UITableViewCell but its of type SingleChildTableViewController. So change the sender to be the UITableViewCell
Maybe you can save the indexPath as a local variable and when you select a cell you change the value of the variable.
I have two table view controllers
InvoiceList view controller
InvoiceShow view controller
I use didSelectRowAtIndexPath method as bellow to get selected table cell specific value
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let rowObject = objects[indexPath.row]
let invoicehash = rowObject["hash_key"]!
}
i need to send invoicehash value to InvoiceShow controller when click the table cell of InvoiceList
i tried to use prepareForSegue function. but it is not applicable because it will trigger before the didSelectRawAtIndexPath function. so when i implemented it, gives the previous click event variable value. not correct one.
Please help me to access invoiceHash variable value from InvoiceShow controller
You will get the selected cell in prepareForSegue method itself.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let selectedIndexPath = self.tableView.indexPathForSelectedRow()!
let rowObject = objects[selectedIndexPath.row]
let invoiceHash = rowObject["hash_key"]!
let invoiceShowViewController = segue.destinationViewController as! InvoiceShowViewController
// Set invoiceHash to `InvoiceShowViewController ` here
invoiceShowViewController.invoiceHash = invoiceHash
}
You can still use a segue if you want and/or already setup on your storyboard.
You just need to connect the two view controllers in Interface Builder directly from one to another.
So, start ctrl-dragging from the controller itself and not from the TableViewCell (take a look at the screenshot)
then use the performSegueMethod with the new segue identifier like this:
self.performSegueWithIdentifier("mySegueIdentifier", sender: self)
and finally, your prepareForSegue method:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "mySegueIdentifier" {
let selectedIndex = self.invoiceTableView.indexPathForSelectedRow
//if element exist
if selectedIndex?.row < myDataSourceArray.count {
let destination = segue.destinationViewController as! InvoiceShowViewController
let invoice = myDataSourceArray[selectedIndex!.row]
destination.invoice = invoice
}
}
}
That's it!
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.