Right now I am facing some problem to pass data from UIViewController to UISpiltViewController.
My app start with UIViewController, and after user login it, there is a segue from UIViewController to UISpiltViewController, UISpiltViewController is root view of a NavigationViewController, and this NavigationViewController is a root view of a TableViewController. I have written a class for this TableViewController, called MasterView, and right now I want to pass some information from loginView to this MasterView.
self.performSegueWithIdentifier("login", sender: self)
But I want to know how to write the prepareforsegue function.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "login"
{
let controller = (segue.destinationViewController as UINavigationController).topViewController as MasterViewController
controller.authorityNum = self.authorityArray
}
}
I want to pass an array, but I will get class cast error. Please help me with this.
Try this i am not sure but i think your segue is Model segue so
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "login"
{
var splitView:UISplitViewController = segue.destinationViewController as! UISplitViewController
var controller = splitView.viewControllers.first?.topViewController as! MasterViewController
controller.authorityNum = self.authorityArray
}
}
Try to NSLog every line it may help
Like this,
let destinationViewController = segue.destinationViewController as! MasterViewController
Swift 3 of the accepted answer.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "login" {
let splitView:UISplitViewController = segue.destination as! UISplitViewController
let navController = splitView.viewControllers.first as! UINavigationController
let controller = navController?.topViewController as! MasterViewController
controller.authorityNum = self.authorityArray
}
}
Related
So I'm learning Core Data and I managed to create a segue with a parent relationship that allows me to segue to show only certain items based on the category you select in the previous VC (A Category View Controller). Now I have created a separate VC after this which shows the weather based on your location and to get to it you have to click the button from the original VC (The Category View Controller) to get to the weatherViewController. However every time I try to do so and perform a segue I run into this error below :
This is the code I have so far :
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let destinationVC = segue.destination as! NoteTableViewController
let weatherDestinationVC = segue.destination as! WeatherViewController
if let indexLocale = noteTableView.indexPathForSelectedRow {
destinationVC.selectionCategory = noteArray[indexLocale.row]
print(indexLocale.row)
} else {
print("Error")
weatherDestinationVC.delegate = self
performSegue(withIdentifier: "goToWeather", sender: self)
}
}
#IBAction func goToWeatherView(_ sender: UIBarButtonItem) {
performSegue(withIdentifier: "goToWeather", sender: self)
}
Any help would be appreciated since I am just learning Core Data!
Conditionally cast the different segue destination view controllers or check for the segue's identifier whichever you prefer.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destinationVC = segue.destination as? NoteTableViewController {
if let indexLocale = noteTableView.indexPathForSelectedRow {
destinationVC.selectionCategory = noteArray[indexLocale.row]
print(indexLocale.row)
}
} else if let weatherDestinationVC = segue.destination as? WeatherViewController {
weatherDestinationVC.delegate = self
}
}
Also, you don't have to performSegue within prepareForSegue.
In my swift app I've the following prepare function:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? LocalPictureCVC {
destination.selectedLocal = selectedLocal
}
}
But when I try to use selectedLocal in LocalPictureCVC it crash due to selectedLocal is nil.
How can I solve this problem?
Try this I hope it will help you:-
first make sure to give segue properly with identifier then code like below
then in first ViewController
var valueToPassInSecondVC = ""
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
//NOTE:- make sure about your identifier is correct as well as destination ViewController
if segue.identifier == "yourIdentifierOfSegue" {
let destVC = segue.destination as! ContainerViewController
destVC.valueFromFirstVC = self.valueToPassInSecondVC
}
}
in your destination class
var valueFromFirstVC:String = ""
//In my case pass String from FirstViewController to SecondViewController
thanks,I hope it will help you.
try checking your segue identifier in your prepare function
if segue.identifier == "Something"
I want to transfer data from the view on the bottom right to the one on the upper right. Thanks in advance.. :)
I think that what you search are unwind segues.
You can find a good how to about segues in this article from Apple:
https://developer.apple.com/library/content/featuredarticles/ViewControllerPGforiPhoneOS/UsingSegues.html
Especially interesting for you should be the section "Creating an Unwind Segue".
The result should then be similar to this:
1. Give your segue a identifier, "make sure the identifier should be created from Controller"
2. use this function
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "yourIdentifier" {
let dvc = segue.destination as! yourVC
`// pass data
dvc.data = data
}
}
You can use it's override method to pass data
1) apply segue.identifier in storyBoard
2) In Action add self.performSegue(withIdentifier:"addTask" , sender: indexPath)
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "addTask" {
let taskData:Task?
let vc = segue.destination as! AddTaskVC
vc.taskData = taskList[indexpath.row]
vc.isUpdateTask = isEditTask
}
}
You can use this when you set segue from first controller to third. Do check for identifier names while creating segue.
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.identifier == "yourIdentifier1"
{
let nextScene = segue.destination as? UIViewController
nextScene.stringUserName = "Mike"
}
else if segue.identifier == "yourIdentifier2"
{
let laterScene = segue.destination as? UIViewController
laterScene.count = 5
}
}
If you still find and error, please show the error
I am trying to pass a users id to a container view by preparing for a segue
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "childSegue" {
if let destinationVC = self.childViewControllers.first as? InterestCollectionController {
destinationVC.currentUser = self.currentUser
}
}
}
however, this is not working. I have my storyboard that looks like this.
storyboard I have also tried using segue.destination as! InterestCollectionController and that did not work either. From my understanding this is the way I should be passing data to my container view. Any help is appreciated thanks!
Just try this without using if statement:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "childSegue" {
let destinationVC = segue.destinationViewController as InterestCollectionController
destinationVC.currentUser = self.currentUser
}
}
1. Make sure your segue identifier matches with storyboard identifier.
2. Also verify once you have given exact segue to the above mentioned controller in storyboard.
Try this one
var destinationVC : InterestCollectionController?
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "childSegue") {
self.destinationVC = segue.destination as? InterestCollectionController
destinationVC.currentUser = self.currentUser
}
}
I tested that the view of the embedded view controller is not loaded, in other words, the viewDidLoad() was not invoked, before the containerVC's prepare() was called.
Therefore, you cannot directly pass data to the destination view controller inside the prepare() function.
I am preparing the values from func prepare. The problem is the application crashes because the destination returns SWRevealViewController instead of UIViewController. I am using SWRevealViewController on the storyboard.
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
if (segue.identifier == "Main") {
let view = (segue.destination as! Main)
view.expired_login = self.expired_login
}
}
It crashes on the let view line. Here is the message
Could not cast value of type 'SWRevealViewController' (0x10afa72a8) to 'JetWayTrade.Main' (0x10afac038).
Is there a way to get the Main so that I can set its properties? Here is the storyboard image
If I understand you correctly you will want to cast the destination view controller as SWRevealViewController:
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
if (segue.identifier == "Main") {
let view = (segue.destination as! SWRevealViewController)
view.expired_login = self.expired_login
}
}
If you are expecting your Main view controller to be the destination then you will have to check that your segue names are set correctly in your storyboard.