I am creating a game in swift and my goal is have each game level access the same view controller, but I need to send unique information from the button reaching that view controller so that I can access core data in the next view controller based on the information sent from the first view controller.
My problem is I do not know how to send multiple pieces of information from the first view controller to the second view controller in the prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
I tried setting the unique information of each button in the keyPath storage, but I can't access it
LevelsMainScreen.swift
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var dest : Levels = segue.destinationViewController as Levels
//Getting the value of the keyPath of the tapped button to send to levels view controller
dest.level = sender?.keyPath("levels")
}
Here is the view controller I want to send it to so I can start to access core data information
class Levels: UIViewController {
#IBOutlet var lblSubLevel: UILabel!
#IBOutlet var lblLevel: UILabel!
var level = Int()
var subLevel = Int()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
lblLevel.text = "\(level.value)"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
`
You have to set an identifier for each segue from the storyboard in attributes inspector. Then, in the LevelsMainScreen.swift controller prepareForSeque method check for the segue identifier is equal to the repective segue identifier given by you. There you can assign the levels as you wanted.
ie., Name the the segue identifier as segue1, segue2, segue3 from attribute inspector in each segue.
In the LevelsMainScreen,
override func prepareForSegue(segue: UIStoryboardSegue, sender:AnyObject?) {
var dest : Levels = segue.destinationViewController as Levels
if(segue.identifier == "segue1") {
//set your customized level values here...
//ie., dest.level = 1
}
else if(segue.identifier == "segue2") {
//set your customized level values here...
}
else if(segue.identifier == "segue3") {
//set your customized level values here...
}
}
Related
NOTE: Question has been edited in an attempt to be more clear with my issue.
Hey, I am trying to pass data through multiple VCS. I want to pass data (arrays) from V2 -> V3 and then V3 -> V1 but I want to be able to only navigate through the VCs as such: V1 - V2 - V3 and V3 - V2 - V1.
So what I need to learn is how to pass data without navigating to a different VC as well as setting up two preparetosegue methods to pass data between V2 -> V3 and V3 -> V1 while also being able to navigate between all VCs. When I create my first preparetosegue, I am unable to use other segues associated in my VC to navigate to other VCs without getting a Fatal Error.
Can anyone help me?
Any input would be greatly appreciated!
Heres my attempt:
import UIKit
class ViewController: UIViewController {
var name = String()
var StopButInfo = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
import UIKit
class SecondViewController: UIViewController {
var StringArray = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBOutlet var PHeight: UITextField!
#IBOutlet var PName: UITextField!
#IBAction func Search(_ sender: Any) {
if PHeight.text != ""{
performSegue(withIdentifier: "SearchSegue", sender: self)}
let CDstart = String(describing: Date())
StringArray.append(CDstart)
StringArray.append(PName.text!)
StringArray.append(PHeight.text!)
}
override func prepare(for SearchSegue: UIStoryboardSegue, sender: Any?){
let thirdController = SearchSegue.destination as! ThirdViewController
thirdController.SearchButInfo = StringArray
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
import UIKit
class ThirdViewController: UIViewController {
var height = String()
var SearchButInfo = [String]()
var StringArray = [String]()
#IBAction func Stop(_ sender: Any) {
if StringArray.count != 0{
performSegue(withIdentifier: "SegueToStart", sender: self)
}
let CDStop = String(describing: Date())
StringArray.append(CDStop)
StringArray.append(height)
}
override func prepare(for SegueToStart: UIStoryboardSegue, sender: Any?){
let firstController = SegueToStart.destination as! ViewController
firstController.StopButInfo = StringArray}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
You need to check which view controller's segue is about to be performed, this can be done like this inside prepare(for segueMVH: UIStoryboardSegue, sender: Any?) method:
if let firstController = segueMVH.destination as! FirstViewController {
// Set first view controller's data
} else if let secondController = segueMVH.destination as! SecondViewController {
// Set second view controller's data
} else if let thirdController = segueMVH.destination as! ThirdViewController {
// Set third view controller's data
}
Note: It's better to use a different identifier for each segue to be able to distinguish between them.
The error you got on let secondController = segueMVH.destination as! ThirdViewController is saying that you are casing HC.ViewController into ThirdViewController and that's why it failed. It means that the destination view controller of your segue is not ThirdViewController.
To further help you understand segue: A segue is a connection between a source view controller and a destination view controller and can be only used between them two. See this picture:
In this case, I have a segue connection in my storyboard connected between my VC1's button and VC2. In this case, my button click will trigger this segue and prepare(for segue) method can only be in VC1 where it passes data to VC2.
So in your situation, you believe that the destination of your segue is ThirdViewController but it's actually not. So please check your segue with identifier segueMVH to see if it is connected between your current view controller and your ThirdViewController.
Hope this helps
Since i'm new and a newbie on Swift can someone tell me how I can get the label value on screen 1 to show on screen 2. Thanks
Edit: So I tried the way you told me but for some reason the Label text did not change in View 2. Any help? Thanks
I am passing textFiled data to destViewController to show how segue performs when passing data.
Note: If you want to pass string data to your destVC.You can assign your string like var someValue: String
mainStoryBoard:
MainVC:
#IBOutlet weak var textField: UITextField!
//or you can assign string like var someValue: : String
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let viewController = segue.destination as! destVC
viewController.dataText = textField.text // someValue.text
}
DestVC:
#IBOutlet var label: UILabel!
var dataText = String()
override func viewDidLoad()
label.text = dataText
}
Output:
You already have a segue between ViewController1 and ViewController2 it seems, so now you just need to pass some date from one to another. This can be done in the function prepare(for segue: UIStoryboardSegue, sender: AnyObject?) which is called when you transition from ViewController1 to ViewController2.
The UIStoryboardSegue class has a property called source of type UIViewController and another property called destination which is also a UIViewController.
So, if you define a property on your ViewController2, like so:
var labelValue: String
Then you can pass a value to it in your prepareForSegue defined on ViewController1 like so:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let viewController2 = segue.destination as? YourViewController2 else {
return
}
viewController2.labelValue = theValueFromViewController1
}
Here is tutorial telling you a bit more (in Objective C though)
And this is also a fine introduction.
Hope that helps you.
I'll consider you have ViewController class VC1 (screen 1) & ViewController class VC2 (screen 2). I see from the screenshot that, you're already using a segue to go from the VC1 to VC2 view.
Now, declare a variable in your VC2 class let's call it labelValue,
class VC2 {
var labelValue: String?
...
}
Whenever you use a storyboard segue to move from one viewcontroller's view to other viewcontroller's view a method named,
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
will get called if it's overriden in the source viewController class (scene1 in your case). In this method you'd be able to access the destination view controller (scene 2) and it's properties. So for your case you can implement it like this,
class VC1 {
//I have assumed the below label will hold the value which you want to pass it to the scene 2.
var lblResult: UILabel!
......
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// You can access the VC2 instance from the segue
if let vc2 = segue.destinationViewController as? VC2 {
vc2.labelValue = lblResult.text
}
}
Now once you implement the prepareForSegue: method correctly as shown above, you'd be able to get the label's value from scene 1 to labelValue property of scene2.
Do learn more about segues here : More About Segues and Storyboards here.
================================
Edit:
Coming to your edited question, in your View2 viewController, you've declared labelNumber1 as String and not as UILabel, so whenever you pass the value to labelNumber1, the value will be containing in this variable and it will not be shown in the screen since it is just a normal string. So what you can do is, declare the labelNumber1 as UILabel
class View2: UIViewController {
#IBOutlet var labelNumber1: UILabel!
.....
}
and in your prepare for segue in ViewController1 make the following change,
class ViewController1: UIViewController {
.....
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// You can access the VC2 instance from the segue
if let view2 = segue.destinationViewController as? VC2 {
view2.labelNumber1.text = lblResult.text
}
}
However if you still want to keep labelNumber1 as String, and to verify whether the value has been passed from ViewController1 during segue, add below line to viewDidLoad() of View2 ViewController.
class View2: UIViewController {
.....
override func viewDidLoad() {
super.viewDidLoad()
print("labelNumber1: \(labelNumber1)")
}
}
And you can see the printed value of labelNumber1 in the console.
HTH :)
I have been learning swift and have made the foundation of most of my app. I have the following storyboard
app storyboard
Everything works fine. For example, I have an unwind segue on the add course view controller that triggers when you press save and you are returned to the 'your courses' view controller.
When you are on the my courses view controller, you can select a course and the topics are displayed, you can then select a topic and you are taken to an update score view controller, this all works fine.
However, my problem is this. I want to make it so that when you select save in the updatescore view controller, an unwind segue is triggered (the same as in the add course) and you are returned to the list of topics in the topics view controller.
However, I have followed many tutorials and obviously got it working before. (My action method for the unwind segue is in the correct topics view controller) but when i press save, the unwind segue is not returning me to the topics view controller.
Could anyone suggest a reason for this? I have spent a lot of time trying to find an answer and gone through many tutorials but have not managed to solve it.
I have also included a screen shot of the connections of the triggered segues for my save button to show that it is set up. Showing triggered segue for save button
i have the following code in the update score view controller
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if saveButton === sender {
print("save button selected")
}
}
But even this is not getting triggered when I click on save.
Many thanks
UPDATE:
After following Ronatorys advice My view controller for the update score is as follows but it is still not working:
import UIKit
class UpdateScoreTableViewController: UITableViewController {
#IBOutlet weak var topicGettingUpdated: UITextField!
#IBOutlet weak var newScore: UITextField!
#IBOutlet weak var saveButton: UIBarButtonItem!
var index:Int?
var Topics:[String]!
var TopicToUpdate:String?
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
guard let uiBarButtonItem = sender as? UIBarButtonItem else {
print("There is no UIBarButtonItem sender")
return
}
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if indexPath.section == 0 && indexPath.row == 0 {
newScore.becomeFirstResponder()
}
tableView.deselectRowAtIndexPath(indexPath, animated: true)
}
}
But the prepare for segue is not even getting triggered.
Like Craig in the comments said, it's not that easy to find the problem. So I just build a simple app where you can follow the steps as guide and see if you forgot something to setup the functionality right. Hope it will help you. Note: Code is in Swift 3.0, but should be easy to adopt to 2.*
1. Storyboard with two View Controllers:
2. Declare the action method for the unwind segue in the FirstViewController.swift:
class FirstViewController: UIViewController {
// action method for the unwind segue
#IBAction func updateScore(_ segue: UIStoryboardSegue) {
print("Back in the FirstViewController")
}
}
3. Connect the Save button in the Storyboard with the action method (with ctrl + drag):
4. Connect your Save button with the SecondViewController.swift file, to use it for checking in your prepareSegue method (with ctrl + drag):
5. Add the prepare(for:sender:) method to your SecondViewController.swift:
class SecondViewController: UIViewController {
#IBOutlet weak var saveButtonPressed: UIBarButtonItem!
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// check safely with guard that your save button is the sender and you can use it
// if not print message
guard let uiBarButtonItem = sender as? UIBarButtonItem else {
print("There is no UIBarButtonItem sender")
return
}
// check if you selected the save button
if saveButtonPressed == uiBarButtonItem {
print("save button selected")
}
}
}
Result:
The sample app you can find here
I did not manage to get the unwind segue to work but instead used
navigationController!.popViewControllerAnimated(true)
as a work around and this works fine.
when I am selected button twice will open a new page.
//////
Main viewController
var Country = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func taxiAction(sender: AnyObject) {
let opt = ["1","2","3","4","5"]
Country = opt
performSegueWithIdentifier("viewPlaceSegu", sender: sender)
}
...
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// get a reference to the second view controller
if segue.identifier == "viewPlaceSegu" {
if let secondViewController = segue.destinationViewController as? TableViewPlace {
// set a variable in the second view controller with the String to pass
secondViewController.tnt = Country as! [String]
}
}
}
////
http://i.stack.imgur.com/LKrN7.jpg
I tried so but didn't realize problem .
Does anyone know about this? :)
A likely cause is that you have connected the segue from the button to the new ViewController in the storyboard. When the button is pressed it will load the segue created in storyboard as well as the one created programatically.
If this is the cause then you would just need to delete the storyboard segue and create a new one from the ViewController rather than from the button.
I'm developing an app for iPad Pro. In this app, containerView use to add additional views and interact with them.
First, I created a protocol:
protocol DataViewDelegate {
func setTouch(touch: Bool)
}
Then, I created my first view controller
import UIKit
class ViewController: UIViewController, DataViewDelegate {
#IBOutlet var container: UIView!
#IBOutlet var labelText: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
func setTouch(touch: Bool) {
if touch == true {
labelText.text = "Touch!"
}
}
}
And finally, I created a view that will be embedded in containerView.
import UIKit
class ContainerViewController: UIViewController {
var dataViewDelegate: DataViewDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func touchMe(sender: AnyObject) {
dataViewDelegate?. setTouch(true)
}
}
But for some reason, nothing happened, the first view controller receives nothing in setTouch function.
My question is: In this case, using container, how can I make the communication between two ViewsControllers?
Like #nwales said you haven't yet set the delegate. You should do set the delegate in prepareForSegue function on your first viewController (who contain the viewContainer)
First select the embed segue and set an identifier in the attributes inspector.
Then in the parentViewController implement the func prepareForSegue like this:
Swift 4+:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "the identifier") {
let embedVC = segue.destination as! ViewController
embedVC.delegate = self
}
}
Below:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
if (segue.identifier == "the identifier") {
let embedVC = segue.destinationViewController as! ContainerViewController
embedVC.dataViewDelegate = self
}
}
Looks like you defined the delegate, but have not set the delegate. This happens to me all the time.