I am trying to create an Unwind segue that brings from the DetailViewcontroller to the SecondViewcontroller.
I have created an IBAction like this one that can be intercepted by Segues :
#IBAction func segueToSecondVC(sender: UIStoryboardSegue) {
print("segue intercepted by IBAction segueToSecondVC")
}
An placed it in the receiver ViewController (secondViewController).
Then I moved to the Detailviewcontroller and clicked to the third figure on the top of the viewcontroller (exit),clicked to the segueToSecondVC IBAction that appeared in the list of events and dragged it into the button "TURN BACK"(placed in the Detailviewcontroller) in order to associate the button to the event.
In this way the button should be connected with the event and should turn back to the secondVC with an automatic Hidden Segue.
But it doesn't work, the simulator crash and I am redirected to xCode editor with an error in the Appdelegate that says "Thread 1: signal SIGABRT"
I don't know why it doesn't work, anyone could help me?
you can use Unwind like this:
#IBAction func prepareForUnwind(segue: UIStoryboardSegue){}
#IBAction func closePressed(_ sender: Any) {
performSegue(withIdentifier: "unwindToAnotherVC", sender: nil)
}
good rule, is to add all your segues names to constants file:
Create swift file
import Foundation
// Segues
let TO_LOGIN = "toLogin"
let TO_CREATE_ACCOUNT = "toCreateAccount"
let UNWIND = "unwindToChannel"
and then use UNWIND in
#IBAction func closePressed(_ sender: Any) {
performSegue(withIdentifier: UNWIND, sender: nil)
}
Related
Learning some view controller basics and am stuck on how to dismiss a modal with a button.
In my slimmed-down example, I have a two view setup with the initial view and the modal. The first view has a button that successfully pops up the modal. On the modal, there is a button that should dismiss itself.
According to other posts and documentation, I should be able to run simple code attached to the button like this:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func CloseModal(_ sender: Any) {
self.dismiss(animated: true, completion: nil)
}
}
When I tap the "Close Modal" button nothing happens. What am I missing here? Am I putting this code in the wrong place? Currently, it's in the main ViewController.swift file.
The other approach is to use an unwind segue to your main view controller. Just add an “unwind action” in the first view controller:
class ViewController: UIViewController {
#IBAction func unwindHome(_ segue: UIStoryboardSegue) {
// this is intentionally blank
}
}
Just give this unwind action a meaningful name, unwindHome in this example, so that, if and when you have multiple unwind actions later on, you can easily differentiate between them.
Then you can control-drag from the button in the second scene to the “exit” control and select the appropriate unwind action:
This has a few nice aspects:
The “close” button no longer cares how you presented it, it will unwind however is appropriate (e.g. if you later change the initial segue to be a show/push segue, the unwind segue will still work without any code changes).
Because you’re now using a segue to unwind, the presented view controller can use its prepare(for:sender:) to send data back, should you eventually need to do that.
If you want, you can unwind multiple scenes. For example if A presents B, and B presents C, you can obviously unwind from C to B, but you can also unwind all the way from C to A if you want.
So, while dismiss works, unwind segues are another alternative.
You actually have two ViewController screens, but it looks like you have one ViewController class? And is the 2nd screen connected to a class?
Must be in the class that belongs to the second screen of the closeModal method.
//This is First ViewController, OpenModal Button is here
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
// The name of the class and the Viewcontroller in the storyboard have to be the same, and CloseModol Button and function need to be here
class SecondViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func CloseModal(_ sender: Any) {
self.dismiss(animated: true, completion: nil)
}
}
Don't forget to set the name of the ViewController in Storyboad;
from FirstViewController to SecondViewController
I have a set of storyboards under the UINavigation Controller. One of these screens contains a table view and I need to send the data of the clicked row to the next screen. I am aware that doing so would require me to use segue. But then how do I get the Navigation Bar and the Navigation Button
For better understanding I have uploaded the screen shot of my first screen. Clicking on the detail button is going to send the challenge object to next screen. However, I am looking forward to having the same navigation bar on the top of the next scree. Any idea how can I accomplish such objective?
Currently if I press on details button, I'll get the details of that challenge in the terminal.
#IBAction func CAStartChallenge(_ sender: UIButton) {
let tag = NSNumber(value: sender.tag) as! Int
print("challenge name to be printed : \(challengeTableConent[tag].display()) ")
}
In your storyboard you want to drag a segue between the view controllers, like so:
Storyboard segue dragging
Use either Show or Push (deprecated) options for the segue. Give this segue an appropriate identifier, such as Details.
Then in your button function you can add these:
#IBAction func CAStartChallenge(_ sender: UIButton) {
let tag = NSNumber(value: sender.tag) as! Int
performSegue(withIdentifier: "Details", sender: challengeTableConent[tag])
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "Details",
let destination = segue.destination as? DestinationViewController,
let model = sender as? ChallengeTableContentType {
// pass through model to destination view controller
destination.model = model
}
}
You can then configure the destination view controller using its specific model when it appears.
First of all
Passing data through screens using segues is simple. Just check this answer
Pass data through segue
It will explain exactly how to do it
Second
Check the bug on your button I think you mean "Details"
Third
Check the type of segue, you might not used push or show detail. Also select the details view and make sure that "Simulated Metrics -> Topbar" is set to inferred
Some prints to help
This will ensure that the navigation bar comes from the previous controller
This is how your segue should look, do not forget to give an identifier to your segue
I want to open an other view controller, after checking if it is the first run of the app.
It works when I press a button but not when I call the method openMap
class TutorialController: UIViewController {
override func viewDidLoad() {
//check if the app opens for the first time
if(UserDefaults.standard.bool(forKey: "HasLaunchedOnce"))
{
// app already launched
print("not first launch")
openMap()
}
else
{
// This is the first launch ever
UserDefaults.standard.set(true, forKey: "HasLaunchedOnce")
UserDefaults.standard.synchronize()
print("first launch")
openTutorial()
}
}
func openTutorial(){
}
#IBAction func openMap(){
print("openmap opened")
performSegue(withIdentifier: "openMap", sender: nil)
}
}
I assume, you've connected your button to #IBAction func openMap()
if so, you should not call openMap() action inside your viewDidLoad, but use the same code performSegue(withIdentifier: "openMap", sender: nil) instead in your viewDidAppear:
if(UserDefaults.standard.bool(forKey: "HasLaunchedOnce"))
{
// app already launched
print("not first launch")
performSegue(withIdentifier: "openMap", sender: nil)
}
...
If it doesn't work, you've probably made a mistake with creation of your segue and have connected Button to the destination ViewController directly in your storyboard instead of connecting two controllers:
If so, just remove the old segue, and re-crete it in the way as it is on the image above and assign the same segue id "openMap"
EDITED:
Please, move performing of your segue to the viewDidAppear instead of viewDidLoad, because viewDidLoad is called when the ViewController object is created and it's not yet attached to the window.
Ok, from what I understand is that you want to perform a segue "openMap" when it HasLaunchedOnce. Well what you're doing wrong is that you're calling an #IBAction func. This is my suggestion
if you still want to have that button
create a function and name if whatever you want. Inside this function perform this segue. Link this function to the if else statement and the button.
eg:
//if else statement
if(UserDefaults.standard.bool(forKey: "HasLaunchedOnce"))
{
// app already launched
print("not first launch")
anotherFunction()
}
//#ibaction (scrap this if you don't want the button)
#IBAction func openMap()
{
print("openmap opened")
anotherFunction()
}
//another function
func anotherFunction()
{
performSegue(withIdentifier: "openMap", sender: nil)
}
hope this helps
I am creating an application in which there are 6 view controller in storyboard. The thing is that data is shared between the default view controller and the first one ( say A and B) which i added. i am using the prepareforseque method for passing data. the problem started when i added two more view controller. lets say C and D i created two new swift files and changed the two view controller class name. i created a textbox and button in C and label in D. when i pressed the button, the value of the text field is not passing into the D view controller although i used the same methods and code which i used for A and B. do i have to do anything else when i want to pass data between two newly added view controller.
first viewcontroller in which when a button is pressed value 1 needed to be passed:
class PlaySelectMenu: UIViewController {
var value = Int()
#IBAction func twotofive(sender: AnyObject) {
value = 1
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let nextView : PlayGameView = segue.destinationViewController as! PlayGameView
nextView.x = value
}
}
the second view controller which receive the value and print it
import Foundation
import UIKit
class PlayGameView: UIViewController{
var x = Int()
override func viewDidLoad() {
super.viewDidLoad()
print(x)
}
}
here i have added both the view controller from the object library and not working with the default one which is present in storyboard by default. i dont know why these two viewcontroller are not working. please help.
Regards Dev
One solution would be to write the data out to NSUserDefaults and then read it back from NSUserDefaults in the other view controller. Probably not the proper or correct way to share data between two view controllers, but it's been a reliable work around for me.
Other than that, you'd need to share your code so that we can see what's occurring.
Can you post also the code in your controllers C & D. And also if you have copy/paste the code inside your first two controllers into the two others, are you sure that in your prepareForSegue method you have changed the name of the destination segue ?
Assuming you have created the segue in Storyboard:
All you need is to do is put all of needed updates in prepareForSegue because twotofive is called after prepareForSegue.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
value = 1
let nextView : PlayGameView = segue.destinationViewController as! PlayGameView
nextView.x = value
}
Since you have connected your segue from button click to view controller, when you press button segue is automatically called. Instead of connecting segue from button to VC, connect VC to VC. Then in button click method at the last add below line:
#IBAction func twotofive(sender: AnyObject) {
value = 1
self.performSegueWithIdentifier("<Name of the segue identifier>", sender: self)
}
This will call your prepareForSegue. If you are calling more then one VC using segue from a VC then you can use segue.identifier to check which VC was called as below
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
if segue.identifier == "CVC" {
}
I am trying to use the performSegueWithIndentifier function to to create a segue from one ViewController to the next. But, when I press the button with the UITApGestureRecognizer connected to it, the View shifts to the debugger panel.
Here is the error it is displaying:
ContaminateTargetViewController: has no segue with identifier 'showMasterChemistryViewController'
(I cut out the personal Info)
Here is the ViewControllers Class:
import Foundation
import UIKit
class ContaminateTargetViewController: UIViewController {
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showMasterChemistryViewController" {
let chemistryMasterViewController = segue.destinationViewController as! ChemistryMasterViewController
}
}
#IBAction func showPlaylistDetail(sender: AnyObject) {
performSegueWithIdentifier("showMasterChemistryViewController", sender: sender)
}
}
I also previously had to manual segues from the 2 buttons I have on the ViewController and recently deleted them to switch over to the UITapGestureRecognizer for the convenience. I am wondering if I have an error in my code that I do not see or if previously deleting the manual segues from the View is causing this error. If the problem is rooting from the previously deleted manual segues please tell me how to fix this in your error. If the problem is rooting form the code, please leave the code I should add, delete, or substitute.
Any suggestions or input is greatly appreciated.
Thanks in advance.
This error is called when you do not have the requested segue connected to your view controller. Are you sure that you have the two view controllers connected via a segue named "showMasterChemistryViewController" on your storyboard?