Is there a way to have one button unwind back to a specific view controller? For example suppose I have ViewController A and B. Both modally segue to ViewController C. Now I understand how to segue unwind back to one of the previous view controllers (As was explained here) but how do I go back to the specific view controller that presented VC C?
So to sum it up, what I'm trying to figure out is...
If A segued to C then I want to unwind back to A when the button is selected. If B segued to C then I want to unwind back to B when the button is selected.
You should use the standard way to return from a modal segue. Put this in your 'back' button...
[[self presentingViewController] dismissViewControllerAnimated:YES];
This doesn't use the storyboard or a segue for the return, just code.
You could use the presentingViewController 'title' property to steer the unwind process to the desired originating ViewController. This solution would also allow you to pass data from your ViewController C to ViewControllers A and B.
1) Select the View Controller button (the yellow one) at the top of the storyboard canvas of ViewController A.
2) In the Attributes Inspector (View Controller section) give ViewController A a title.
3) Include the following code in ViewController A:
#IBAction func returned(segue: UIStoryboardSegue) {
// Don't need any code here
}
4) Repeat steps 1, 2 and 3 for ViewController B.
5) Override the prepareForSegue function in ViewController C as follows:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if self.presentingViewController!.title! == "ViewControllerATitle" {
let destination = segue.destinationViewController as! ViewControllerA
destination.someFunction(someArgument)
}
else if self.presentingViewController!.title! == "ViewControllerBTitle" {
let destination = segue.destinationViewController as! ViewControllerB
destination.someFunction(someArgument)
}
}
Related
Lets say I have two UIViewControllers, we'll call them VC1 and VC2. VC1 performs a segue that then goes to VC2, and VC2 has a close button that will unwind that segue back to VC1.
So normally, if I'm wanting to make a custom UIStoryboardSegue I would make a segue from VC1 to VC2 and then select custom and use my custom UIStoryboardSegue I made that and I have it working just fine.
And for the close button I would put in code in the destination UIViewController (VC1) like this:
#IBAction func prepareForUnwind(unwindSegue: UIStoryboardSegue) {
//some code
}
Then on the UIViewController with the close button, I would ctr + drag up to the EXIT and select that unwind prepareForUnwind. Then I'd select the UnwindSegue on the left panel and change the class to my unwind class.
The problem is, in my case I am having to create that button with code, so I don't have the option of ctr + drag. So how do I connect it to the exit and then assign the class for the unwind segue with code only? I've tried googling it, but everything keeps coming back with the method when you are using the storyboard.
I can include more code if necessary, just let me know.
You can connect your button in this way:
First Step
In the Storyboard connect with drag and drop your source view controller name icon with the exit icon, there you should see in the pop-up your prepareForUnwind function.
Then you can set for your unwind segue an identifier.
Second step
Add an #IBAction function for your close button and perform the segue:
#IBAction func closeAction() {
performSegue(withIdentifier: "yourExitIdentifier", sender: self)
}
I am trying to present two view controllers. I'm trying to avoid presenting one after the other as this doesn't give a good user experience.
I'm using storyboards / segues to present the view controllers, each embedded in navigation controllers.
The behaviour should be:
View Controller 1 presents view controller 2 - but when view controller 2 dismisses I'd like view controller 3 to be the one showing to the user. And ideally an ability to also dismiss to view controller 1.
I understand I can accomplish this with child views. But I'd ideally like to learn how it can be done by manipulating the navigation stack.
I don't think you can do what you want with segue, but certainly you can do it with a little code...
This will (on a button tap, for example) perform a standard slide-in navigation controller animation directly from the current ViewController (call it vc1) to ViewController2, but "insert" ViewController3 into the stack. Tapping the Back button will take you from vc2 to vc3 to vc1.
#IBAction func didTap(_ sender: Any) {
guard let vc3 = storyboard?.instantiateViewController(withIdentifier: "vc3"),
let vc2 = storyboard?.instantiateViewController(withIdentifier: "vc2")
else { return }
let vcArray = [self, vc3, vc2]
self.navigationController?.setViewControllers(vcArray, animated: true)
}
If you want to go from vc2 back to vc1 and "skip over" vc3, in vc2 add (on a button tap, for example):
#IBAction func backToStartTap(_ sender: Any) {
self.navigationController?.popToRootViewController(animated: true)
}
As best to my understanding about your question, try out below method:
Present VC 3 from VC 1 and from VC 3 present VC 2 immediately(This can be done by putting the viewController present code in the ViewDidLoad() of VC 3).
So when you dismiss VC 2, VC 3 will be shown and on dismissing VC 3 , you will be redirected to VC 1.
VC means ViewController.
Presenting viewController in the ViewDidLoad() is really a bad idea.
You can present VC3 and add VC1.view and VC2.view as a subview of VC3's view and later you can remove VC1.view and VC2.view as you want and behaviour will be same as you are expecting.
You need to set your the viewcontroller you are going to present .modalPresentationStyle as .currentContext, and you need to set your current viewcontroller .definesPresentationContext as false
In viewController1, I have a CollectionView and used the following code to create a segue to the selected item page.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "ToEventInfoSegue") {
let destination = segue.destination as! ViewController2
let cell = sender as! CollectionViewCell
destination.eventInfo = cell.anEvent!
destination.MainVC = self
}
}
Since the viewController2 is not currently embedded in a navigation controller, after the segue push, there is no navigation bar.
My question is in order to get the navigation bar, how do I implement the segue when the VC2 is embedded in a navigation controller?
Update
Tab Bar Controller -> Navigation Bar Controller -> VC1
VC1 -> (Currently no navigation bar controller) -> VC2
Update 2
After resetting the segue, I was able to get a navigation bar in StoryBoard. However, it seems that it is covered by the view. The navigation bar is not showing up. The back button does show up. I think the title is somehow on the bottom of the layer. The hierarchy looks like this.
The blue area is where the title of Navigation Bar is. However, as you can see it is covered and does not show when I run the app. The back button does show up
Based on your question what i understand is you need NavigationBar in your DetailViewController so for that you have to assign segue to your CollectionViewCell with DetailViewController like below screen shot.
I guess your storyboard flow like this:
What you need is assign segue from Cell to DetailViewController:
By doing this you can get your NavigationBar in your detail screen.
Hope this will help you to slove your problem.
I'm working on this tutorial, which shows how to create an app with storyboards. My viewController has two UIButtons and I have connected a segue to those UIButtons. These segues push a new viewController.
Now I am looking for a way to cancel this segue if a certain condition becomes true. When I used the old xib files to create my interface I was able to do something like this:
-(IBAction)sendButton:(id)sender {
if(TRUE) {
// STOP !!
}
}
This does not work anymore. How can I cancel the push of the new viewController?
Nope. You can't cancel segues that are directly linked to interface elements like your UIButton.
But there is a workaround.
Remove the segue that is linked to the button
Add a segue from the viewController (the one with the button) to the viewController that should be pushed. This must be a segue that is not connected to a interface element. To do this you can start the segue from the status bar. Or create the segue in the left sidebar.
Select this segue, open the attributes inspector and change the Identifier of the segue (e.g. PushRedViewController)
Select Xcodes assistant view, so you can see the .h file of the viewController with the button.
Connect the button to an action. To do this select the button and control-drag to the .h file. Select action in the menu and name your action (e.g. redButtonPressed:)
Open the implementation of your viewController
change the action from step 5 to something like this:
- (IBAction)redButtonPressed:(id)sender {
[self performSegueWithIdentifier:#"PushRedViewController" sender:sender];
}
You can actually do this by adding following method into your code
- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender {
if([identifier isEqualToString:#"btnSegue"])
{
return YES;
}
else{
return NO;
}
}
Lets assume your segue is btnSegue.And if you need the segue to be performed based on some condition you can have following code
if(check)
{
[self performSegueWithIdentifier:#"btnSegue" sender:self];
}
Where check is BOOL which you can set true or false based on your condition.
As you know, a UISplitViewController has one root controller and one detail view controller only, but I want to use another detail view controller.
When I select the list items from the root controller (popover controller), the selection should fire different detail views -- i.e., row1 fires detail view1, row2 fires detail view2 and a button item fires detail view3, etc.
How can I achieve this?
That project from Apple is from 2012 and doesn't use storyboards. If you are looking for a non-storyboarded solution, it will work fine but in Xcode 6 you should be taking advantage of the new Show Detail segue in storyboards.
Here's a quick example project that shows how to use multiple detail view controllers on the same split view by using the Show Detail segue from the Master View Controller.
There's a project from Apple that covers exactly what you need. MultipleDetailViews
This sample shows how you can use UISplitViewController to manage
multiple detail views.
The application uses a split view controller with a table view
controller as the root view controller. When you make a selection in
the table view, a new view controller is created and set as the split
view controller's second view controller.
The root view controller defines a protocol
(SubstitutableDetailViewController) that detail view controllers must
adopt. The protocol specifies methods to hide and show the bar button
item controlling the popover.
In Swift
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let storyBoard = UIStoryboard(name: "Main", bundle: nil)
let imageGalleryVC = storyBoard.instantiateViewController(withIdentifier: "ImageGallerySID") as! ImageGalleryViewController
splitViewController?.showDetailViewController(imageGalleryVC, sender: nil)
}
I know this is a late post as this was asked 6 years ago and active last year.
But there is a way to have multiple detail views for a split view controller.
By embedding each detail controller into its own navigation controller and linking from the master view to each using the 'show detail' segue, you are able to achieve this result of switching between views by using an identifier associated and then from the master view function 'didSelectRowAt' selecting a row is where you can select which detail view you wish to see.
if indexPath.row == 0 {
performSegue(withIdentifier: "secondView", sender: self)
}
if indexPath.row == 1 {
performSegue(withIdentifier: "thirdView", sender: self)
}