Creating a segue programmatically

Question

I have a common UIViewController that all my UIViewsControllers extend to reuse some common operations   I want to set up a segue on this  Common  UIViewController so that all the other UIViewControllers inherit    I am trying to figure out how do I do that programmatically   I guess that the question could also be how do I set a segue for all my UIViewControllers without going into the story board and do them by hand

User · Answer

For controllers that are in the storyboard.

jhilgert00 is this what you were looking for?

-(IBAction)nav_goHome:(id)sender {
UIViewController *myController = [self.storyboard instantiateViewControllerWithIdentifier:@"HomeController"];
[self.navigationController pushViewController: myController animated:YES];

}

OR...

[self performSegueWithIdentifier:@"loginMainSegue" sender:self];

User · Answer

You have to link your code to the UIStoryboard that you re using  Make sure you go into YourViewController in your UIStoryboard  click on the border around it  and then set its identifier field to a NSString that you call in your code   UIStoryboard  storyboard    UIStoryboard storyboardWithName   MainStoryboard                                                        bundle nil   YourViewController  yourViewController      YourViewController       storyboard instantiateViewControllerWithIdentifier   yourViewControllerID     self navigationController pushViewController yourViewController animated YES

User · Answer

First of  suppose you have two different views in storyboard  and you want to navigate from one screen to another  so follow this steps   1   Define all your views with class file and also storyboard id in identity inspector   2   Make sure you add a navigation controller to the first view  Select it in the Storyboard and then Editor  Embed In   Navigation Controller  3   In your first class  import the  secondClass h    import  ViewController h  import  secondController h    4   Add this command in the IBAction that has to perform the segue  secondController  next  self storyboard instantiateViewControllerWithIdentifier   second     self navigationController pushViewController next animated YES     5     second  is secondview controller class  storyboard id

User · Answer

By definition a segue can t really exist independently of a storyboard   It s even there in the name of the class  UIStoryboardSegue   You don t create segues programmatically - it is the storyboard runtime that creates them for you   You can normally call performSegueWithIdentifier  in your view controller s code  but this relies on having a segue already set up in the storyboard to reference   What I think you are asking though is how you can create a method in your common view controller  base class  that will transition to a new view controller  and will be inherited by all derived classes   You could do this by creating a method like this one to your base class view controller   -  IBAction pushMyNewViewController       MyNewViewController  myNewVC     MyNewViewController alloc  init           do any setup you need for myNewVC       self presentModalViewController myNewVC animated YES       and then in your derived class  call that method when the appropriate button is clicked or table row is selected or whatever

User · Answer

I ve been using this code to instantiate my custom segue subclass and run it programmatically  It seems to work  Anything wrong with this  I m puzzled  reading all the other answers saying it cannot be done   UIViewController  toViewController    self storyboard instantiateViewControllerWithIdentifier   OtherViewControllerId    MyCustomSegue  segue     MyCustomSegue alloc  initWithIdentifier     source self destination toViewController    self prepareForSegue segue sender sender    segue perform

User · Answer

A couple of problems  actually   First  in that project you uploaded for us  the segue does not bear the  segue1  identifier   no identifier  You should fill in that identifier if you haven t already   Second  as you re pushing from table view to table view  you re calling initWithNibName to create a view controller  You really want to use instantiateViewControllerWithIdentifier

User · Answer

well   you can create and also can subclass the UIStoryBoardSegue   subclassing is mostly used for giving custom transition animation   you can see video of wwdc 2011 introducing StoryBoard  its available in youtube also   http   developer apple com library ios  documentation UIKit Reference UIStoryboardSegue Class Reference Reference html   apple ref occ cl UIStoryboardSegue

User · Answer

I reverse-engineered and made an open source  re implementation of UIStoryboard s segues  https   github com acoomans Segway  With that library  you can define segues programmatically  without any storyboard    Hope it may help

User · Answer

I d like to add a clarification     A common misunderstanding  in fact one that I had for some time  is that a storyboard segue is triggered by the prepareForSegue sender  method  It is not  A storyboard segue will perform  regardless of whether you have implemented a prepareForSegue sender  method for that  departing from  view controller    I learnt this from Paul Hegarty s excellent iTunesU lectures  My apologies but unfortunately cannot remember which lecture   If you connect a segue between two view controllers in a storyboard  but do not implement a prepareForSegue sender  method  the segue will still segue to the target view controller  It will however segue to that view controller unprepared   Hope this helps

User · Answer

Here is the code sample for Creating a segue programmatically   class ViewController  UIViewController                  1  Define the Segue     private var commonSegue  UIStoryboardSegue              override func viewDidLoad                            2  Initialize the Segue         self commonSegue   UIStoryboardSegue identifier   CommonSegue   source       destination                     self commonSegue source showDetailViewController self commonSegue destination  sender  self                                          override func prepare for segue  UIStoryboardSegue  sender  Any                4  Prepare to perform the Segue         if self commonSegue    segue                                                           func actionFunction                3  Perform the Segue         self prepare for  self commonSegue  sender  self          self commonSegue perform

User · Answer

I thought I would add another possibility  One of the things you can do is you can connect two scenes in a storyboard using a segue that is not attached to an action  and then programmatically trigger the segue inside your view controller  The way you do this  is that you have to drag from the file s owner icon at the bottom of the storyboard scene that is the segueing scene  and right drag to the destination scene  I ll throw in an image to help explain       A popup will show for  Manual Segue   I picked Push as the type  Tap on the little square and make sure you re in the attributes inspector  Give it an identifier which you will use to refer to it in code      Ok  next I m going to segue using a programmatic bar button item  In viewDidLoad or somewhere else I ll create a button item on the navigation bar with this code   UIBarButtonItem  buttonizeButton     UIBarButtonItem alloc  initWithTitle   Buttonize                                                                      style UIBarButtonItemStyleDone                                                                    target self                                                                    action  selector buttonizeButtonTap     self navigationItem rightBarButtonItems     buttonizeButton     Ok  notice that the selector is buttonizeButtonTap   So write a void method for that button and within that method you will call the segue like this   - void buttonizeButtonTap  id sender       self performSegueWithIdentifier   Associate  sender sender           The sender parameter is required to identify the button when prepareForSegue is called  prepareForSegue is the framework method where you will instantiate your scene and pass it whatever values it will need to do its work  Here s what my method looks like   -  void prepareForSegue  UIStoryboardSegue   segue sender  id sender       if    segue identifier  isEqualToString   Associate                  TranslationQuizAssociateVC  translationQuizAssociateVC    segue destinationViewController           translationQuizAssociateVC nodeID   self nodeID    --pass nodeID from ViewNodeViewController         translationQuizAssociateVC contentID   self contentID          translationQuizAssociateVC index   self index          translationQuizAssociateVC content   self content            Ok  just tested it and it works  Hope it helps you

User · Answer

Storyboard Segues are not to be created outside of the storyboard  You will need to wire it up  despite the drawbacks   UIStoryboardSegue Reference clearly states      You do not create segue objects directly  Instead  the storyboard   runtime creates them when it must perform a segue between two view   controllers  You can still initiate a segue programmatically using the   performSegueWithIdentifier sender  method of UIViewController if you   want  You might do so to initiate a segue from a source that was added   programmatically and therefore not available in Interface Builder    You can still programmatically tell the storyboard to present a view controller using a segue using presentModalViewController  or pushViewController animated  calls  but you ll need a storyboard instance   You can call UIStoryboards class method to get a named storyboard with bundle nil for the main bundle   storyboardWithName bundle

User · Answer

Guess this is answered and accepted  but I just would like to add a few more details to it   What I did to solve a problem where I would present a login-view as first screen and then wanted to segue to the application if login were correct  I created the segue from the login-view controller to the root view controller and gave it an identifier like  myidentifier    Then after checking all login code if the login were correct I d call    self performSegueWithIdentifier    myidentifier  sender  self     My biggest misunderstanding were that I tried to put the segue on a button and kind of interrupt the segue once it were found

[ios] Creating a segue programmatically

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