IOS - How to segue programmatically using swift

Question

I m creating an app that uses the Facebook SDK to authenticate users  I m trying to consolidate the facebook logic in a separate class  Here is the code  stripped for simplicity    import Foundation  class FBManager       class func fbSessionStateChane fbSession FBSession   fbSessionState FBSessionState  error NSError                  handling all session states         FBRequestConnection startForMeWithCompletionHandler    conn  FBRequestConnection   result  AnyObject   error  NSError   - gt  Void in              println  Logged in user   n  result                  let storyboard   UIStoryboard name   Main   bundle  NSBundle mainBundle                let loggedInView  UserViewController   storyboard instantiateViewControllerWithIdentifier  loggedInView   as UserViewController              loggedInView result   result                 todo  segue to the next view                        I m using the above class method to check session state changes  and it works fine   Q  Once I have the user s data  how can I segue to the next view from within this custom class   EDIT  just to be clear  I have a segue with identifier on the storyboard  and I m trying to find a way to perform a segue from a class which is not the view controller

User · Answer

Another option is to use modal segue  STEP 1  Go to the storyboard  and give the View Controller a Storyboard ID  You can find where to change the storyboard ID in the Identity Inspector on the right   Lets call the storyboard ID ModalViewController  STEP 2  Open up the  sender  view controller  let s call it ViewController  and add this code to it  public class ViewController     override func viewDidLoad         showModalView          func showModalView         if let mvc   UIStoryboard name   Main   bundle  nil  instantiateViewController withIdentifier   ModalViewController   as  ModalViewController         self present mvc  animated  true  completion  nil                Note that the View Controller we want to open is also called ModalViewController  STEP 3  To close ModalViewController  add this to it  public class ModalViewController       IBAction func closeThisViewController   sender  Any           self presentingViewController  dismiss animated  true  completion  nil

User · Answer

Swift 3 - Also works with SpriteKit  You can use NSNotification    Example   1   Create a segue in the storyboard and name the identifier  segue   2   Create a function in the ViewController you are segueing from   func goToDifferentView          self performSegue withIdentifier   segue   sender  self       3   In the ViewDidLoad   of your ViewController you are segueing from create the observer   NotificationCenter default addObserver self  selector   selector goToDifferentView   name   segue  as NSNotification Name  object  nil    Update - Last time I used this I had to change the  addObserver call to the following code to silence the errors   NotificationCenter default addObserver self  selector   selector goToDifferentView   name  NSNotification Name rawValue   segue    object  nil    4   In the ViewController or Scene you are segueing to  add the Post Method wherever you want the segue to be triggered   NotificationCenter default post name   segue  as NSNotification Name  object  nil    Update - Last time I used this I had to change the  post call to the following code to silence the errors   NotificationCenter default post NSNotification name  NSNotification Name rawValue   segue    object  nil  as Notification

User · Answer

This worked for me    First of all give the view controller in your storyboard a Storyboard ID inside the identity inspector  Then use the following example code  ensuring the class  storyboard name and story board ID match those that you are using    let viewController  UIViewController   UIStoryboard      name   Main   bundle  nil   instantiateViewControllerWithIdentifier  ViewController   as UIViewController     instantiatViewControllerWithIdentifier   returns AnyObject     this must be downcast to utilize it  self presentViewController viewController  animated  false  completion  nil    For more details see http   sketchytech blogspot com 2012 11 instantiate-view-controller-using html best wishes

User · Answer

You can use NSNotification  Add a post method in your custom class   NSNotificationCenter defaultCenter   postNotificationName  NotificationIdentifier   object  nil    Add an observer in your ViewController   NSNotificationCenter defaultCenter   addObserver self  selector   methodOFReceivedNotication    name  NotificationIdentifier   object  nil    Add function in you ViewController   func methodOFReceivedNotication notification  NSNotification       self performSegueWithIdentifier  yourIdentifierInStoryboard   sender  self

User · Answer

You can do this thing using performSegueWithIdentifier function     Syntax    func performSegueWithIdentifier identifier  String  sender  AnyObject     Example     performSegueWithIdentifier  homeScreenVC   sender  nil

User · Answer

If your segue exists in the storyboard with a segue identifier between your two views  you can just call it programmatically using  self performSegueWithIdentifier  yourIdentifierInStoryboard   sender  self    If you are in Navigation controller  let viewController   YourViewController nibName   YourViewController   bundle  nil          self navigationController  pushViewController viewController  animated  true    I will recommend you for second approach using navigation controller

User · Answer

You can use segue like this   self performSegueWithIdentifier  push   sender  self  override func prepareForSegue segue  UIStoryboardSegue   sender  AnyObject         if segue identifier     push

User · Answer

This worked for me     Button method example   IBAction func LogOutPressed   sender  UIBarButtonItem             do               try Auth auth   signOut               navigationController  popToRootViewController animated  true             catch let signOutError as NSError             print   Error signing out       signOutError

User · Answer

What you want to do is really important for unit testing   Basically you need to create a small local function in the view controller   Name the function anything  just include the performSegueWithIndentifier   func localFunc         println  we asked you to do it       performSegueWithIdentifier  doIt   sender  self      Next change your utility class FBManager to include an initializer that takes an argument of a function and a variable to hold the ViewController s function that performs the segue   public class UtilClass        var yourFunction      - gt          init  someFunction     - gt                self yourFunction   someFunction         println  initialized UtilClass              public convenience init             func dummyLog    - gt                   println  no action passed                     self init dummyLog             public func doThatThing   - gt                  the facebook login function         println  now execute passed function           self yourFunction           println  did that thing              The convenience init allows you to use this in unit testing without executing the segue    Finally  where you have   todo  segue to the next view     put something along the lines of   self yourFunction     In your unit tests  you can simply invoke it as   let f   UtilClass   f doThatThing     where doThatThing is your fbsessionstatechange and UtilClass is FBManager   For your actual code  just pass localFunc  no parenthesis  to the FBManager class

User · Answer

If your segue exists in the storyboard with a segue identifier between your two views  you can just call it programmatically using   performSegue withIdentifier   mySegueID   sender  nil    For older versions   performSegueWithIdentifier  mySegueID   sender  nil    You could also do   presentViewController nextViewController  animated  true  completion  nil    Or if you are in a Navigation controller   self navigationController  pushViewController nextViewController  animated  true

[ios] IOS - How to segue programmatically using swift

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