How to pass prepareForSegue an object

Question

I have many annotations in a mapview  with rightCalloutAccessory buttons   The button will perform a segue from this mapview to a tableview   I want to pass the tableview a different object  that holds data  depending on which callout button was clicked   For example   totally made up    annotation1  Austin  -  pass data obj 1  relevant to Austin  annotation2  Dallas  -  pass data obj 2  relevant to Dallas  annotation3  Houston  -  pass data obj 3 and so on     you get the idea    I am able to detect which callout button was clicked   I m using prepareForSegue  to pass the data obj to the destination ViewController   Since I cannot make this call take an extra argument for the data obj I require  what are some elegant ways to achieve the same effect  dynamic data obj    Any tip would be appreciated

User · Accepted Answer

Simply grab a reference to the target view controller in prepareForSegue: method and pass any objects you need to there. Here's an example...

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"YOUR_SEGUE_NAME_HERE"])
    {
        // Get reference to the destination view controller
        YourViewController *vc = [segue destinationViewController];

        // Pass any objects to the view controller here, like...
        [vc setMyObjectHere:object];
    }
}

REVISION: You can also use performSegueWithIdentifier:sender: method to activate the transition to a new view based on a selection or button press.

For instance, consider I had two view controllers. The first contains three buttons and the second needs to know which of those buttons has been pressed before the transition. You could wire the buttons up to an IBAction in your code which uses performSegueWithIdentifier: method, like this...

// When any of my buttons are pressed, push the next view
- (IBAction)buttonPressed:(id)sender
{
    [self performSegueWithIdentifier:@"MySegue" sender:sender];
}

// This will get called too before the view appears
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"MySegue"]) {

        // Get destination view
        SecondView *vc = [segue destinationViewController];

        // Get button tag number (or do whatever you need to do here, based on your object
        NSInteger tagIndex = [(UIButton *)sender tag];

        // Pass the information to your destination view
        [vc setSelectedButton:tagIndex];
    }
}

EDIT: The demo application I originally attached is now six years old, so I've removed it to avoid any confusion.

User · Answer

I used this solution so that I could keep the invocation of the segue and the data communication within the same function   private var segueCompletion     UIStoryboardSegue  Any   - gt  Void    func performSegue withIdentifier identifier  String  sender  Any   completion   escaping  UIStoryboardSegue  Any   - gt  Void        self segueCompletion   completion      self performSegue withIdentifier  identifier  sender  sender       self segueCompletion   nil    override func prepare for segue  UIStoryboardSegue  sender  Any         self segueCompletion  segue  sender      A use case would be something like   func showData id   Int       someService loadSomeData id  id            data in         self performSegue withIdentifier   showData   sender  self                storyboard  sender in             let dataView   storyboard destination as  DataView             dataView data   data                     This seems to work for me  however  I m not 100  sure that the perform and prepare functions are always executed on the same thread

User · Answer

In Swift 4 2 I would do something like that    override func prepare for segue  UIStoryboardSegue  sender  Any         if let yourVC   segue destination as  YourViewController           yourVC yourData   self someData

User · Answer

Sometimes it is helpful to avoid creating a compile-time dependency between two view controllers  Here s how you can do it without caring about the type of the destination view controller   -  void prepareForSegue  UIStoryboardSegue   segue sender  id sender       if   segue destinationViewController respondsToSelector  selector setMyData                segue destinationViewController performSelector  selector setMyData                                                  withObject myData              So as long as your destination view controller declares a public property  e g     property  nonatomic  strong  MyData  myData    you can set this property in the previous view controller as I described above

User · Answer

For Swift use this   override func prepareForSegue segue  UIStoryboardSegue  sender  AnyObject         var segueID   segue identifier      if segueID      yourSegueName             var yourVC YourViewController   segue destinationViewController as YourViewController          yourVC objectOnYourVC   setObjectValueHere

User · Answer

I have a sender class  like this   class MyEntry    interface MySenderEntry   NSObject  property  strong  nonatomic  MyEntry  entry   end   implementation MySenderEntry  end   I use this sender class for passing objects to prepareForSeque sender   - void didSelectItemAtIndexPath  NSIndexPath  indexPath       MySenderEntry  sender    MySenderEntry new       sender entry     entries objectAtIndex indexPath row        self performSegueWithIdentifier SEGUE IDENTIFIER SHOW ENTRY sender sender      - void prepareForSegue  UIStoryboardSegue  segue sender  id sender       if    segue identifier  isEqualToString SEGUE IDENTIFIER SHOW ENTRY             NSAssert  sender isKindOfClass  MySenderEntry class      MySenderEntry            MySenderEntry  senderEntry    MySenderEntry  sender          MyEntry  entry   senderEntry entry          NSParameterAssert entry             segue destinationViewController  delegate   self           segue destinationViewController  entry   entry          return             if    segue identifier  isEqualToString SEGUE IDENTIFIER HISTORY                            return             if    segue identifier  isEqualToString SEGUE IDENTIFIER FAVORITE                            return

User · Answer

I came across this question when I was trying to learn how to pass data from one View Controller to another  I need something visual to help me learn though  so this answer is a supplement to the others already here  It is a little more general than the original question but it can be adapted to work   This basic example works like this     The idea is to pass a string from the text field in the First View Controller to the label in the Second View Controller   First View Controller  import UIKit  class FirstViewController  UIViewController         IBOutlet weak var textField  UITextField          This function is called before the segue     override func prepareForSegue segue  UIStoryboardSegue  sender  AnyObject                 get a reference to the second view controller         let secondViewController   segue destinationViewController as  SecondViewController             set a variable in the second view controller with the String to pass         secondViewController receivedString   textField text             Second View Controller  import UIKit  class SecondViewController  UIViewController         IBOutlet weak var label  UILabel          This variable will hold the data being passed from the First View Controller     var receivedString           override func viewDidLoad             super viewDidLoad               Used the text from the First View Controller to set the label         label text   receivedString            Remember to   Make the segue by control clicking on the button and draging it over to the Second View Controller  Hook up the outlets for the UITextField and the UILabel  Set the first and second View Controllers to the appropriate Swift files in IB    Source  How to send data through segue  swift   YouTube tutorial   See also  View Controllers  Passing data forward and passing data back  fuller answer

User · Answer

I ve implemented a library with a category on UIViewController that simplifies this operation  Basically  you set the parameters you want to pass over in a NSDictionary associated to the UI item that is performing the segue  It works with manual segues too   For example  you can do   self performSegueWithIdentifier   yourIdentifier  parameters     customParam1  customValue1    customValue2  customValue2      for a manual segue or create a button with a segue and use   button setSegueParameters     customParam1  customValue1    customValue2  customValue2      If destination view controller is not key-value coding compliant for a key  nothing happens  It works with key-values too  useful for unwind segues   Check it out here https   github com stefanomondino SMQuickSegue

User · Answer

My solution is similar        In destination class   var AddressString String   String       In segue  override func prepareForSegue segue  UIStoryboardSegue  sender  AnyObject        if  segue identifier     seguetobiddetailpagefromleadbidder                 let secondViewController   segue destinationViewController as  BidDetailPage         secondViewController AddressString   pr address as String

User · Answer

Just use this function    override func prepare for segue  UIStoryboardSegue  sender  Any         let index   CategorytableView indexPathForSelectedRow     let indexNumber   index  row     let VC   segue destination as  DestinationViewController    VC value   self data

[ios] How to pass prepareForSegue: an object

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