Passing array through segue in swift

Question

I\'ve been struggling for a few days now with passing an array from my SecondViewController to my FirstViewController using Swift.

From my rese

Answer 1

You can use protocol to pass data between view controllers

protocol YourFirstViewControllerDelegate: class {
    func onButtonClicked(yourString: [String])
}

For passing data from first view controller to second in your Main view Controller when you want to show your first view controller:

1. you should set main view controller to your view controller delegate, yourFirstViewController.setDlegate(self)

2. In FirstViewController you should raise an event to main with onButtonClicked([String])

3. In onButtonClicked([String]) you can call secondViewController and pass your array with onSecondViewController([String])

   class MainViewController: UIViewController,YourFirstViewControllerDelegate{
   var yourString = [String]()
   weak var vcFirst: FirstViewController?
   weak var vcSecond: SecondViewController?
   func onFirstViewController(){
   
       if (self.vcFirst == nil){
           self.vcFirst = self.storyboard?.instantiateViewController(withIdentifier: "FirstViewController") as? FirstViewController
           self.vcFirst!.view.translatesAutoresizingMaskIntoConstraints = false
           self.vcFirst?.setDelegate(youeFirstViewControllerDelegate: self)
       }
       self.setActiveController(viewController: self.vcFirst)
   
   }
   
   func onSecondViewController(yourString:[String]){
       if (self.Second == nil){
           self.Second = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as? SecondViewController
           self.vcSecond!.view.translatesAutoresizingMaskIntoConstraints = false
   self.vcSecond.setArray(yourArray: self.yourArray)
       }
       self.setActiveController(viewController: self.vcSecond)
   
   }
   
   ....// your view controller method
   
   func onButtonClicked(yourString: [String]){
   self.yourString = yourString
   onSecondViewController(yourString:self.yourString)
   }
   

In your First view controller

class FirstViewController: UIViewController{
    weak var yourFirstViewControllerDelegate: YourFirstViewControllerDelegate?
    var yourString = ["test1","test2"]
//  all your overide method should be here
    func setDelegate(yourFirstViewControllerDelegate:  YourFirstViewControllerDelegate){ 
    self.yourFirstViewControllerDelegate = yourFirstViewControllerDelegate
  }

func onButtonClicked(){
     self.yourFirstViewControllerDelegate.onButtonClicked(self.yourString)
    }

In your second view controller

class SecondViewController: UIViewController{
var yourString = [String]
//  all your overide method should be here and you can use your [String]
 func setArray(yourString:[String]){
 self.yourString = yourString
 }
}

I have not Mac OS to check my code now please just read this code not copy, I'll edit this code tomorrow