How to pass data from one UIViewController to another?

Question

I have UITabViewController and two UIViewControllers. I use storyboards and segues. In the first VC. I get data from Firebase and save it. Then I need to pass this data to another vc in order to change the text of UILabel in the second vc. Thank you

func fetchCeloriesData() {
        refWorkout = workout!.title
         Database.database().reference().child("programs").child(refWorkout).child("calories").observeSingleEvent(of: .value) { (snapshot) in
            let caloriesData = snapshot.value as! String
            print(caloriesData)
            
           
           // self.dietVC.BurnedLabel.text? = caloriesData
             
         }
     }

I'm not sure it's the best way, but for simple data like Int/String I use Userdefaults, while for objects I call in the VC where I want the data to be passed something like: VC1().dataINeedToPass and I assign it to a new variable — Federica Benacquista, Dec 16 '20 at 09:14
If I don't misunderstand, this might be what you want -> [How to pass data to UITabBarController](https://stackoverflow.com/a/44180862/11593936) — Alice S., Dec 16 '20 at 09:44

score 0 · Answer 1 · answered Dec 16 '20 at 12:01

If you are using storyboards and segues, you can simply use

func prepare(for segue: UIStoryboardSegue, 
  sender: Any?)

you can identify segue there from storyboard and sender will be self. and then

func performSegue(withIdentifier identifier: String, 
       sender: Any?)

Here you have to take identifier from storyboard which will be string. and on the event of moving to second ViewController call this perfromSegue function.

How to pass data from one UIViewController to another?

1 Answers1