How would I access a published variable from another class?-CodePudding

So I am currently working on my app and have come across a problem where I have to access a published variable in another observable class.

Here is some code on what I am trying to do

class PeriodViewModel: ObservableObject {
    @Published var value = 1
}



class DataViewModel: ObservableObject {
    @ObservedObject var periodViewModel = PeriodViewModel()

    periodViewModel.value = 1
}

How would I be able to access the updated variable from periodViewModel in dataViewModel? Thanks.

CodePudding user response：

[Note]: Ignore all the variables I am just showing the the flow of using different mangers.

Here is an example of function that I am using for my FirebaseDatabaseManage. You can see a clouser is passing into the function parameter. When your firebase insert function response after async you need to call your clouser which I named as completion.

class FirebaseDatabaseManager {
    
    
    public func insertRecipe(with recipe: RecipeModel, completion: @escaping (Bool, String) -> Void) {
        
        SwiftSpinner.show("Loading...")
        let userID = UserDefaultManager.shared.userId
        
        database.child(FireBaseTable.recipes.rawValue).child(userID).childByAutoId().setValue(recipe.convertToDictionary!, withCompletionBlock: { error, ref in
            
            SwiftSpinner.hide()
            
            guard error == nil else {
                completion(false, "failed to write to database")
                return
            }
            
            completion(true, ref.key ?? "no key found")
            
        })
    }
}

Now look at my ViewModel class in which I am calling my FirebaseManager method. On calling of completion I am updating my @Publisher Which you can use to update your UI.

class RecipeViewModel: ObservableObject {

  @Publisher var id = 0
    
    func createRecipe() {
        
        FirebaseDatabaseManager.shared.insertRecipe(with: self.recipeModel) { status, id in
            
            self.id = id
        }
    }
}

Hope this help your in understand your concepts.