I’m developing a Swift class as a Manager that needs to fetch initial data from an API during initialization. I want to ensure that the class is fully initialized only after the data has been fetched and is available for use. Here’s a simplified version of what I’m trying to achieve:

import Foundation
class DataManager {
static let shared = DataManager()
private let apiService: APIService
private var data: [String] = []

private init(apiService: APIService = APIService()) {
    self.apiService = apiService

    // How can I ensure that the class waits for data fetching to complete before continuing initialization?
    Task {
        do {
            self.data = try await self.fetchInitialData()
            print("Initial data fetched: (self.data)")
        } catch {
            print("Error fetching initial data: (error)")
        }
    }
}

func fetchInitialData() async throws -> [String] {
    // Example of fetching data asynchronously from API
    let fetchedData = try await apiService.fetchData()
    return fetchedData
}

var fetchedData: [String] {
    return data
}

}

The reason I’m trying to do this is so that multiple ViewModels can rely on a single API call to fetch the data. However, I’m encountering a problem where sometimes I get an empty data list because the initialization hasn’t completed fetching the data before the data is accessed.