I've removed the comment.

The following works. import UIKit import Combine class ViewController: UIViewController { // MARK: - Variables private var cancellableSet: Set<AnyCancellable> = [] override func viewDidLoad() { super.viewDidLoad() let _ = Future<[DataModel], Error> { [weak self] promise in guard let strongSelf = self else { return } let url = URL(string: "https://api.github.com/repos/ReactiveX/RxSwift/events")! URLSession.shared.dataTaskPublisher(for: url) .timeout(2.0, scheduler: DispatchQueue.global(qos: .background)) .retry(3) .map { $0.data } .decode(type: [DataModel].self, decoder: JSONDecoder()) .sink(receiveCompletion: { (completion) in print("I'm done: \(completion)") }, receiveValue: { dataModels in for model in dataModels { print("\(model.id) \(model.type)") } promise(.success(dataModels)) }) .store(in: &strongSelf.cancellableSet) } } } I wonder why it doesn't work if I use ViewModel?

override func viewDidLoad() { super.viewDidLoad() let text = "1:47PM" if let regularFont = UIFont(name: "Helvetica", size: 20.0), let subscriptFont = UIFont(name: "TamilSangamMN", size: 12.0) { let attString:NSMutableAttributedString = NSMutableAttributedString(string: text, attributes: [.font: regularFont]) attString.setAttributes([.font: subscriptFont, .baselineOffset: 6], range: NSRange(location: text.count - 2, length: 2)) label.attributedText = attString } }

You should start by reading the Swift Programming Language.

Call them up?

Don't you have something else to have fun?

Are you having fun?

I guess it goes like the following. Publishers.CombineLatest4($variable0, $variable1, $variable2, $variable3) .combineLatest($variable4) .combineLatest($variable5) .sink { completion in } receiveValue: { response0, response1 in let variable = response0.0 let variable4 = response0.1 let variable5 = response1 let v0 = variable.0 let v1 = variable.1 let v2 = variable.2 let v3 = variable.3 }.store(in: &cancellables) It's kind of odd.

I thought let publishers = Publishers.CombineLatest4($variable0, $variable1, $variable2, $variable3) .combineLatest($variable4) .combineLatest($variable5) could work. But it doesn't.

Actually, no...

Maybe, subscribing to an array of them?

It depends on the purpose of your app. After a trial period, if the app has no features to use, then it will be rejected for sure.

To my knowledge, Apple Pay is not a payment processing service system. It's a mediator or a digital wallet that stores privacy data and allows the user to make a payment through a third-party processing system. So the answer to your question is no, I suppose.

Go to Apple Developer and click on Membership after signing in.

Okay... The solution to my question is use of the Future guy. class APIClient: NSObject { var cancellables = [AnyCancellable]() @Published var models = [MyModel]() func fetchData(urlStr: String) -> Future<[MyModel], Error> { return Future<[MyModel], Error> { [weak self] promise in guard let url = URL(string: urlStr) else { return promise(.failure("Failure" as! Error)) } guard let strongSelf = self else { return } URLSession.shared.dataTaskPublisher(for: url) .map { $0.data } .decode(type: [MyModel].self, decoder: JSONDecoder()) .replaceError(with: []) .sink { completion in if case .failure(let error) = completion { promise(.failure(error)) } } receiveValue: { promise(.success($0)) } .store(in: &strongSelf.cancellables) } } } class ViewModel: NSObject { @IBOutlet var apiClient: APIClient! var cancellables = Set<AnyCancellable>() @Published var dataModels = [MyModel]() func getGitData() -> Future<[MyModel], Error> { let urlStr = "https://api.github.com/repos/ReactiveX/RxSwift/events" return Future<[MyModel], Error> { [weak self] promise in guard let strongSelf = self else { return } strongSelf.apiClient.fetchData(urlStr: urlStr) .sink { completion in if case .failure(let error) = completion { promise(.failure(error)) } } receiveValue: { promise(.success($0)) print("view model: \($0.count)") } .store(in: &strongSelf.cancellables) } } }