I have created this simple example to show the issue. I have 4 buttons for upvoting, favouriting, flagging, and hiding. User can tap any button whenever they like and as many times as they want. However, the network request which…
So I have a paginated API that I have to call every time a user enters a screen. The below code works fine but has one issue if say API calls are in progress and the user backs down and…
Desired Outcome Initialize MyClass with fixedValues as the dictionaryRepresentation argument. Set fixed values before executing the init line Problem fixedValues isn't being set before the self.init(... line is ran. Attempted Solutions Returns instead of completions (posted state) Completions, DispatchGroups, Notify…
I am trying to execute a series of tasks with a delay. To experiment that, I created a simple app with two labels and a button to perform hit test. Upon hitting the "Hit me" button, yellow label must update…
I am facing an issue in using semaphores on iOS. I am implementing a feature to execute a series of async methods sequentially, one after another in order. let semaphore = DispatchSemaphore(value: 1) semaphore.wait() performFirstTask { semaphore.signal } semaphore.wait() performSecondTask…
why lable's text can't change, but can debug str? i know queue.sync is excute in main thread，when i sleep in main thread。 class ViewController: UIViewController { let queue = DispatchQueue(label: "queue", qos: .userInteractive) let sem = DispatchSemaphore(value: 0) @IBOutlet var…
I was asked to implement a thread safe dictionary in swift, I used the common approach: class MutableDictionary { var dictionary: [String : Any] = [:] var queue = DispatchQueue(label: "queue", attributes: .concurrent) func object(for key: String) -> Any? {…
To simplify my problem: I have a huge calculation function with 3 inputs and 2 outputs. My input variables are @Published SwiftUI variables inside a SwiftUI ObservableObject. The UI does modify these input variables quite often, if the user takes…
I have 3 functions like this: func getMyFirstItem(complete: @escaping (Int) -> Void) { DispatchQueue.main.async { complete(10) } } func getMySecondtItem(complete: @escaping (Int) -> Void) { DispatchQueue.global(qos:.background).async { complete(10) } } func getMyThirdItem(complete: @escaping (Int) -> Void) { DispatchQueue.main.async { complete(10)…
I have the code below that I use using a "DispatchGroup": // class variables let myUploadGroup = DispatchGroup() var concatenatedUploadGroupMessage:String = "" // inside a method I have the code below for resFoto in resFotosResenhaEscolhidas { myUploadGroup.enter() jsonRequestUploadImagem = ResFotosModel.createJsonFotoResenha(resFoto,…