Questions tagged [dispatch-queue]
231 questions
1
vote
1 answer
DispatchQueue Barrier Not Working As Expected
I have this code in playground
import PlaygroundSupport
import Foundation
PlaygroundPage.current.needsIndefiniteExecution = true
let queue = DispatchQueue(label: "Barrier Test", attributes: .concurrent)
func syncProcess(index: Int) {
…
question
- 11
- 1
1
vote
1 answer
How to load image from Firebase into users avatar
I have a problem with loading images from firebase. I have two functions. One of them collect info about user, second one load users avatar image. Unfortunately images load after function creates new user. I know it will be problem with asynchronous…
Jan Duda
- 39
- 5
1
vote
1 answer
sync a group of async functions
I have some functions to async to each other so, they starts same time but they also sync to others, I built that structure but it looks so dirty, I wanted to ask maybe there is another way to do this.
func doCalc() {
let x = 100
let y =…
OguzYuksel
- 88
- 6
1
vote
1 answer
DispatchQueue doesn't behave like serial queue
By using following code, I am expecting that every time the func is caled, minimum time between executions will be 3-4 seconds.
But: when I call the writeData() 4 times in row, I see that async block executed without waiting for previous call…
Vitaliy A
- 3,651
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1
vote
0 answers
Swift UI Queues and DispatchQueue.main.async
I'm currently building a game in Swift that overlays a 'd-pad' and various other items such as a score label and start label on the game itself.
Those items are set up in an SCNView, while the game itself, consisting of a ship and tunnel, is built…
LittleRocketMan
- 33
- 4
1
vote
1 answer
Decoding a Dictionary Inside a Dictionary - JSON/Swift
I have a JSON file that is structured like this:
"forecast": [
{
"altimeter": "",
"clouds": [
{
"repr": "OVC025",
"type": "OVC",
"altitude": 25,
"modifier": null,
"direction":…
Grayson Bertaina
- 171
- 9
1
vote
1 answer
Closure argument passed as @noescape to Objective-C has escaped
I'm trying to use a resource wrapper for a thread safe access. In my implementation, awaitedValue field performs a synchronous read of resource through a serial queue. For some reason, whenever I try to read this property, my app crashes with an…
EBDOKUM
- 1,696
- 3
- 15
- 33
1
vote
1 answer
How to publish changes from the background thread Swift UI GET Request
I have set up my app such that I use UserDefaults to store a users login info (isLoggedIn, account settings). If a user is logged in and exits out of the application, and then relaunches the app, I would like them to be returned to the home page…
msoni
- 25
- 1
- 5
1
vote
1 answer
Proper use of DispatchQueue in swift login
Im not using properly DispatchQueue function since I have to click 2-3 times in order to change screen, since the data dont load on time. I tried couple of positions in the code but Im always getting the same result.
What is a proper use?
Here is…
user3054705
- 21
- 6
1
vote
0 answers
How to hide label in viewModel with DispatchQueue
I have an issue, and got stuck. Don't know how to solve this.
There is a camera and some masks. When I open the camera and scroll to choose one of the masks, I want to show explanation how to use the camera with the masks, and these explanations…
Jkrist
- 748
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1
vote
1 answer
stop dispatchquene().async in loop globally using swift
override func viewDidLoad() {
super.viewDidLoad()
worktask = DispatchWorkItem {
for i in 1…4 {
sleep(2)
DispatchQueue.main.async {
…
hadoxi
- 25
- 4
1
vote
2 answers
Beginner question on DispatchQueue.main.async
In MainViewController, in viewDidLoad() I'm calling a function which in turn tests if Auth.auth().currentUser == nil; If the condition is met then the statement to execute presents another view controller.
In the if statement, why does the…
codeExperiment
- 15
- 3
1
vote
0 answers
how to handle URLSession.shared.dataTask properly
Hi developers im having some issue or misplaced tasks
so i had to develop a framework with some functions
this is my main FUNCTION where the issue began
func saveDataDevice(idPos: String, macAddress: String) {
// this first function…
ZeroCooL
- 79
- 5
1
vote
0 answers
How to make a serial queue of tasks running in main thread with asynchronous callbacks?
In this case I have to consider the asynchronous callback as part of the task. I want only one task running at the same time.
Here is boilerplate:
func queueATask() {
DispatchQueue.main.async {
doSomeHeavyWorkPartA()
…
Li Fumin
- 1,383
- 2
- 15
- 31
1
vote
1 answer
How to pass a block of type dispatch_block_t to a method
In the below code, I am trying to pass a block of type dispatch_block_t to dispatch_async as shown below.
I have tried the following:
dispatch_async(defaultPriority, block1(2, 3000));
dispatch_async(defaultPriority, (^block1)(2,…
Amrmsmb
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