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I've had an issue in my project where I trigger a task from a SwiftUI View with the modifier .task. From there it calls and async function into an actor that has a TaskGroup that makes concurrent network calls that has a type of Void.self. I've noticed that sometimes the TaskGroup is either never called and will no longer be called.
I'm wondering if perhaps a TaskGroup inside of an Actor that has a parent Task created outside the Actor is a problem? But it does seem to work if I change the Actor to a Class. Could someone help explain to me why this is?
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I have to enter first name ,last name , and mobile number which will be added using a button and then show it in the table view . and when the data is stored in table view the textfield should be blank for next entry.
*note - textfield and tableview are in same view controller
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when I upgrade xcode13 and distribution some base components with xcframework, I got some issue below:
property 'bounds' isolated to global actor 'MainActor' can not be referenced from this synchronous context
17:49:37
17:49:37 @_Concurrency.MainActor(unsafe) public func setPlaceholder(text: Swift.String, Width: CoreGraphics.CGFloat = UIScreen.main.bounds.size.witdth)
when general swiftinterface file with Xcode13, will auto add @_Concurrency for some UI-related function. but UIKit property UIScreen.main.bounds.size.witdth is not mask as _Concurrency.
I try to add @objcMembers to swift Class, the problem is missed.
I think It's an Xcode13 issue~~~
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I tried to build your sample app Coffee Tracker WatchKit App under Xcode 13 and it failed with the message "Cannot find type '<#Value: BinaryFloatingPoint#>' in scope" on line 12 of CoffeeData. I was building the Starting Point, and the updated without modification, same result.
Hello developers,
I already see parallel code using constant number of parallel like this from official site.
async let firstPhoto = downloadPhoto(named: photoNames[0])
async let secondPhoto = downloadPhoto(named: photoNames[1])
async let thirdPhoto = downloadPhoto(named: photoNames[2])
let photos = await [firstPhoto, secondPhoto, thirdPhoto]
show(photos)
But I want to use this to variable size of works.
for photoName in photoNames {
async let ... = downloadPhoto(named: photoName)
}
let photos = await ...
show(photos)
Does swift 5.5 support this case???
By any chance, do I use TaskGroup?
I use TaskGroup already, but I want to know that swift supports it.
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I have a page view controller. it has at most 30 pages.
each page contains a collection view. in collection view, i have to show information which contains images and text from server. and it will have at most 500 contents.
Please note that, my pageViewController is in tabBarController.
So, When i tap on one of my tabs, the pageViewController will be shown.
The issue is, During first initialization of my pageViewController it's very very slow. take almost 3~4 seconds depends on how many pages and contents are in pageViewController.
My query is , how to overcome this issue?
as a side note, i am downloading from server through async operation.
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dyld: Symbol not found: ___chkstk_darwin
Referenced from: //app.app/Frameworks/libswift_Concurrency.dylib (which was built for iOS 13.0)
Expected in: /usr/lib/libSystem.B.dylib
in //Frameworks/libswift_Concurrency.dylib
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I’m currently migrating my app to use the concurrency model in Swift. I want to serialize Tasks to make sure they are executed one after the other (no paralellism). In my use case, I want to listen to notifications posted by the NotificationCenter and execute a Task every time a new notification is posted. But I want to make sure no previous task is running. It's the equivalent of using an OperationQueue with maxConcurrentOperationCount = 1.
For example, I’m using CloudKit with Core Data in my app and I use persistent history tracking to determine what changes have occurred in the store. In this Synchronizing a Local Store to the Cloud Sample Code, Apple uses an operation queue for handling history processing tasks (in CoreDataStack). This OperationQueue has a maximum number of operations set to 1.
private lazy var historyQueue: OperationQueue = {
let queue = OperationQueue()
queue.maxConcurrentOperationCount = 1
return queue
}()
When a Core Data notification is received, a new task is added to this serial operation queue. So if many notifications are received, they will all be performed one after the other one in a serial way.
@objc
func storeRemoteChange(_ notification: Notification) {
// Process persistent history to merge changes from other coordinators.
historyQueue.addOperation {
self.processPersistentHistory()
}
}
In this Loading and Displaying a Large Data Feed Sample Code, Apple uses Tasks to handle history changes (in QuakesProvider).
// Observe Core Data remote change notifications on the queue where the changes were made.
notificationToken = NotificationCenter.default.addObserver(forName: .NSPersistentStoreRemoteChange, object: nil, queue: nil) { note in
Task {
await self.fetchPersistentHistory()
}
}
I feel something is wrong in the second project as Tasks could happen in any order, and not necessarily in a serial order (contrary to the first project where the OperationQueue as a maxConcurrentOperationCount = 1).
Should we use an actor somewhere to make sure the methods are serially called?
I thought about an implementation like this but I’m not yet really comfortable with that:
actor PersistenceStoreListener {
let historyTokenManager: PersistenceHistoryTokenManager = .init()
private let persistentContainer: NSPersistentContainer
init(persistentContainer: NSPersistentContainer) {
self.persistentContainer = persistentContainer
}
func processRemoteStoreChange() async {
print("\(#function) called on \(Date.now.formatted(date: .abbreviated, time: .standard)).")
}
}
where the processRemoteStoreChange method would be called by when a new notification is received (AsyncSequence):
notificationListenerTask = Task {
let notifications = NotificationCenter.default.notifications(named: .NSPersistentStoreRemoteChange, object: container.persistentStoreCoordinator)
for await _ in notifications {
print("notificationListenerTask called on \(Date.now.formatted(date: .abbreviated, time: .standard)).")
await self.storeListener?.processRemoteStoreChange()
}
}
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Hi,
For my app, I tried to configure the Firebase Crashlytics. For configuring I’m not using the pod file. Installed Firebase Without Using CocoaPods. For that I followed the following link:
https://mokacoding.com/blog/setting-up-firebase-without-cocoapods/
Then I added GoogleService-Info.plist to the project from the Firebase account.
After that, I changed the DEBUG_INFORMATION_FORMAT from DWARF to dwarf-with-dsym in Build options. Then I added the Run script in the Build phase.
Added the following script:
"${PROJECT_DIR}/ProjectName/GoogleService-Info.plist" -p ios "${DWARF_DSYM_FOLDER_PATH}/${DWARF_DSYM_FILE_NAME}"
For install build only selected
Based on the dependency analysis is selected
Then in input files, I added the following:
${DWARF_DSYM_FOLDER_PATH}/${DWARF_DSYM_FILE_NAME}/Contents/Resources/DWARF/${TARGET_NAME}
$(SRCROOT)/$(BUILT_PRODUCTS_DIR)/$(INFOPLIST_PATH)
Changed the Scheme from debug to release.
I could not able to get the crash from crashlytics console. Is any issue is with the run scrips?
I appreciate your help in advance.
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have two quote dictionaries I'm trying to append after an in-app purchase. I have tried several different methods to append the dictionaries together but I'm still getting an error "No exact matches in call to instance method 'append'"
I have established variables for each array to then append the array within the struct.
Any thoughts? Is there a better method I should use to add the quotes from the array called QuoteDetails2 to the initial array QuoteDetails?
Here is the code I'm trying to correct:
var topQuotes = [QuoteDetails]()
var additionalQuotes = [QuoteDetails2]()
public struct QuoteProvider {
static func all() -> [QuoteDetails] {
return
[
QuoteDetails(
id: “1”,
texts: “High school is fun”,
authors: “SM”
),
QuoteDetails(
id: “2”,
texts: “Middle School is fun”,
authors: "A. Philip Randolph"
),
QuoteDetails(
id: “3”,
texts: “The playground is fun”,
authors: "Booker T. Washington"
),
QuoteDetails(
id: “4”,
texts: "Hold on to your dreams of a better life and stay committed to striving to realize it.",
authors: “KJ”
)
]
}
static func all2() -> [QuoteDetails2] {
return [
QuoteDetails2(
id: "1",
texts: "The cat ran fast”,
authors: " ME”
),
QuoteDetails2(
id: "2",
texts: “The dog ran fast.”,
authors: " ME”
),
QuoteDetails2(
id: "3",
texts: "End life problems”,
authors: “ME”
)
]
}
func showPremiumQuotes() {
if UserDefaults.standard.bool(forKey: "premiumQuotes") == true {
topQuotes.append(contentsOf: additionalQuotes)
}
}
/// - Returns: A random item.
static func random() -> QuoteDetails {
let allQuotes = QuoteProvider.all()
let randomIndex = Int.random(in: 0..<allQuotes.count)
return allQuotes[randomIndex]
}
}
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Why content view is having gap with scroll view on right side despite its trailing constraint set to 0 and scroll view constraints also (0,0,0,0) ?
