I'm running a simulation (SwiftUI app), which has 100 steps. I need each step to be executed in order. A first try was to dispatch with delay to schedule each second: for step in 0..<100 { DispatchQueue.main.asyncAfter(deadline: .now() + Double(step) * 1.0) { // simulation code } } Very poor results as 100 running threads are too much load for the system. So I split in 2 stages: for bigStep in 0..<10 { DispatchQueue.main.asyncAfter(deadline: .now() + Double(bigStep) * 10.0 ) { for step in 0..<10 { DispatchQueue.main.asyncAfter(deadline: .now() + Double(step) * 1.0) { // simulation code } } } } It works much better, as now there are a max of 20 threads active (in fact I create more levels to limit to a max of 8 concurrent threads). It addition, it allows to interrupt the simulation before end. My questions: is it the appropriate pattern ? Would a timer be better ? Other options ?

I notice that several (most) tags are not accessible now (Nov 2, 19:30 GMT). For instance https://developer.apple.com/forums/tags/ios https://developer.apple.com/forums/tags/uikit https://developer.apple.com/forums/tags/macos https://developer.apple.com/forums/tags/appkit https://developer.apple.com/forums/tags/xcode https://developer.apple.com/forums/tags/interface-builder all with the same error: The page you’re looking for can’t be found But others are: https://developer.apple.com/forums/ https://developer.apple.com/forums/tags/swift Is it only me ?

Capability to read and write ofd HFS disks on Mac has been removed since a long time. Capability to simply read was also removed since Catalina I think. That is surprising and sometimes frustrating. I still use a 90's MacBook for a few tasks and need from time to time to transfer files to newer Mac or read some old files stored on 3.5" disks. Solution I use is to read the disk on an old Mac with MacOS 10.6 (I'm lucky enough to have kept one) and transfer to USB stick or airdrop… As there is no USB port on the Macbook of course (and I have no more a working 56k modem to transfer by mail), only option if not 3,5" disk is using PCMCIA port on the MacBook for writing to an SD Card to be read in Mac Sonoma. But reading directly 3.5" disk would be great. Hence my questions for the forum: how hard would it be to write such a driver for READING only HFS on Mac Sonoma? There are some software like FuseHFS. Did anyone experience it ? Did anyone have a look at the source code (said to be open source). does anyone know why Apple removed such capability (I thought it was a tiny piece of code compared to the GB of present MacOS)? Thanks for any insights on the matter.

Not a question, but a surprise. Did I miss something, but apparently there has been no new beta release (16.3) since Release of 16.2 on Dec 11. 2 months without betas is really unusual (in fact, it never happened and usually, next beta n+1 is even released before the final release of version n). So does that mean 16.3 will be a major update ? Wait and see.

Even though I have selected all the notification options in my profile, I do not receive any mail (since about a week), at least when an answer is marked as correct. I did check they are not in spam. What do I miss ?

Since a few hours, Sat 1/29/2022, several pages of the forum do not open, such as: https://developer.apple.com/forums/ https://developer.apple.com/forums/tags/ios all showing the same messages: Other tags open without problem. And those open with a payload: https://developer.apple.com/forums/?page=1&sortBy=lastUpdated https://developer.apple.com/forums/search/?q=column&page=1&sortBy=lastUpdated https://developer.apple.com/forums/tags/ios/?page=2 works, but page=1 doesn't Does anyone experience the same errors ? Conf: MacOS 12.2 (21D49) Safari Technology Preview Release 139 (Safari 15.4, WebKit 17613.1.14.41.3) But the pages open correctly on Firefox, Chrome. Does not open either on Safari Version 15.3 (17612.4.9.1.5) So issue is apparently on Safari probably not MacOS 12.2 (21D49) , nor on server side.

I have a tableView inside a UIView in a VC. This VC is in a navigation view. It is a UIViewController, not a UITableViewController. The VC set up is this one: The issue: When I run app, there is a bar (full width, about 25 pixels high) appearing over the tableView at the bottom, hiding partially a cell (we see the (i) button nearly completely hidden). When scrolling tableView, this bar does not move and hides other cell. I looked at the view in debugger (I edited the content of cells): and found that the bar which is hiding comes from navigation controller: So 2 questions: what is this view ? How to avoid it coming over the table view ? I have a solution by replacing upperView by a header in tableView, but I would like to understand what goes on here.

Hi Quinn, if I may add a point 10 to your (very meaningful) list: when pasting images, think of reducing the size (can edit simply the image ref by dividing a dimension by 2) to avoid huge images that clutter the screen. When you get an answer, please indicate if that solved the issue, if not explain what is not working. And don't forget to close the thread by marking the correct answer once you got it.

Since a few hours, forum has an hectic behaviour: most often, returns "We'll be back." page or completely unformatted page or partially formatted even post page is a mess Is it a known problem or only on my side ?

I've noticed there is a new 'Same Here' button showing on any post (except your own posts). I first thought it was a link to a similar question… Specially when the button just says 'Same here' without any badge value. But no, it is just similar to a like… I guess the goal is to avoid and speed up instead of posting a reply or a comment 'Same here'. Unfortunately, it is not possible to undo and no way to know who posted. As your own posts do not show the button, does it mean you cannot know how many share the same issue than the one you posted ? If so, that's bizarre. Hope it will show the counter at least when it is non zero. Let me see how many 'Same here' on this post… .

I see this message for the first time: It is inserted in the OP (https://developer.apple.com/forums/thread/757852) but the link leads to nowhere (just the general page of the forum). In … what ?!? So I wonder what is the meaning of the message, its intent and use ? Or is it just a forum bug ? PS: surprisingly, this post appears in Forums general page (https://developer.apple.com/forums/latest), but not in forums feedback (https://developer.apple.com/forums/tags/forums-feedback) PS2: it appears, but after all the pinned messages which are older. Really confusing… I posted a bug report on this: Jun 23, 2024 at 9:29 PM – FB14024970

Since 2 hours (1:20 GMT July 18), I keep receiving the exact same message from iTunesStore every 5 minutes (30 received so far, with metronome regularity): Your banking information was accepted Thank you for providing the requested details for xxxxxx associated with your banking update in App Store Connect. Any payments may take up to 2 payment cycles to send. If you have any questions, contact us at http://developer.apple.com/contact/. I did not update any information since at least 6 weeks. I contacted support, it seems to be widespread problem. I filed a bug report: Jul 18, 2024 at 5:51 PM – FB14377820

In this UIKit app, I have to display numbers (from 1 to 100), in a label., on several lines, with 8 numbers on each line. Order is computed by the app for a specific purpose. The numbers are separated by space. Label font is Helvetica Neue 15.0. I want to get them aligned vertically. So, I have a padding so that they are all the same length of 4. Problem: the space have smaller width (half in fact) than digits, so alignment is disrupted: Of course, I can use fixed width fonts (like Menlo), but I've not found one that fits (the zero is barred, which is not looking great in the app). I have tried using class func monospacedDigitSystemFont( ofSize fontSize: CGFloat, weight: UIFont.Weight ) -> UIFont and apply to label.text. To no avail as it modifies only digits, not space char. I have found a workaround, padding with 2 spaces instead of one, but is there another solution ? So I am looking for a space character that would have the same width as a digit. There existe thin space (https://en.wikipedia.org/wiki/Whitespace_character) but not larger space. Does it exist ?

I'm struggling to convert Swift 5 to Swift 6. As advised in doc, I first turned strict concurrency ON. I got no error. Then, selected swift6… and problems pop up. I have a UIViewController with IBOutlets: eg a TextField. computed var eg duree func using UNNotification: func userNotificationCenter I get the following error in the declaration line of the func userNotificationCenter: Main actor-isolated instance method 'userNotificationCenter(_:didReceive:withCompletionHandler:)' cannot be used to satisfy nonisolated requirement from protocol 'UNUserNotificationCenterDelegate' So, I declared the func as non isolated. This func calls another func func2, which I had also to declare non isolated. Then I get error on the computed var used in func2 Main actor-isolated property 'duree' can not be referenced from a nonisolated context So I declared duree as nonsilated(unsafe). Now comes the tricky part. The computed var references the IBOutlet dureeField if dureeField.text == "X" leading to the error Main actor-isolated property 'dureeField' can not be referenced from a nonisolated context So I finally declared the class as mainActor and the textField as nonisolated @IBOutlet nonisolated(unsafe) weak var dureeField : UITextField! That silences the error (but declaring unsafe means I get no extra robustness with swift6) just to create a new one when calling dureeField.text: Main actor-isolated property 'text' can not be referenced from a nonisolated context Question: how to address properties inside IBOutlets ? I do not see how to declare them non isolated and having to do it on each property of each IBOutlet would be impracticable. The following did work, but will make code very verbose: if MainActor.assumeIsolated({dureeField.text == "X"}) { So I must be missing something.

After porting code to Swift 6 (Xcode 16.4), I get a consistent crash (on simulator) when using UNUserNotificationServiceConnection It seems (searching on the web) that others have met the same issue. Is it a known Swift6 bug ? Or am I misusing UNUserNotification ? I do not have the crash when compiling on Xcode 26 ß5, which hints at an issue in Xcode 16.4. Crash log: Thread 10 Queue : com.apple.usernotifications.UNUserNotificationServiceConnection.call-out (serial) As far as I can tell, it seems error is when calling nonisolated func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) I had to declare non isolated to solve a compiler error. Main actor-isolated instance method 'userNotificationCenter(_:didReceive:withCompletionHandler:)' cannot be used to satisfy nonisolated requirement from protocol 'UNUserNotificationCenterDelegate' I was advised to: Add 'nonisolated' to 'userNotificationCenter(_:didReceive:withCompletionHandler:)' to make this instance method not isolated to the actor I filed a bug report: Aug 10, 2025 at 2:43 PM – FB19519575