I suspect this point has been discussed in length, but I would like to find some reference to the design logic behind some Swift key aspect : the assignment operator, by value or reference. We know well how = works, depending it deals with reference or value (knowing the consequence of misuse) and the difference between the 2 : class AClass { var val: Int = 0 } struct AStruct { var val : Int = 0 } let aClass = AClass() let bClass = aClass bClass.val += 10 print("aClass.val", aClass.val, "bClass.val", bClass.val) let aStruct = AStruct() var bStruct = aStruct bStruct.val += 10 print("aStruct.val", aStruct.val, "bStruct.val", bStruct.val) Hence my question. Was it ever considered to have 2 operators, one used to assign reference and the other to assign value? Imagine we have : = operator when dealing with references := operator when dealing with content. Then let bClass = aClass would remain unchanged. But var bStruct = aStruct would not be valid anymore, with a compiler warning to replace by var bStruct := aStruct On the other end, we could now write let bClass := aClass to create a new instance and assign another instance content, equivalent to convenience initialiser class AClass { var val: Int = 0 init(with aVar: AClass) { self.val = aVar.val } init() { } } called as let cClass = AClass(with: aClass) But the 2 operators would have made it clear that when using = we copy the reference. When using := we copy content. I do think there is a strong rationale behind the present design choice (side effects I do not see ?), but I would appreciate to better understand which.

In the new version of download > More, there doesn't seem to be a way to filter search efficiently. I searched for instance for MacOS (to see all releases). I get a very long list (200+) references, with a lot of Xcode, but nothing specific to MacOS. If I search for Xcode 11, I get all Xcode references: I added quotes to try and force an exact search, I just get a Java extension… That was not the case in the previous version of the more page. Or do I miss something ?

I try to rotate a page 180° in a pdf file. I nearly get it, but the page is also mirrored horizontally. Some images to illustrate: Initial page: Result after rotation (see code): it is rotated 180° BUT mirrored horizontally as well: The expected result It is just as if it was rotated 180°, around the x axis of the page. And I would need to rotate 180° around z axis (perpendicular to the page). It is probably the result of writeContext!.scaleBy(x: 1, y: -1) I have tried a lot of changes for transform, translate, scale parameters, including removing calls to some of them, to no avail. @IBAction func createNewPDF(_ sender: UIButton) { var originalPdfDocument: CGPDFDocument! let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask) let documentsDirectory = urls[0] // read some pdf from bundle for test if let path = Bundle.main.path(forResource: "Test", ofType: "pdf"), let pdf = CGPDFDocument(URL(fileURLWithPath: path) as CFURL) { originalPdfDocument = pdf } else { return } // create new pdf let modifiedPdfURL = documentsDirectory.appendingPathComponent("Modified.pdf") guard let page = originalPdfDocument.page(at: 1) else { return } // Starts at page 1 var mediaBox: CGRect = page.getBoxRect(CGPDFBox.mediaBox) // mediabox which will set the height and width of page let writeContext = CGContext(modifiedPdfURL as CFURL, mediaBox: &mediaBox, nil) // get the context var pageRect: CGRect = page.getBoxRect(CGPDFBox.mediaBox) // get the page rect writeContext!.beginPage(mediaBox: &pageRect) let m = page.getDrawingTransform(.mediaBox, rect: mediaBox, rotate: 0, preserveAspectRatio: true) // Because of rotate 0, no effect ; changed rotate to 180, then get an empty page writeContext!.translateBy(x: 0, y: pageRect.size.height) writeContext!.scaleBy(x: 1, y: -1) writeContext!.concatenate(m) writeContext!.clip(to: pageRect) writeContext!.drawPDFPage(page) // draw content in page writeContext!.endPage() // end the current page writeContext!.closePDF() } Note: This is a follow up of a previous thread, https://developer.apple.com/forums/thread/688436

I use UIActivityViewController to airDrop pdfFile (pdfURL) from iPhone to iMac. Works well, file is airDropped. let activityVC = UIActivityViewController(activityItems: [pdfURL], applicationActivities: nil) present(activityVC, animated: true, completion: nil) I want to customise it: limit services to AIrDrop and mail How can I exclude such services as WhatsApp, Notes… ? perform some action once the file has completed airDrop or once cancelled. I tried to implement with completionWithItemsHandler:         activityVC.completionWithItemsHandler = { (activity, success, items, error) in             print("Completed")         } This doesn't work, print is not executed. My ultimate goal is to close the activityVC automatically once action was completed, without need to tap close button. Should I define some content for applicationActivities ?

Here is the set up: I try to set a constraint for the top of tableView relative to safe area. No way by control-drag from tableView to Safe area. But if i create such a constraint for another object (here, like upperView) and then edit the constraint in Inspector, I can replace UpperView by tableView ; and get my constraint set. What am I missing here ?

I use a ViewBuilder to generate the destination used in a NavigationSplitView (to select the detail View). This viewBuilder depends on a parameter (in fact 2, but I try to simplify). ViewBuilder is simple, just calls a View: @ViewBuilder func destination(object: SomeObject, name: String) -> some View { MyView(objToUse: object, nameToUse: name) } But this does not work. When I change the selection in the Master of the splitView, view is not updated (even though I've checked the content is updated. This si so simple that I started using directly MyView(objToUse: object, nameToUse: name) in the detail View. It did not work either. Now, here is the surprise: if I use a switch statement in the ViewBuilder, it works: Let's say we have: struct SomeContent: Hashable, Identifiable, Codable { var id = UUID() var name: String } struct Object : Hashable, Identifiable, Equatable, Codable { var id = UUID() var content: [SomeContent] = [] } So I define a func to get all the names func allNames(of object: SomeObject) -> [String] { var names : [String] = [] for o in object.content { names.append(o.name) } return names } And modify ViewBuilder as follows: it works @ViewBuilder func destination(object: SomeObject, name: String) -> some View { let names : [String] = allNames(of: object) switch name { case names[0]: MyView(objToUse: object, nameToUse: name) case names[1]: MyView(objToUse: object, nameToUse: name) case names[2]: MyView(objToUse: object, nameToUse: name) default: EmptyView() } It also works with nested if else if instead of a switch. What is it I am missing ?

This is a SwiftUI Mac App. There is an observable object with a published array class AllObjects : ObservableObject { @Published var theItems = [Item]() } In the View, observed with: @ObservedObject var allObjects : AllObjects Item class is : class Item: ObservableObject, Identifiable { let id = UUID() var placeNo = 1 // Other properties } When I switch dark / light mode within the app (with a toggle) @Environment(\.colorScheme) var colorScheme the ObservedObject allObjects is modified: array is emptied: allObjects.theItems is now an empty array. What could cause the change to theItems ? I have checked that the only func un which theItems is reset to [] is not called.

I read in Xcode 15.2 release notes that @IBDesignable and @Inspectable are deprecated and will disappear in a future release. After the abandon of WatchKit and its storyboard, replaced by SwiftUI, does it mean storyboards (and consequently UIKit) will progressively disappear, leaving developers alone with SwiftUI to design apps (IMHO, inadequate to design complex UI: for instance, I always struggle to position precisely objects for all devices sizes as we miss constraints manager in SwiftUI) ? For sure, IBDesignable is (was) whimsical, but a very useful tool to design sophisticated UI. Replacing by #Preview does not make it. I also understand that Xcode is a very complex piece of code and that maintaining and evolving some tools (as IBDesignable) requires effort. But isn't it what we expect from Apple ? To provide us with the best tools and keep on the promise of WYSIWYG environments, all along ? Is it only me or do others share this view ?

Is it only me ? I received recently a notification that an answer was "recommended by Apple", with a link to the post. But when going to the post, this recommendation (with small Apple icon) do not show. And the forum scores are not updated. This is not the first time I get problems with forum notifications. I filed a bug report: FB14172207

I get a crash in Apple Watch simulator (Series 9 45mm 18.0) as soon as the app launch if I type anything on external keyboard (just hitting command key for instance to capture a screenshot). Same crash on series 7 (45mm, OS 18.1) But app works normally when I use mouse to interact with the app on simulator. App does not crash on real device (Watch 4 OS 10.4.1). Nor does it crash on Series 6 simulator (44 mm OS 17.4). Here are the log I could collect (apparently, they contain sensitive language !!! so I attach as a file.: Attached logs

I create a notification with an image attachment: let center = UNUserNotificationCenter.current() center.delegate = self let content = UNMutableNotificationContent() // some more stuff… let paths = NSSearchPathForDirectoriesInDomains( FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true) let documentsDirectory = paths[0] as NSString let fileExtPNG = "#" + "\(imageName)" + " photo.png" let fileNamePNG = documentsDirectory.appendingPathComponent(fileExtPNG) as String url = URL(fileURLWithPath: fileNamePNG) let attachment = try UNNotificationAttachment(identifier: "Image", url: url, options: nil) content.attachments = [attachment] I then add the request: let request = UNNotificationRequest(identifier:requestIdentifier, content: content, trigger: nil) center.removePendingNotificationRequests(withIdentifiers: [requestIdentifier]) center.add(request) {(error) in } Problem: when I later test (once notification has been registered), the file do not exist anymore at the url. I've commented out the add request to confirm. I have a work around, by creating a temporary copy of the file at the URL and pass it in the attachment. Then, everything works fine and the copy is deleted. But that's a bit bizarre. What am I missing here ?

I'm struggling to implement required code for SB2420 compliance. I try to learn on a very simple use case. the app is UIKit Build in Xcode 26.2 it displays a single Hello view with a button that will simply show a "Good day" label. I assume the app will be rated 4+. I tried the following code, using available information in Xcode (limited): import UIKit import DeclaredAgeRange // other import needed ? class ViewController: UIViewController { @IBOutlet weak var welcomeLabel: UILabel! // initially hidden override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. } func testAgeRange() -> Bool { if !isEligibleForAgeFeatures { // Not found. Which import needed ? return true // Not called from Texas } // Following code from Xcode doc… do { let response = try await AgeRangeService.shared.requestAgeRange(ageGates: 13, 15, 18) // Compiler Error: Missing argument for parameter 'in' in call // Can I add the 4 gate ? guard let lowerBound = response.lowerBound else { // Allow access to under 13 features. return false } var ok = false if lowerBound >= 18 { // Not needed ? // Allow access to 18+ features. ok = true } else if lowerBound >= 15 { // Not needed ? // Allow access to 15+ features. ok = true } else if lowerBound >= 13 { // Not needed ? // Require parental consent ? // Allow access to 13+ features. ok = true // if consent OK } else { // Require parental consent ? // Show age-appropriate content ok = true // if consent OK } return ok // Authorized for all 4+ } catch AgeRangeService.Error.notAvailable { // No age range provided. return false } } func executeStart() { welcomeLabel.isHidden = false } @IBAction func start(_ sender: UIButton) { if #available(iOS 26.0, *) { if testAgeRange() { // Need to test for parental control here ? } else { // Alert and exit the app ? } } else { // do nothing ? Can we run the app ? } executeStart() } } The logic would be: before allowing action with the start button, check is it IOS 26+ so that we can call API if so, is verification needed (Texas SB2420) if not, we can proceed if required, test age range As app is 4+, all ranges should be OK But need to test parental control Now, many pending questions in code: line 14: get an error: Cannot find 'isEligibleForAgeFeatures' in scope line 19: I used the documentation sample for AgeRangeService, but get a Compiler Error: Missing argument for parameter 'in' in call line 35: how to implement parental control ? In addition, in the metadata of the app, should I declare that parental control ? Age verification? Mechanism for confirming that a person's age meets the age requirement for accessing content or services As there is no restriction on age, is it required ? Any help welcomed as well as link to a comprehensive tutorial.

I need to encode and decode Array<Array> SomeStruct is multiplexed in an Int The former API did work: if let format = decoder.decodeObject(forKey: someKey) as? Array<Array<SomeStruct>> { } But using the new API if let format = decoder.decodeObject(of: Array<Array<Int>>.self, forKey: someKey) { generates an error: Cannot convert value of type 'Array<Array<Int>>.Type' to expected argument type '[AnyClass]' (aka 'Array<any AnyObject.Type>') encoding is done as follows: var format = Array(repeating: Array(repeating: 0, count: 4), count: 4) // initialize the var coder.encode(format, forKey: someKey) What is the correct syntax ?

Do you use third party framweworks, like Alamofire ?

One of my production Mac is still on Mojave. I want to update to Catalina and not Big Sur (waiting for dust to settle down). Automatic update from system preferences only proposes Big Sur as well as some patch updates for MacOS 10.14.6 What is the safe and sure way to update from Mojave to the latest Catalina ?