User is using my app, the goes to System Settings, and changes some of my App's settings (switches, text fields, etc). Does the system send my app any kind of notification? David PS: I tried all kinds of searches on this and found nothing.

Select the Project in leftmost pane, open right most pane where Project Document is shown. My (quite old) project has the Project Format set to "Xcode 3.2" (which amazingly I used at one point!). I changed it to "Xcode 16.3", and even selected "Minimize Project References", closed the project, then re-opened it. However, the size of the "project.pbxproj" file didn't change at all. I'm told the newer formats reduce project size as well as reduce merge conflicts when new files are added to the project. Is there a "compress" option from the command line? Thanks, David

I searched online didn't find anything. David

My company wants to be insure that if my Objective-C to Swift conversions fail in anyway, that the app can revert to using the older Objective-C code. By using a remotely controllable flag, the app can switch which code runs as, both are compiled into the app. Essentially, I create a protocol that describes the original class, then both classes (with a "s" or "o" appended to them) conform to the protocol. Protocol: Object Objective-C class: oObject Swift class: sObject That said, I hit one issue that I just can't seem reason out. I create a Objective-C function that returns the appropriate class: Class<Object> classObject(void) { if (myFlag) { return [sObject class]; } else { return [oObject class]; } } Swift deals with this really well - I can create an initialized object using: let object = classObject().init() but I cannot find a way to do this in Objective-C: Object *object = [[classSalesForceData() alloc] init]; fails with "No known class method for selector 'alloc'" Is there a way to do this? David PS: my workaround is to return an allocated object: Object *createObject(void) { if (myFlag) { return [sObject alloc]; } else { return [oObject alloc]; } }

In my case there are three interfaces. I had a mental model that I now believe is incorrect. If any of the 3 interfaces is "satisfied", then I get one message telling me so. I guess if that one interface goes down, then I should get a second message that tells me that (this is hard to test as Xcode keeps disconnecting from my device when I switch to Settings to change things). in my case, wifi and cellular are both on. I launch the app, get notified that wifi is satisfied, but nothing on cellular. So my guess is there is a hierarchy: wired, wifi, and cellular. If the highest priority path is available, the others are assumed "off" since you have a path. Thus, you will never get "satisfied" for more than one path. Correct?

Note that AsyncDNSResolver is a fairly new Apple sponsored framework (search for it). I am trying to resolve a hostname (behind a CNAME) but cannot. In face even "ping" in mac Terminal can't. The host I start with is apidev.leaptodigital.com - when I ask for its CNAME: resolver.queryCNAME(name: "apidev.leaptodigital.com") I get: salespro-dev-server-2.eba-uxpxmksr.us-east-1.elasticbeanstalk.com Great! But nothing I try with that hostname returns an IP address. I tried queryCNAME again, then queryA, then queryAAAA. Yet I can send http traffic to this host, so its getting resolved somewhere. Note that nslookup in Terminal finds it just fine. David PS: tried older APIs like CFHostStartInfoResolution but they don't return anything either. Did not try getHostName as its use is discouraged.

I'm sorta baffled right now. I am trying to wonder how I might detect a updated SQL Store in an older app. have a baseline app, and create a SQL-based repository in an updated app, change the model and verify that you can see the updated model version. Using lightweight migration re-run the older app (which will inherit the newer SQL repository). YIKES - no error when creating the NSPersistenStoreCoordinator! Nothing in the metadata to imply the store is newer than the model: [_persistentStoreCoordinator metadataForPersistentStore:store] My question: is there any way to detect this condition? David

Have an app in the store - 10K users. Using the same algorithm for years to download objects, convert them to ManagedObjects, then save them in a context. Been using the exact same Objective-C code for over 5 years - no changes. We build the app with Xcode 15.1, release it a few weeks ago, then slowly start getting reports of the app won't boot. Run the app in 15.1, look at memory usage, and it's a flat line up. But the code is littered with autorelease statements. For this download, max memory was 2.3G! No wonder so many users crashing! [Worked two weekends straight to get this fixed, but why did it happen???] The last developer told me he added those to reduce memory pressure, and that they worked for him. (Unfortunately no old memory usage graphs). But look at the attached image - memory usage increments in a straight line - no saw tooth where memory would get released. Oh, and this is in one runloop on the main thread (don't blame me, I didn't write the original code!):

Have an app that has a half dozen models. We created a new app version with a new model that has an additional property on one entity. The options for the persistent store: do { let options = [ NSMigratePersistentStoresAutomaticallyOption: NSNumber(value: true), NSInferMappingModelAutomaticallyOption: NSNumber(value: true) ] let _ = try persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: storeURL, options: options) } catch { try? FileManager.default.removeItem(at: storeURL) //Erase old sqlite // Make new persistent store for future saves let _ = try? persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: storeURL, options: nil) } Launch this with data from a previous version. A breakpoint in the catch block never triggers so the migration must have worked. Since I'm in development, what happens if I run a different branch that doesn't have the new model? I assume the catch block is going to trigger—but it doesn't! Why doesn't it trigger? Does Core Data essentially ignore the new entity property, so all is well? I was just surprised ...

I'm getting infrequent crashes when I try to show a newly created PDF. The PDF is file based, and shortly after UIGraphicsEndPDFContext its shown. The crash reports make it appear that the file itself is being mutated after its displayed. So my question: is the file (self.filePath) absolutely flushed and closed when UIGraphicsEndPDFContext returns? If not, is there some way to detect when it has finished? Thanks! David `func addPageNumbers() { let url = URL(fileURLWithPath: filePath) guard let document = CGPDFDocument(url as CFURL) else { return } // You have to change the file path otherwise it can cause blank white pages to be drawn. self.filePath = "\(filePath)-final.pdf" UIGraphicsBeginPDFContextToFile(filePath, .zero, nil) let pageCount = document.numberOfPages for i in 1...pageCount { ... } } UIGraphicsEndPDFContext() }

Some confusion in my company on this scenario: current users are on 1.0.0 - have been for months Apple approves our latest build, say 1.1.0, and we release to the App Store with "Slow Rollout" a few days later, one of the first 1% reports a serious bug the dev team immediately fixes the bug, QA approves it, and we upload a new 1.1.1 release the same day we ask Apple for expedited approval, and that happens in 3 hours we select "Release 1.1.1 on Slow Rollout" on the App Store. So what then? My understanding is that once 1.1.1 is released, since 1.1.0 is the "Official Release", that anyone with auto update turned on will update quickly to 1.1.0, and that then some of those users will be put into the "1.1.1 slow roll out candidate pool)". Others have opined that I'm wrong - that most users will stay at 1.0.0, and the new 1.1.1 candidate pool will be users on both 1.0.0 and 1.1.0. Would love to hear someone reply who knows what Apple will really do.

Have an app with Storyboards that use a few customer fonts (Poppins and FontAwesome). No issues at all in Xcode 14. Updated to Xcode 15, and can build clean and run no issues reported. But many of the buttons and labels have the incorrect custom Font assigned - instead of FontAwesome, the get assigned Poppin. In a few cases FontAwesome is used, but the incorrect weight (I log the button font in awakeFromNib. I've looked at the Storyboard XML, it looks fine, and if I set the font to some system font all works fine. Setting it to a system font, then back to FontAwesome does not fix anything, and the XML looks identical to what it was before. I'm at a total loss as to what to do next. Any suggestions most appreciated. PS: in awakeFromNib, I can set the font to the correct FontAwsome font, and the control shows as it should. So the font works from code, not from the Storyboard.

App build with latest Xcode latest MacOS, deployment is iOS 14. It seems that in one App update, the search bar moved from centered low near the bottom of the NavigationBar to the right of the rightBarButtons. Previously we saw this: Now we get this with the exact same code: I dug around the UINavigationItem documentation, and there is a new property that lets you set the preferred placement: if (@available(iOS 16.0, *)) { navigationItem.preferredSearchBarPlacement = UINavigationItemSearchBarPlacementStacked; } That restore what our users use to see. But it will only work if the user is on iOS 16 - is there someway to get the old behavior on iOS 14+? We directly set the navItem's searchBar: navigationItem.searchController = searchController David PS: I have to believe something changed in the iOS frameworks that caused this - our code hasn't changed in this area for years.

I'm getting this error in the console: *** -[__NSCFString substringWithRange:]: Range {18446744073709551615, 1} out of bounds; string length 43. This will become an exception for apps linked after 10.10 and iOS 8. Warning shown once per app execution. Great! So I created a category on NSString for _substringWithRange and _xxx_stringByReplacingCharactersInRange that call the original method (note undescore), then changed every usage in my app to use my own method, in which I test for location == NSNotFound. Nothing. So I swizzled both methods, and again tested for NSNotFound, and again nothing. What can I do to break when this error happens? Thanks David

Some camera vendors support a FAT interface over a Lightning to camera/usb port. This would let an iOS app read files off the camera using a document browser (and it works just fine). The files are huge videos, and in some cases take over 50% of the record time to transfer over WiFi. One vendor unfortunately does not support this. They run PTP over their USB-C to Lightning cable, which means that Photos (or maybe Files, unsure now, I did verify it a while ago) on iOS can see and transfer the files. But my app is SOL - there is no apparent way to do this per Quinn. However - suppose the vendor would get certified with Apple as an ExternalAccessory - my app could then access the camera through some method they would support. This is going to be a tough sell, and just wondering what the minimal amount of technical work would be required on the vendors part to allow file retrieval.