how do i make TextEditor autoscrolled? i want to implement a log view based on it - when the scroll position is at bottom, adding new lines shall autoscroll it upwards so the newly added lines are visible. and when the scroll position is not at bottom - adding new lines shall not autoscroll it.

is this a bug that NSDateFormatter knows about leap days but not about leap seconds? let f = DateFormatter() f.timeZone = TimeZone(identifier: "UTC") f.dateFormat = "yyyy/MM/dd HH:mm:ss" // last leap year let t1 = f.date(from: "2020/02/29 00:00:00") // 2020-02-29 00:00:00 UTC // last leap second let t2 = f.date(from: "2016/12/31 23:59:60") // nil

Tried to ask as a comment in the other thread: https://developer.apple.com/forums/thread/650386?answerId=628394022#reply-to-this-question But can't leave a comment in there for some reason (the thread is locked?). Asking exactly the same question, now for iOS 15. Anything changed in this area? When selecting a stroke path for object on PKCanvas, the option "Snap to Shape" appears. I understand this function is still in beta and has not made available natively to other PencilKit app. Is there a way using Stroke API to call this function directly after the user hold pencil for half a second when stroke is done drawing, just like how it behaves in native apps?

hello, how do i create a virtual microphone on macOS that can be selected as a default input device in System Settings or in apps like FaceTime / QuickTime Player / Skype, etc? is Audio HAL plugin the way to go? i've seen this macOS 10.15 note: "Legacy Core Audio HAL audio hardware plug-ins are no longer supported. Use Audio Server plug-ins for audio drivers." though i am not sure if that's applicable, as i can think of these interpretations: 1 "Legacy Core Audio HAL audio hardware plug-ins are no longer supported (but you can still use non-legacy ones.) 2 "Legacy Core Audio HAL audio hardware plug-ins are no longer supported." (but you can still use non-hardware ones".) 3 "Legacy Core Audio HAL audio hardware plug-ins are no longer supported". (if you used that functionality to implement audio hardware drivers then your you can use Audio Server plug-ins instead, otherwise you are screwed.) The "Audio Server plugin" documentation is minimalistic: https://developer.apple.com/library/archive/qa/qa1811/_index.html which leads to a 2013 sample code: https://developer.apple.com/library/archive/samplecode/AudioDriverExamples/Introduction/Intro.html and contains a "nullAudio" plugin and a kernel extension backed plugin - neither of those i wasn't able to resurrect (i'm on macOS Catalina now). any hints?

hello, i don't think it is provided by the system already so i'd like to implement a smart version of DispatchQueue.async function - the one that will not reschedule the block if i am already on the queue in question and call the block directly instead in this case.  extension DispatchQueue { func asyncSmart(execute: @escaping () -> Void) { if DispatchQueue.current === self { // ????? execute() } else { async(execute: execute) } } } the immediate problem is that there is no way to get the current queue (in order to compare it with the queue parameter and do the logic branch). anyone've been through it and solved this puzzle?

i thought it is impossible to have CallKit show system UI for outgoing calls. but then i saw this: "For incoming and outgoing calls, CallKit displays the same interfaces as the Phone app..." https://developer.apple.com/documentation/callkit how do i present it though? or is this a documentation error?

How do I download a folder from opensource.apple.com without going inside recursively and downloading individual files? e.g. one from here: "https://opensource.apple.com/source/Libm/" PS. no idea what's the proper tag for this post, and as forum insists on having a non-empty tag field I'm using "Foundation" arbitrarily.

This was mentioned in another thread 4 years ago: This whole discussion assumes that every network connection requires a socket. This isn’t the case on most Apple platforms, which have a user-space networking stack that you can access via the Network framework [1]. [1] The one exception here is macOS, where Network framework has to run through the kernel in order to support NKEs. This is one of the reasons we’re in the process of phasing out NKE support, starting with their deprecation in the macOS 10.15 SDK. Is macOS still an unfortunate exception that requires a socket per Network framework's connection?

I'm experiencing some rare crash but only if I enable Xcode's "thread performance checker". The crash typically ends with these lines: std::_1::hash_table<std::_1::hash_value_type<long qosWaiterSignallerInvariantCheck ... and sometimes with "findPrimitiveInfoNoAssert" on the second line. I wonder if I am doing anything wrong, or is it a (hopefully known) issue in thread performance checker itself? It does look like some sort of data race bug, if to guess there's some internal dictionary that's not properly protected with a mutex or something. I'm using Xcode 16.4 running on macOS 15.5, building and running an app on iPhone with iOS 18.5. Cheers!

i have a list like this: id: 1, image: image1, title: title1, badge: 0 id: 2, image: image2, title: title2, badge: 0 id: 3, image: image3, title: title3, badge: 0 ... is my understanding correct that in order to do a smooth "expected" animation when I want to change both the badge of the item and its order i have to manually split this "big" update into two smaller updates (first change then move, or vice versa)? this is somewhat surprising, i would expect a diffable implementation to have a notion of "identity" (in the example above it's "id") and calculate the differences based on that identity plus ite equivalence check rather than just based on the hash/equality check for the whole item.

hello, i know i could be overly paranoid at times.. but is this the case that i need to protect my global memory location (that i read from / write to) with read/write memory barriers even if i'm only accessing that location from a single serial DispatchQueue? considering the fact that GCD can pick a different thread to run operations on that queue, and a further fact that different threads can run on different cores and thus have different L1/L2 caches, so that the barrier unprotected write to a location in one code invocation (that runs on my serial queue, that happens to be bound to thread1/core1 at the time) might not yet be visible to a different invocation of my code that runs a bit later on the same serial GCD queue but it so happens that now it runs on thread2/core2, so that the barrier unprotected read from that global memory location returns some stale data? is the answer any different if we consider a serial (maxConcurrentCount=1) OperationQueue instead of a serial dispatch queue? finally, is the answer any different if we consider a single NSThread / pthread instead of a serial dispatch queue? can a single thread be bound to different cores during its lifetime? (e.g. work on one core, then sleep, then awake on a different core). thank you.

Is it possible to use network from within iOS Thumbnail Extension? I tried - it works fine under simulator, but I'm getting this error when running on real device: networkd_settings_read_from_file Sandbox is preventing this process from reading networkd settings file at "/Library/Preferences/com.apple.networkd.plist", please add an exception. Adding "App Transport Security Settings / Allow Arbitrary Loads" plist entry didn't help. As the error seems to be specific access to a particular file I tried adding "com.apple.security.temporary-exception.files.absolute-path.read-only" but it didn't help and looks like it couldn't help on iOS: "Note: This chapter describes property list keys specific to the macOS implementation of App Sandbox. They are not available in iOS."

Our app has "allow arbitrary loads" in the "App Transport Security Settings" and generally allows both "http" and "https" connections. I want to restrict basic authentication usage to secure connections only, what is the best way to do that? I have URLSessionTaskDelegate's:     func urlSession(_ session: URLSession, task: URLSessionTask, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -&gt; Void) { where I can put the relevant logic, but how do I check if the connection attempt in question is happening over TLS or not? I can check task.currentRequest.url scheme being "http" vs "https", and port being nil vs 80 vs 443, but I hope there is a more robust check.

Given an arbitrary memory address how do I find (in runtime) the nature of memory block it belongs to? For stack addresses I guess there's some "stack start" and "stack end" of the current thread. For other threads' stacks - I guess I'd have to enumerate all threads to get those ranges. I also found that I can use malloc_size and sometimes it gives me correct result (the size if non zero at least), although it doesn't give me the beginning of the block memory address belongs to. For anything else I have no clue at the moment. Ideal method I am looking for: struct MemoryBlock { let type: MemoryBlockType // stack, heap, unmapped, etc let start: UnsafeRawPointer let size: Int let attributes // e.g. red / write } func findMemoryBlock(_ address: UnsafeRawPointer) -> MemoryBlock PS. the language doesn't matter (e.g. can be C) so long as this method works in a swift/obj-c app.

Where's CBAdvDataManufacturerData format documented? It looks like there's the company code stored in little endian order in the first two bytes (referencing the companies found in company_identifiers.yaml on bluetooth site). And the rest is arbitrary? I'd like to see the official documentation about this. Thank you.