In the following simplified app I want to change the status bar color from default black to white (the main iPhone theme is light) but nothing else. I'm partly succeeded doing so, but the theme of keyboard is wrong: when it is first appeared it is good (light) and as soon as i start typing it changes itself to unwanted dark. Is there a way to change just the status bar color but nothing else? Note that I want the status bar color be dynamic - sometimes white, sometimes black depending upon what the app is doing. import SwiftUI struct ContentView: View {     @State var string = "Hello, World"     var body: some View {         TextField("EditableText", text: $string)             .font(.largeTitle)             .frame(maxHeight: 1000)             .navigationTitle("Hello, World")             .background(                 Color(red: 1, green: 0.7, blue: 0.7, opacity: 1)             )             .colorScheme(.light) // attempt to "undo" the effect             .preferredColorScheme(.dark)     } } @main struct NavBarTestApp: App {     var body: some Scene {         WindowGroup {             ContentView()         }     } } PS. I don't mind dropping to UIKit for status bar handling if it is not possible to do it in SwiftUI. The rest of app itself is SwiftUI and it is quite big, here I am showing a stripped down version.

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.

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?) -> 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.

https://developer.apple.com/documentation/foundation/urlcache has this: "Although URLCache instance methods can safely be called from multiple execution contexts at the same time, be aware that methods like  cachedResponse(for:) and storeCachedResponse(_:for:) have an unavoidable race condition when attempting to read or write responses for the same request." What does it mean "unavoidable"? If I put a lock (mutex / NSLock, or similar) in my wrappers on top of "cachedResponse" / "storeCachedResponse" would that avoid the mentioned race condition? Also, what do they mean by "the same request"? A few examples below: let url = URL(string: "https://www.apple.com")! let req1 = URLRequest(url: url) let req2 = req1 // perhaps "the same" let req3 = URLRequest(url: url) // "the same"? let req4 = URLRequest(url: req1.url!) // "the same"? let req5 = URLRequest(url: url, cachePolicy: req1.cachePolicy, timeoutInterval: req1.timeoutInterval) // "the same"? let req6 = URLRequest(url: url, cachePolicy: req1.cachePolicy, timeoutInterval: 1234) // "the same"? let req7 = URLRequest(url: url, cachePolicy: .reloadIgnoringCacheData, timeoutInterval: req1.timeoutInterval) // "the same"? assert(req1 == req2) assert(req1 == req3) assert(req1 == req4) assert(req1 == req5) assert(req1 == req6) // this is ok assert(req1 == req7) // this fails

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?

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."

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

is JSONSerialization.jsonObject(with: inputStream) reliable? sometimes it works fine (e.g. with small objects) and sometimes it blocks forever (easier to get the block with big objects). yet sometimes it works ok even with big objects. tried to call it on a different queue - didn't help.

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.

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.

https://developer.apple.com/library/archive/qa/qa1811/_index.html this is old, i know. can those in the know shed some light on whether the bit about temp/cached location still correct: An AudioServerPlugIn operates in a limited environment. ... Further, the host process is sandboxed. As such, an AudioServerPlugIn may only read files in its bundle in addition to the system libraries and frameworks. It may not access user documents or write to any filesystem locations other than the system's cache and temporary directories as derived through Apple API. i tried to write to temporary folder (obtained with NSTemporaryDirectory and also tried /tmp and /private/tmp) and cached folder (obtained with NSSearchPathForDirectoriesInDomains + cachesDirectory) but everything i tried resulted in permission errors.

what is the best way for a HAL plugin to launch a helper app? i tried the obvious NSWorkspace's launch/openApplication those don't work. HAL plugin works in the context of coreaudiod which makes that tricky.

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?

documentation for the mFramesPerPacket field of AudioStreamBasicDescription has this: https://developer.apple.com/documentation/coreaudiotypes/audiostreambasicdescription/1423257-mframesperpacket?language=objc The number of frames in a packet of audio data. ... For variable bit-rate formats, the value is a larger fixed number, such as 1024 for AAC. is there a definite table somewhere that lists allowed values for codecs like AAC_ELD, Opus, etc? i know that 50 works for AAC_ELD. but that's only because i tried that particular value... maybe 49 or 51 works as well, and i just didn't try those. there must be a documented way or API way to determine allowed values.

Hello, I am implementing my audio HAL plugin based on NullAudio sample code (the fragment attached below). I noticed that the code that implements start/stop counter is never triggered, as if the Core Audio "optimizes" something internally and only calls "start" for the very first client and it only calls stop for the very last client. ClientA starts IO // NullAudio_StartIO is called, ok ClientB starts IO // NullAudio_StartIO is not called? ClientA stops IO // NullAudio_StopIO is not called? ClientB stops IO // NullAudio_StopIO is called, ok That's a problem for me; is there any way around it? I want all starts/stops to know exact number of current clients. static OSStatus NullAudio_StartIO(AudioServerPlugInDriverRef inDriver, AudioObjectID inDeviceObjectID, UInt32 inClientID) { // This call tells the device that IO is starting for the given client. When this routine // returns, the device's clock is running and it is ready to have data read/written. It is // important to note that multiple clients can have IO running on the device at the same time. // So, work only needs to be done when the first client starts. All subsequent starts simply // increment the counter. .... // IO is already running, so just bump the counter ++gDevice_IOIsRunning; // NEVER CALLED } static OSStatus NullAudio_StopIO(AudioServerPlugInDriverRef inDriver, AudioObjectID inDeviceObjectID, UInt32 inClientID) { ... // IO is still running, so just bump the counter --gDevice_IOIsRunning; // NEVER CALLED }