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Reply to Capturing file read events in Endpoint Security client
Following the topic of intercepting file access events: could you suggest other technologies that are better suited to achieve this goal? So, I think the big question here is what are you actually trying to do“? The core problem here is that: Read I/O is REALLY frequent, so the system doesn't want to do anything that would make it slower/more complicated. Memory mapping makes the idea of tracking reads somewhat... questionable. As the most extreme example of this, take the file that's the backing libsystem.dylib. EVERY (yes, EVERY) process in the system has mapped it into memory and is accessing it very frequently. Tying any I/O activity on that file to any specific process isn't really possible or meaningful. Even if you could track actual I/O activity (meaning, read from disks) and tie it to a particular process, all that would tell you is which process happened to ask for a page I didn't have. It wouldn't tell you anything about the other X processes that accessed the data directly from VM without
Topic: App & System Services SubTopic: Core OS Tags:
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AppIntent, StartWorkoutIntent, and Siri
I'm a bit confused as to what we're supposed to be doing to support starting a workout using Siri in iOS/watchOS 26. On one hand, I see a big push to move towards App Intents and shortcuts rather than SiriKit. On the other hand, I see that some of the things I would expect to work with App Intents well... don't work. BUT - I'm also not sure it isn't just developer error on my part. Here are some assertions that I'm hoping someone more skilled and knowledgable can correct me on: Currently the StartWorkoutIntent only serves the Action button on the Watch Ultra. It cannot be used to register Shortcuts, nor does Siri respond to it. I can use objects inherited from AppIntent to create shortcuts, but this requires an additional permission to run a shortcut if a user starts a workout with Siri. AppIntent shortcuts requires the user to say Start a workout in - if the user leaves out the in part, Siri will not prompt the user to select my app. If I want to allow the user to simply say Start a Workout and ha
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Reply to Huge timeout values from a failed DiskIO call
First off, as a quick confirmation, do you see this behavior when you’re using another Mac as the SMB server? I don't think you will, but that's worth confirming. Is there any other way to set the timeout for obtaining these durable handles for macOS? Just to be clear, I'm guessing that the durable handle timeout is what's involved here, but I don't know for sure. However, assuming this is a non-Mac SMB server, then I would start by looking at the configuration the server presents to the Mac. Or is there a way to obtain a non-durable handle? I think passing O_EVTONLY into open would work; however, I'm not sure that's really usable for I/O. Note that the other option here would also be to pass in O_NONBLOCK and shift to non-blocking I/O. __ Kevin Elliott DTS Engineer, CoreOS/Hardware
Topic: App & System Services SubTopic: Core OS Tags:
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Different toolbar item placement for iPhone vs iPad
On iPhone, I would like to have a more button at the top right of the navigation bar, a search field in the bottom toolbar, and a plus button to the right of the search field. I've achieved this via the code below. But on iPad they should be in the navigation bar at the trailing edge from left to right: plus, more, search field. Just like the Shortcuts app, if there's not enough horizontal space, the search field should collapse into a button, and with even smaller space the search bar should become full-width under the navigation bar. Right now on iPad the search bar is full width under the navigation bar, more at top right, plus at bottom middle, no matter how big the window is. How can I achieve that? Any way to specify them for the system to more automatically do the right thing, or would I need to check specifically for iPhone vs iPad UIDevice to change the code? struct ContentView: View { @State private var searchText = var body: some View { NavigationStack { VStack { Text(Hello, world!) } .na
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Reply to SwiftData Inheritance Query Specialized Model
Nice to know that the original issue goes away in the latest Beta. Regarding the crash triggered by the access to Item.children, if you can provide a runnable code snippet to demo the issue, I'll take another look. You have mentioned a few classes with inheritance, and so I think it is probably worth mentioning that over-using inheritance may impact your app's performance negatively. Concretely, with today's default store (DefaultStore), all the types in an inheritance hierarchy are persisted with one single table in SQLite. If your inheritance hierarchy has many classes, the table (columns and data) can be quite big, which can slow down the performance of fetching and inserting data. That being said, when adopting SwiftData inheritance, you might examine if that is a right use case. This WWDC25 session(starting from around 4:25) covers this topic a bit. You can take a look, if haven't yet. Best, —— Ziqiao Chen  Worldwide Developer Relations.
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Icon Composer's minimum window size is too big for smaller MacBook video modes
I've filed a FB already through standard channels (FB ID: FB19032008) but I'll post it here in case it may get some attention from others experiencing similar issues. On macOS 26 Beta 5 and Xcode 26 Beta 5 (and earlier revisions afaik) Icon Composer specifies a minimum window size that greatly exceeds the bounds of the 1280x800/832pt video modes available on 13in MacBooks, and which also is too large for the default 1440x900 video mode on non-notched 13in MacBook Air/Pro models as this causes a default-size 64pt dock to occlude the window. I've attached screenshots depicting this behaviour in the two above described cases. Best solution seems like reducing min window size to something that will fit reasonably in a 1280x800pt viewport including the dock and menu bar (e.g. 1000x600 or something).
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Reply to HTTPS Connection Issues Following iOS 26 Beta 6 Update
First up, I want to pass along a big “thank you” from the folks who manage our CT infrastructure. Your bug let them quickly identify the root cause of this issue, which is a configuration problem at our end O-: The timing of this is a bit tricky. I can’t predict the future, obviously, but there may be a short window (weeks not months) between the release of iOS 26 and the release of this fix where your customers are affected by the issue. If that’s likely to cause you significant grief, you’ll need a workaround. To understand the workaround I need to explain a little bit about the bug… The bug you’ve found means that iOS won’t trust certificates issued by your CA in the 8 hours between 2026-07-01 00:00:00 GMT and 2026-07-01 08:00:00 GMT. And lo! your server’s certificate just happens to expire in that range: % openssl x509 -inform der -in leaf.cer -text … Validity Not Before: May 30 06:03:02 2025 GMT Not After : Jul 1 06:03:01 2026 GMT … That’s just bad luck )-: The workaround is to ask your CA to is
Topic: Privacy & Security SubTopic: General Tags:
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VNOP_MONITOR+vnode_notify() operation details
After perusing the sources of Apple's SMB and NFS clients' implementation of VNOP_MONITOR, my understanding of how VNOP_MONITOR+vnode_notify() operate is as follows: A user-space process advertises an interest in monitoring a file or directory via kqueue(2)/kevent(2). VFS calls the filesystem's implementation of VNOP_MONITOR. VNOP_MONITOR forwards the commencing or terminating of monitoring events request to the filesystem server. Network filesystem client nodes call vnode_notify() to notify the underlying VFS of a filesystem event, e.g. file/directory creation/removal, etc. What I'm still vague about is how does the server communicate back to client nodes that an event of interest has occurred? I'd appreciate being enlightened on the operation of `VNOP_MONITOR+vnode_notify()' in a network filesystem setting.
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Reply to "Assertion failed: (false) function _onqueue_rdar53306264_addWaiter file TubeManager.cpp line 1042" Crash
It’s better to reply as a reply, rather than in the comments; see Quinn’s Top Ten DevForums Tips for this and other titbits. What modifications can we make to prevent this issue from reoccurring? Honestly, I’ve no idea. Earlier I wrote: [quote='854100022, DTS Engineer, /thread/796647?answerId=854100022#854100022'] Historically this crash has been triggered by a range of concurrency problems within CFNetwork [/quote] The nature of concurrency bugs is that they can come and go based on hard to understand criteria. Consider this thought experiment: CFNetwork has a concurrency bug that causes this crash. The bug is highly dependent on network timing. You see a huge uptick of crash reports in your app during late November and late December. This might be nothing to do with your code, or your infrastructure. Rather, a big chunk of your users are travelling in late November and late December due to the US Thanksgiving and Christmas holidays. While travelling they’re on WWAN rather than Wi-Fi, which disrupts
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New window scenes on iPad always take the size of the activating window
I'm using multiple scenes in my iPad app. When I open a new scene from my main window, that new window is always the same size as the previous window. When I make the main window very small and then create a new scene, that new window is also tiny. When I make the main window very big, you guessed it. UIWindowScene.sizeRestrictions does not seem to help here. How can I give new windows a default size (it's okay if they're resizable after presenting)? This is such a weird behavior. Video of the problem in action: https://mastodon.social/@nicoreese/115033539035249909
Topic: UI Frameworks SubTopic: UIKit Tags:
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UITabBar in iOS 26 is Too Big for Touch ID Devices
I do the majority of my test development on an iPhone 16 Pro in the iOS Simulator. As part of my UI rework to maintain compatibility with iOS 26 I decided to run on an older device with a small screen size for testing. The smallest device that supports iOS 26 is the iPhone SE 2nd Gen and 3rd Gen. Take a look at the image below: On the left is the iPhone SE 2nd Gen. On the right iPhone 16 Pro. It looks like the UITabBar which is from a UITabBarController is sized too tall. The actual Tab Bar itself is 62px while the container that houses it is 83px. Yes there should be some top/bottom space to allow for the Liquid Glass Effect to overlap as it often spills outside it's bounds but this feels like far too much. Looking at them side by side, the iPhone SE Tab Bar actually takes up more space which is not ideal for users who are working on a smaller screen to begin with and have less real estate. It looks like the bottom space is allowable room for the 'swipe to dismiss line' however these devices use Touch ID and
Topic: UI Frameworks SubTopic: UIKit Tags:
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Reply to Xcode 26 Beta 5 XIB Compiler outputs NIBs with dependency on class that isn't available pre-macOS 26
@FxFactory Thanks. It's infuriating that this kind of thing gets through QA because Apple turns right around and tells anyone who will listen that the billions of dollars they steal from third-party developers are needed to support all the APIs and tools that they offer. Tools that are frequently crippled and broken. The only way I've ever had any success getting Xcode/compiler bugs addressed is by emailing the head of the Developer Tools team directly and copying Craig on those emails. If you make a big enough visible stink at the company, you can get things seen. Update: I can confirm that it's sufficient to compile on any Mac running macOS 15.x. The architecture doesn't matter (which would have been extremely surprising.)
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Reply to Compile Failure on NSXPCInterface Initializer
Well, that’s interesting. I’ve seen a raft of weird problems with C++ interop, but this specific one doesn’t ring any bells. And it’s still weird that you only see it on one machine. I tried reproducing this with a simple test project here in my office — using both XCTest and Swift Testing — and couldn’t. But that’s not a big surprise because of the above-mentioned mystery. The next step is to start gutting your main app. That’ll either reveal more interesting info about what’s triggering the problem, or it’ll get you to a small test project that you can share with us for further analysis. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = eskimo + 1 + @ + apple.com
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Reply to Xcode Signing and Capabilities
[quote='853194022, cameronbanga, /thread/750297?answerId=853194022#853194022, /profile/cameronbanga'] all of the documentation seems to indicate that Individual accounts should behavior just like Organization accounts. [/quote] Not all the documentation. The doc I linked to above is pretty clear about this limitation. Anyway, regarding your big picture issue, I’ve replied on the the thread you started for that. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = eskimo + 1 + @ + apple.com
Topic: Code Signing SubTopic: General Tags:
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