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Stay connected to Medical BLE device in background
I work for a large medical device company. We have a 1st party BLE enabled medical device that must be very battery efficient. To this end, if a connection is lost, the BLE radio is powered down after 60 seconds and will only turn back on when a physical button on the device is pressed. I've been tasked with connecting to the device, staying connected to the device, and being able to retrieve data from the device upon a timed action. For instance, this could include a data read and transmission while they sleep. The key part of this is staying reliably connected for extended periods of time. This is a BYOD setup, and we cannot control power profiles. I would very much appreciate any information, recommendations, and/or insights into solving this problem. Thanks!
Topic: App & System Services SubTopic: Processes & Concurrency Tags:
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Reply to Stay connected to Medical BLE device in background
The ability to stay connected to a BLE device is not something that can be enhanced via an app. A whole lot will depend on the hardware, like antenna design; environment, like distance, RF interference; materials between the two devices; and various connection parameters including but not limited to the power profiles. Assuming you have no control whatsoever on any of these, the only thing you can do in the app is to make sure you are able to connect as quickly as possible when (not if) the connection drops. This means you need to make sure you have implemented Bluetooth State Restoration, so your app gets relaunched even if the app has been terminated in the background by the system. The document Performing Long-Term Actions in the Background explains how to implement this. The second thing you need to do is to make sure you issue a connectPeripheral command as soon as your app gets the callback that the connection has dropped. It is advisable to keep the CBPeripheral object from the last connection and send
Topic: App & System Services SubTopic: Processes & Concurrency Tags:
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Reply to editing Makefile in Xcode editor
Thanks for the comments/answers. I assumed that the type of file should be set by the Open as context menu. But, I now understand to use the file inspector to set the type. I still have a bit of an issue that in one of my projects, the editor aggressively suggests text completion with swift entities.
Topic: Developer Tools & Services SubTopic: Xcode
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Reply to Icon Composer icons together with iOS 18 icons
As posted in the other thread Steve4442 linked to: The way to go is the following (as John Siracusa) noted on Mastodon: Name your Tahoe .icon file the same as the name of your existing .appiconset in the Assets catalog. Set the ASSETCATALOG_OTHER_FLAGS build setting to: --enable-icon-stack-fallback-generation=disabled I can confirm that the Asset Catalog Other Flags still works with Xcode 26 RC! I’ve submitted two apps with that flag and both got approved by Apple. The App Store even displays the old icon in the iOS/macOS 18 App Store and the new icon in the iOS/macOS 26 App Store. You can see an example here in one of my apps.
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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Icon Composer: Any way to add icons to the app bundle for older macOS versions?
Several app developers are struggling with the inability to provide a separate app icons that looks nice on older macOS versions while at the same time provide Icon Composer icons that look great on macOS Tahoe 26. An ability to provide separate icons is super important to those who have app icons that follow the curvature of the default icon borders (as the corner rounding radius is different for Sequia and Tahoe). Take a look at this for example: https://github.com/ghostty-org/ghostty/issues/7564#issuecomment-3042061547 Question: Is there a definitive/recommended way to address this issue? How can a developer add a glass icon variant that looks good on Tahoe and provide a bitmap icon for older macOS versions? Some background info: Prior to Xcode 26 beta 4, one could add an App Icon to Assets to be used as app icon for legacy macOS versions (Sequia and older) and use a new Icon Composer icon (placed in the project root) for macOS Tahoe 26. Enabling Include all app
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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Reply to Icon Composer: Any way to add icons to the app bundle for older macOS versions?
Just want to confirm that the Asset Catalog Other Flags still works with Xcode 26 RC! I’ve submitted two apps with that flag and both got approved by Apple. The App Store even displays the old icon in the iOS/macOS 18 App Store and the new icon in the iOS/macOS 26 App Store. You can see an example here in one of my apps. So, to summarize in John Siracusa’s words again: Name your Tahoe .icon file the same as the name of your existing .appiconset in the Assets catalog. Set the ASSETCATALOG_OTHER_FLAGS build setting to: --enable-icon-stack-fallback-generation=disabled
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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How to add blur around the Tab bar in iOS 26
I have a TabView and in one of the tabs I have a horizontal ScrollView that uses .scrollTargetBehavior(.paging) in each of those pages I have a List, but the bottom of the list around the Tab bar doesnt get blurred, if I remove the horizontal scrollview and just have a list it blurs fine. So I want to know how I can manually add the blur when using the horizontal scrollview
Topic: UI Frameworks SubTopic: SwiftUI Tags:
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Unable to install “My App” after installing iOS 26, macOS 26, Xcode 26.
Error: Unable to install “My App” Failed to install embedded profile for com.apple.myapp : 0xe800801a (This provisioning profile does not have a valid signature (or it has a valid, but untrusted signature).) I've tried almost everything, but I keep getting the same message on a Mac Mini M1 and several physical iPhones (11 and 16, both Pro). On a MacBook Air (Sequoia 15.7) with the same account, the same profiles work without any problems; and on simulators with iOS 26, it also works without any problems. This clearly tells us that the provisioning profile is not the problem, which is what the message mentions. It obviously has to do with the 26 update. P.S All of this worked fine before installing iOS, macOS, and Xcode 26.
Topic: Developer Tools & Services SubTopic: Xcode
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Inheritance in SwiftData — Fatal error: Never access a full future backing data
I'm implementing SwiftData with inheritance in an app. I have an Entity class with a property name. This class is inherited by two other classes: Store and Person. The Entity model has a one-to-many relationship with a Transaction class. I can list all my Entity models in a List with a @Query annotation without a problem. However, then I try to access the name property of an Entity from a Transaction relationship, the app crashes with the following error: Thread 1: Fatal error: Never access a full future backing data - PersistentIdentifier(id: SwiftData.PersistentIdentifier.ID(backing: SwiftData.PersistentIdentifier.PersistentIdentifierBacking.managedObjectID(0x96530ce28d41eb63 ))) with Optional(F07E7E23-F8F0-4CC0-B282-270B5EDDC7F3) From my attempts to fix the issue, I noticed that: The crash seems related to the relationships with classes that has inherit from another class, since it only happens there. When I create new data, I can usually access it without any problem. The crash mostly ha
Topic: App & System Services SubTopic: iCloud & Data Tags:
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Reply to Provisioning problem
I FINALLY got a solution. I've tried everything in all the threads but this is what worked. I went to XCODE, debug, destinations manage destinations. Then I right clicked my physical device. Went to the installed provisional profiles and deleted the existing ones on my phone. Rerun the build and it worked
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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Xcode Cloud timeouts
Hey, We're crunching to get our products ready for the announcements next week but are being slowed down by Xcode Cloud. Builds are failing and are extremely slow. We're using the latest Xcode beta and latest macOS release so we can upload our builds continuously to TestFlight. We're seeing builds taking up to almost an hour, even though takes around 10-15 minutes when it doesn't fail. The errors we're seeing seem to be timeout, for example: Showing All Errors Only The step invocation hit a user timeout. The xcodebuild build invocation timed out. No activity has been detected on stdout, stderr or the result bundle in 30 minutes. Here are links to some builds which have been restarted multiple times but keep failing for reasons out of our control. Please advice on how to get unblocked. https://appstoreconnect.apple.com/teams/69a6de80-3540-47e3-e053-5b8c7c11a4d1/apps/1102236212/ci/groups/8da12ae3-b454-4810-abe8-829f1af56a54 https://appstoreconnect.apple.com/teams/69a6de80-3540-47e3-e053-5b8c7c11a4d1/ap
Topic: Developer Tools & Services SubTopic: Xcode Cloud Tags:
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