When working with this example code from Apple Implementing Interactions Between Users in Close Proximity, the example comes by default in Swift5, however when I switch to Swift6, the example would crash. I also observed the same crash in my personal project (this is why I tried the example code), currently blocking me. To repro: Download sample code from link Go to build settings and use Swift 6 Go to AppDelegate and change @UIApplicationMain to @main as this is required for Swift 6. Run the sample app on 2 iOS devices. Observe the crash: Thread 1 Queue : com.apple.main-thread (serial) Thread 5 Queue : TPC issue queue (serial) com.apple.uikit.eventfetch-threadThread 11 Queue : com.apple.MCSession.syncQueue (serial) Thread 15 Queue : com.apple.MCSession.callbackQueue (serial) #0 0x00000001010738e4 in _dispatch_assert_queue_fail () #1 0x00000001010aa018 in dispatch_assert_queue$V2.cold.1 () #2 0x0000000101073868 in dispatch_assert_queue () #3 0x000000019381f03c in _swift_task_checkIsolatedSwift () #4 0x000000019387f21c in swift_task_isCurrentExecutorWithFlagsImpl () #5 0x000000019381ed88 in _checkExpectedExecutor () #6 0x0000000101016d48 in @objc MPCSession.session(_:peer:didChange:) () #7 0x000000024a09f758 in __56-[MCSession syncPeer:changeStateTo:shouldForceCallback:]_block_invoke () #8 0x000000010107063c in _dispatch_call_block_and_release () #9 0x000000010108a2d0 in _dispatch_client_callout () #10 0x0000000101078b4c in _dispatch_lane_serial_drain () #11 0x00000001010797d4 in _dispatch_lane_invoke () #12 0x0000000101085b20 in _dispatch_root_queue_drain_deferred_wlh () #13 0x00000001010851c4 in _dispatch_workloop_worker_thread () #14 0x00000001f01633b8 in _pthread_wqthread () Enqueued from com.apple.MCSession.syncQueue (Thread 11) Queue : com.apple.MCSession.syncQueue (serial) #0 0x0000000101075be0 in dispatch_async () #1 0x000000024a09f660 in -[MCSession syncPeer:changeStateTo:shouldForceCallback:] () #2 0x000000024a0a365c in __63-[MCSession nearbyConnectionDataForPeer:withCompletionHandler:]_block_invoke () #3 0x000000010107063c in _dispatch_call_block_and_release () #4 0x000000010108a2d0 in _dispatch_client_callout () #5 0x0000000101078b4c in _dispatch_lane_serial_drain () #6 0x00000001010797d4 in _dispatch_lane_invoke () #7 0x0000000101085b20 in _dispatch_root_queue_drain_deferred_wlh () #8 0x00000001010851c4 in _dispatch_workloop_worker_thread () #9 0x00000001f01633b8 in _pthread_wqthread () #10 0x00000001f01628c0 in start_wqthread () Enqueued from com.apple.main-thread (Thread 1) Queue : com.apple.main-thread (serial) #0 0x0000000101075be0 in dispatch_async () #1 0x000000024a0a352c in -[MCSession nearbyConnectionDataForPeer:withCompletionHandler:] () #2 0x000000024a0bb8c0 in __55-[MCNearbyServiceAdvertiser syncHandleInvite:fromPeer:]_block_invoke_2 () #3 0x0000000101018004 in thunk for @escaping @callee_unowned @convention(block) (@unowned ObjCBool, @unowned MCSession?) -> () () #4 0x0000000101017db0 in MPCSession.advertiser(_:didReceiveInvitationFromPeer:withContext:invitationHandler:) at /Users/lyt/Downloads/ImplementingInteractionsBetweenUsersInCloseProximity/NIPeekaboo/MultipeerConnectivitySupport/MPCSession.swift:161 #5 0x0000000101017f74 in @objc MPCSession.advertiser(_:didReceiveInvitationFromPeer:withContext:invitationHandler:) () #6 0x000000024a0bb784 in __55-[MCNearbyServiceAdvertiser syncHandleInvite:fromPeer:]_block_invoke () #7 0x000000010107063c in _dispatch_call_block_and_release () #8 0x000000010108a2d0 in _dispatch_client_callout () #9 0x00000001010ab4c0 in _dispatch_main_queue_drain.cold.5 () #10 0x0000000101080778 in _dispatch_main_queue_drain () #11 0x00000001010806b4 in _dispatch_main_queue_callback_4CF () #12 0x0000000195380520 in __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ () #13 0x0000000195332d14 in __CFRunLoopRun () #14 0x0000000195331c44 in _CFRunLoopRunSpecificWithOptions () #15 0x0000000234706498 in GSEventRunModal () #16 0x000000019acacddc in -[UIApplication _run] () #17 0x000000019ac51b0c in UIApplicationMain () #18 0x000000019ad8d860 in ___lldb_unnamed_symbol296044 () #19 0x000000010101a680 in static UIApplicationDelegate.main() () #20 0x000000010101a5f0 in static AppDelegate.$main() () #21 0x000000010101a7bc in main () #22 0x00000001923aae28 in start () com.apple.multipeerconnectivity.gcksession.recvproccom.apple.multipeerconnectivity.gcksession.sendproccom.apple.multipeerconnectivity.eventcallback.eventcbproccom.apple.CFSocket.privatecom.apple.CFStream.LegacyThreadcom.apple.NSURLConnectionLoader

I'm using RealityView in my iOS game mxied with SwiftUI. For the following 2 example usages, the simulator will only render the first RealityView, and the second one is either super laggy or show a black model. Running on the real device is all good, just simualtor has this issue. Have a TabView and each tab has a RealityView. Have a root view and detail view connected via a push navigation, both root and detail have a RealityView. In the Simulator, the second RealityView is going to be very choppy and basically unusable, but on a real iPhone everything looks great. Is this a known simulator issue or I did something bad?

I have a Package.swift // swift-tools-version: 5.9 // The swift-tools-version declares the minimum version of Swift required to build this package. import PackageDescription let package = Package( name: "SharedUI", defaultLocalization: "en_US", platforms: [.iOS(.v16)], products: [ .library( name: "SharedUI", targets: [ "AppTheme", ] ), ], dependencies: [ .package(url: "https://github.com/apple/swift-markdown.git", "0.2.0"..<"0.3.0"), ], targets: [ .target( name: "AppTheme", dependencies: [ .product(name: "Markdown", package: "swift-markdown"), ], path: "AppTheme" ), ] ) Run swift package show-dependencies shows error yuantong-macbookpro2:Downloads yuantong$ swift package show-dependencies Fetching https://github.com/apple/swift-markdown.git from cache Fetched https://github.com/apple/swift-markdown.git (0.67s) error: Couldn’t get the list of tags: fatal: cannot use bare repository '/Users/yuantong/Downloads/.build/repositories/swift-markdown-b692ce3c' (safe.bareRepository is 'explicit') which I think used to work before Xcode 15.

I have some trouble to use this API https://developer.apple.com/documentation/xctest/xcuisystem/4108234-open in UI testing. Calling this API that opens my app but a system dialog Open in "MyApp" will show. XCUIDevice.shared.system.open(url) is a sync API, so I can't use my test to tap on the "Open" button on the dialog. This basically makes the API unusable, are there some way to bypass this system dialog?