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Apps built with the iOS 27 SDK are no longer offered UIWindowSceneSessionRoleExternalDisplayNonInteractive scenes from the Info.plist scene manifest, so on iOS 27 the external display stayed black while the VM ran on the device. Offer UTMSingleWindowView through the SwiftUI scene accessory API instead; iOS 26 and earlier keep using the Info.plist configuration and UTMExternalSceneDelegate. The delegate now checks for the NonInteractive role explicitly, which is what sessions report since iOS 16, instead of the deprecated constant. Verified on the iPhone 18 Pro simulator (iOS 27.0) with the TVOut screen powered on via simctl: the placeholder window appears on connect and the VM display renders once selected; iPad (A16) on iOS 26.1 is unchanged. Assisted-by: Claude:claude-fable-5-1
Building with the iOS 27 SDK broke the VM toolbar on both iOS 26.1 and iOS 27. On iOS 27 `.buttonStyle(.glass)` with a circle border shape sizes each button from its label, so narrow glyphs got smaller circles than the menus and the implicit gap iOS 26 added between buttons disappeared. On iOS 26.1 the glass adapts to the backdrop and turns almost black over the VM display, leaving only a faint outline of each button. Replace the system glass button style with a custom style that draws the icon in the same fixed frame as the pre-iOS 26 style and applies interactive glass in a circle. A neutral gray tint with white icons keeps the buttons readable over both dark and light guest content on either runtime. Stack spacing no longer depends on the OS version, and the pre-iOS 26 path is unchanged. Assisted-by: Claude:claude-fable-5-1
From iOS 26 the arrow edge passed to popoverTip is only a preference. When the VM toolbar spans most of the screen width, the system attaches the "Tap to hide/show toolbar" tip beside the chevron instead of below it, covering the other toolbar buttons until the tip is dismissed. This happened on iPhone on iOS 26.1 and on iPhone and iPad on iOS 27. On iOS 26 and later, restrict the tip's arrow to the edge facing the toolbar, using the top edge when the toolbar is docked at the top and the bottom edge when it is docked at the bottom, so the tip always opens toward the middle of the screen. iOS 17 through 25 keep the existing behavior. Assisted-by: Claude:claude-opus-5
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Rebuilding UTM with Xcode 27 and the iOS 27 SDK broke two parts of the VM window on iOS.
VM toolbar. On iOS 27,
.buttonStyle(.glass)with a circle border shape sizes each button from its label, so the buttons ended up uneven and packed together. On iOS 26.1 the glass adapts to the black VM display behind it and turns almost black, leaving only a faint outline. The toolbar now uses a custom style that draws each icon in the same fixed frame as the pre-iOS 26 style, with interactive glass tinted neutral gray and white icons. It reads the same over dark and light guest content on both versions. The pre-iOS 26 style is unchanged.External display. Apps built with the iOS 27 SDK are no longer offered external display scenes from the Info.plist scene manifest, so the external display stayed black on iOS 27. On iOS 27 the external display content is now registered as a SwiftUI scene accessory. iOS 26 and earlier keep using the Info.plist configuration and the existing scene delegate.
Testing: Tested by a human on the iOS 27, iOS 26.1, iOS 17 and visionOS 27 simulators. The toolbar was confirmed broken before the change and working after it. The external display was confirmed working on iOS 27 and still working on iOS 26. iOS 17 and visionOS 27 were checked as controls and are unchanged.
The author acknowledges that this change has been tested and/or reviewed by a human in accordance with UTM's AI contribution guidelines.
🤖 Generated with Claude Code