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run-ios on Xcode 27: DeviceHub opens no window when the simulator is shut down #2866
Description
Environment
- macOS 26.6.2 (25G83)
- Xcode 27.0 (27A266a), iOS 27.0 simulator runtime (24A434)
@react-native-community/cli20.2.0;runOnSimulatoris unchanged onmain(21.0.0-alpha.1)react-native0.87.1- Node 22.22.3
Description
When the target simulator is shut down, run-ios builds, installs and launches the app, but DeviceHub never shows the simulator's window. The simulator runs headless, and DeviceHub keeps showing whatever device window was already open, if any. When the simulator is already booted, its window opens as expected.
runOnSimulator opens devices://device/open?id=<udid> and then runs xcrun simctl boot. DeviceHub opens a window for a device that is already booted, and also for one that stays shut down, but not for a device that starts booting right after the deep link is opened. Booting first and opening the deep link afterwards shows the window.
Reproducible Demo
With a shut-down simulator that has no DeviceHub window open:
UDID=<shut-down simulator UDID>
# What run-ios does today: the simulator boots, no window opens
open "devices://device/open?id=$UDID"; xcrun simctl boot "$UDID"
xcrun simctl shutdown "$UDID"
# Boot first, then open: the window opens
xcrun simctl boot "$UDID"; open "devices://device/open?id=$UDID"In any React Native app, npx react-native run-ios --udid <shut-down simulator UDID> launches the app on a headless simulator.
Activity
emartinez-nex commentedon Oct 5, 2026
Hi! This issue has already been addressed in #2806 (feat: Support DeviceHub for Xcode 27+) and released in v20.2.0.
Upgrading
@react-native-community/cli(and its platform packages) to20.2.0fixes the simulator launching issue on Xcode 27+.rakodev commentedon Oct 6, 2026
Thanks for taking a look! This one is still there in 20.2.0, which is the version in the report above. It's a follow-up to #2806 rather than something #2806 fixes: #2806 fixed the
Simulator.app does not existcrash on Xcode 27 by opening DeviceHub through thedevices://device/open?id=<udid>deep link, but for a shut-down simulator it opens that link beforesimctl boot(runOnSimulator.ts#L60-L67), and DeviceHub then shows no window. The file hasn't changed onmainsince #2806.So on 20.2.0,
npx react-native run-ios --udid <shut-down simulator UDID>builds, installs and launches the app on a headless simulator. #2867 boots first and opens the deep link afterwards.