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Provide guided migration logs when iOS app crashes on simulator#188736

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okorohelijah:fix-uiscene-simulator-crash
Jun 30, 2026
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Provide guided migration logs when iOS app crashes on simulator#188736
auto-submit[bot] merged 3 commits into
flutter:masterfrom
okorohelijah:fix-uiscene-simulator-crash

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@okorohelijah okorohelijah commented Jun 29, 2026

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When an unmigrated iOS app runs on iOS 27+, it immediately crashes on launch because the UIScene lifecycle is required.

Part II of #188556

List which issues are fixed by this PR. You must list at least one issue. An issue is not required if the PR fixes something trivial like a typo.

Fixes #187758

If you had to change anything in the flutter/tests repo, include a link to the migration guide as per the breaking change policy.

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@okorohelijah
okorohelijah requested a review from a team as a code owner June 29, 2026 18:10
@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Jun 29, 2026
@github-actions github-actions Bot added platform-ios iOS applications specifically tool Affects the "flutter" command-line tool. See also t: labels. team-ios Owned by iOS platform team labels Jun 29, 2026
@okorohelijah okorohelijah changed the title [flutter_tools] Fix UIScene lifecycle warning detection on older iOS simulators Provide guided migration logs when iOS app crashes on simulator Jun 29, 2026

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Code Review

This pull request removes the UIScene warning interceptor from iOS devices and introduces a crash interceptor in the iOS simulator log reader to throw a ToolExit when a UIScene lifecycle error is detected. It also updates the unified logging predicate and adds a test case to verify this behavior. The review feedback suggests expanding the crash interceptor's regex pattern to match additional warning strings, ensuring the migration instructions are consistently triggered.

Comment thread packages/flutter_tools/lib/src/ios/simulators.dart
@okorohelijah
okorohelijah marked this pull request as draft June 29, 2026 18:13
@okorohelijah
okorohelijah marked this pull request as ready for review June 29, 2026 19:42

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Code Review

This pull request updates the iOS simulator log reader to detect UIScene lifecycle crash logs and throw a migration error, with corresponding updates and a new test in the simulator tests. Feedback recommends adding a documentation comment to the public error constant kUISceneMigrationRequiredError to comply with the style guide, and expanding the system log predicate to also match 'UIScene lifecycle is required' without a space to align with the regular expression.

'senderImagePath ENDSWITH "/Flutter"',
'senderImagePath ENDSWITH "/libswiftCore.dylib"',
'processImageUUID == senderImageUUID',
'eventMessage CONTAINS "UIScene life cycle is required"',

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medium

Since the regular expression r'UIScene life\s?cycle is required' matches both 'UIScene life cycle is required' (with a space) and 'UIScene lifecycle is required' (without a space), we should also include the version without a space in the system log predicate. Otherwise, if the OS logs 'UIScene lifecycle is required', it will be filtered out by the system log tool and the migration error will not be triggered.

Note: If you apply this change, you will also need to update the corresponding test expectations in packages/flutter_tools/test/general.shard/ios/simulators_test.dart.

Suggested change
'eventMessage CONTAINS "UIScene life cycle is required"',
'eventMessage CONTAINS "UIScene life cycle is required"',
'eventMessage CONTAINS "UIScene lifecycle is required"',

Comment thread packages/flutter_tools/lib/src/ios/devices.dart
@okorohelijah okorohelijah added CICD Run CI/CD and removed CICD Run CI/CD labels Jun 29, 2026

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LGTM

auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jul 7, 2026
…#12081)

Manual roll Flutter from 0c80830e465b to ca9f874f5284 (119 revisions)

Manual roll requested by [email protected]

flutter/flutter@0c80830...ca9f874

2026-06-30 [email protected] [tool] Don't require a Flutter compile task when staging jniLibs (flutter/flutter#188805)
2026-06-30 [email protected] [Impeller] Fix potential overflow when allocating buffers at the next power of two size (flutter/flutter#188742)
2026-06-30 [email protected] [Framework/Tool] Decouple preview theme imports (flutter/flutter#188176)
2026-06-30 [email protected] Add import of `dart:_js_interop_wasm` in sdk rewriter tool (flutter/flutter#188620)
2026-06-30 [email protected] Detach LLDB and print stack trace on process stop (flutter/flutter#188576)
2026-06-30 [email protected] [Linux] Fix FlCompositorOpenGL.pixels comment (flutter/flutter#188754)
2026-06-30 [email protected] [flutter_tools] Fix crash in flutter create when pubspec.yaml is empty (flutter/flutter#188385)
2026-06-30 [email protected] Roll Packages from 656ccaa to 274ed3e (23 revisions) (flutter/flutter#188792)
2026-06-30 [email protected] In AndroidImageGenerator, check that the destination pixel buffer has sufficient capacity for the decoded data (flutter/flutter#188752)
2026-06-30 [email protected] Roll pub packages (flutter/flutter#188773)
2026-06-30 [email protected] [Impeller] Add a flat VertexAttributeFormat for vertex inputs (flutter/flutter#188684)
2026-06-30 [email protected] Roll pub packages (flutter/flutter#188764)
2026-06-30 [email protected] Roll Dart SDK from 0cb483880b6b to e1bdb9ce3327 (2 revisions) (flutter/flutter#188763)
2026-06-29 [email protected] Handle 'no permissions' adb device state (flutter/flutter#187248)
2026-06-29 [email protected] [windows]: adjusts uniform buffers to hit hlsl optimization (flutter/flutter#188538)
2026-06-29 [email protected] Roll Skia from bfb7860cb9c7 to 71947c4110b0 (9 revisions) (flutter/flutter#188747)
2026-06-29 [email protected] ci: extract wait-for-engine-build logic into a reusable composite action (flutter/flutter#188748)
2026-06-29 [email protected] Provide guided migration logs when iOS app crashes on simulator (flutter/flutter#188736)
2026-06-29 [email protected] Revert "[flutter_tools] Track asset transformer dependencies for hot reload" (flutter/flutter#188751)
2026-06-29 [email protected] Migrate ABI splits to new AGP dsl (flutter/flutter#188369)
2026-06-29 [email protected] Add Impeller+OpenGLES startup benchmark for mokey (flutter/flutter#188495)
2026-06-29 [email protected] Increase macOS minimum supported version from 10.15 to 12 to support Xcode 27  (flutter/flutter#188520)
2026-06-29 [email protected] Moves test ownership validation to flutter/flutter (flutter/flutter#188655)
2026-06-29 [email protected] Add --flavor support for Windows desktop builds (flutter/flutter#187034)
2026-06-29 [email protected] Android_hardware_smoke_test: Enable pixel exact local file comparator to read goldens from flutter asset URI (flutter/flutter#188587)
2026-06-29 [email protected] [flutter_tools] Use DeviceHub.app for iOS simulator path on Xcode 27+ (flutter/flutter#187910)
2026-06-29 [email protected] Roll Skia from 111e7582d081 to bfb7860cb9c7 (2 revisions) (flutter/flutter#188731)
2026-06-29 [email protected] Use `revert` label instead of `revert_wf` (flutter/flutter#188639)
2026-06-29 [email protected] Properly await Dart Development Service shutdown with timeout (flutter/flutter#188387)
2026-06-29 [email protected] [flutter_tools] Track asset transformer dependencies for hot reload (flutter/flutter#187947)
2026-06-29 [email protected] [Tool] Tolerate malformed UTF-8 in process streaming decoders (flutter/flutter#188453)
2026-06-29 [email protected] [flutter_tools] Use new ddc modules in test (flutter/flutter#188240)
2026-06-29 [email protected] Roll Packages from c1f7d92 to 656ccaa (12 revisions) (flutter/flutter#188728)
2026-06-29 [email protected] Remove unused fields (flutter/flutter#188705)
2026-06-29 [email protected] Clear text input handler widget on view dispose (flutter/flutter#188701)
2026-06-29 [email protected] Free compositor in view renderer finalize to avoid use-after-free (flutter/flutter#188702)
2026-06-29 [email protected] [linux] Use GWeakRef in mock signal handler test helper (flutter/flutter#188700)
2026-06-29 [email protected] Fixing few related editing issues with LTR/RTL text (flutter/flutter#188503)
2026-06-29 [email protected] [Flutter GPU] Add Texture.fromImage to wrap a ui.Image texture (flutter/flutter#188605)
2026-06-29 [email protected] [Flutter GPU] Honor the enable argument in RenderPass.setDepthWriteEnable (flutter/flutter#188715)
2026-06-29 [email protected] Roll Skia from ba1942d8c3e1 to 111e7582d081 (1 revision) (flutter/flutter#188721)
2026-06-29 [email protected] Roll Skia from 587d8befe1ee to ba1942d8c3e1 (6 revisions) (flutter/flutter#188717)
2026-06-29 [email protected] Remove some refs to package:intl (flutter/flutter#188504)
2026-06-29 [email protected] [VPAT] Update a11y assessment app FAB example to announce value change when it's updated. (flutter/flutter#188466)
...
kalyujniy pushed a commit to brickit-app/camera that referenced this pull request Jul 8, 2026
…flutter#12081)

Manual roll Flutter from 0c80830e465b to ca9f874f5284 (119 revisions)

Manual roll requested by [email protected]

flutter/flutter@0c80830...ca9f874

2026-06-30 [email protected] [tool] Don't require a Flutter compile task when staging jniLibs (flutter/flutter#188805)
2026-06-30 [email protected] [Impeller] Fix potential overflow when allocating buffers at the next power of two size (flutter/flutter#188742)
2026-06-30 [email protected] [Framework/Tool] Decouple preview theme imports (flutter/flutter#188176)
2026-06-30 [email protected] Add import of `dart:_js_interop_wasm` in sdk rewriter tool (flutter/flutter#188620)
2026-06-30 [email protected] Detach LLDB and print stack trace on process stop (flutter/flutter#188576)
2026-06-30 [email protected] [Linux] Fix FlCompositorOpenGL.pixels comment (flutter/flutter#188754)
2026-06-30 [email protected] [flutter_tools] Fix crash in flutter create when pubspec.yaml is empty (flutter/flutter#188385)
2026-06-30 [email protected] Roll Packages from 656ccaa to 274ed3e (23 revisions) (flutter/flutter#188792)
2026-06-30 [email protected] In AndroidImageGenerator, check that the destination pixel buffer has sufficient capacity for the decoded data (flutter/flutter#188752)
2026-06-30 [email protected] Roll pub packages (flutter/flutter#188773)
2026-06-30 [email protected] [Impeller] Add a flat VertexAttributeFormat for vertex inputs (flutter/flutter#188684)
2026-06-30 [email protected] Roll pub packages (flutter/flutter#188764)
2026-06-30 [email protected] Roll Dart SDK from 0cb483880b6b to e1bdb9ce3327 (2 revisions) (flutter/flutter#188763)
2026-06-29 [email protected] Handle 'no permissions' adb device state (flutter/flutter#187248)
2026-06-29 [email protected] [windows]: adjusts uniform buffers to hit hlsl optimization (flutter/flutter#188538)
2026-06-29 [email protected] Roll Skia from bfb7860cb9c7 to 71947c4110b0 (9 revisions) (flutter/flutter#188747)
2026-06-29 [email protected] ci: extract wait-for-engine-build logic into a reusable composite action (flutter/flutter#188748)
2026-06-29 [email protected] Provide guided migration logs when iOS app crashes on simulator (flutter/flutter#188736)
2026-06-29 [email protected] Revert "[flutter_tools] Track asset transformer dependencies for hot reload" (flutter/flutter#188751)
2026-06-29 [email protected] Migrate ABI splits to new AGP dsl (flutter/flutter#188369)
2026-06-29 [email protected] Add Impeller+OpenGLES startup benchmark for mokey (flutter/flutter#188495)
2026-06-29 [email protected] Increase macOS minimum supported version from 10.15 to 12 to support Xcode 27  (flutter/flutter#188520)
2026-06-29 [email protected] Moves test ownership validation to flutter/flutter (flutter/flutter#188655)
2026-06-29 [email protected] Add --flavor support for Windows desktop builds (flutter/flutter#187034)
2026-06-29 [email protected] Android_hardware_smoke_test: Enable pixel exact local file comparator to read goldens from flutter asset URI (flutter/flutter#188587)
2026-06-29 [email protected] [flutter_tools] Use DeviceHub.app for iOS simulator path on Xcode 27+ (flutter/flutter#187910)
2026-06-29 [email protected] Roll Skia from 111e7582d081 to bfb7860cb9c7 (2 revisions) (flutter/flutter#188731)
2026-06-29 [email protected] Use `revert` label instead of `revert_wf` (flutter/flutter#188639)
2026-06-29 [email protected] Properly await Dart Development Service shutdown with timeout (flutter/flutter#188387)
2026-06-29 [email protected] [flutter_tools] Track asset transformer dependencies for hot reload (flutter/flutter#187947)
2026-06-29 [email protected] [Tool] Tolerate malformed UTF-8 in process streaming decoders (flutter/flutter#188453)
2026-06-29 [email protected] [flutter_tools] Use new ddc modules in test (flutter/flutter#188240)
2026-06-29 [email protected] Roll Packages from c1f7d92 to 656ccaa (12 revisions) (flutter/flutter#188728)
2026-06-29 [email protected] Remove unused fields (flutter/flutter#188705)
2026-06-29 [email protected] Clear text input handler widget on view dispose (flutter/flutter#188701)
2026-06-29 [email protected] Free compositor in view renderer finalize to avoid use-after-free (flutter/flutter#188702)
2026-06-29 [email protected] [linux] Use GWeakRef in mock signal handler test helper (flutter/flutter#188700)
2026-06-29 [email protected] Fixing few related editing issues with LTR/RTL text (flutter/flutter#188503)
2026-06-29 [email protected] [Flutter GPU] Add Texture.fromImage to wrap a ui.Image texture (flutter/flutter#188605)
2026-06-29 [email protected] [Flutter GPU] Honor the enable argument in RenderPass.setDepthWriteEnable (flutter/flutter#188715)
2026-06-29 [email protected] Roll Skia from ba1942d8c3e1 to 111e7582d081 (1 revision) (flutter/flutter#188721)
2026-06-29 [email protected] Roll Skia from 587d8befe1ee to ba1942d8c3e1 (6 revisions) (flutter/flutter#188717)
2026-06-29 [email protected] Remove some refs to package:intl (flutter/flutter#188504)
2026-06-29 [email protected] [VPAT] Update a11y assessment app FAB example to announce value change when it's updated. (flutter/flutter#188466)
...
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Provide guided logs when app crashes due to UIScene on iOS 27

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