Prevent potential crash when accessing window in FlutterSceneDelegate #174873
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| self.window = [[UIWindow alloc] initWithWindowScene:windowScene]; | ||
| self.window.rootViewController = appDelegate.window.rootViewController; | ||
| appDelegate.window = self.window; | ||
| [self.window makeKeyAndVisible]; |
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Moved this logic to a function so it could be mocked
gaaclarke
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engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterSceneDelegateTest.m
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autosubmit label was removed for flutter/flutter/174873, because - The status or check suite Linux mac_clang_tidy has failed. Please fix the issues identified (or deflake) before re-applying this label. |
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Sep 3, 2025
| options:(UISceneConnectionOptions*)connectionOptions { | ||
| NSObject<UIApplicationDelegate>* appDelegate = FlutterSharedApplication.application.delegate; | ||
| if (appDelegate.window.rootViewController) { | ||
| if ([appDelegate respondsToSelector:@selector(window)] && appDelegate.window.rootViewController) { |
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are you able to repro the crash? UIApplicationDelegate does have this window property (it could be nil but shouldn't crash).
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Yes I am able to reproduce this crash. When following this guide, if window isn't explicitly added, it'll crash
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Thanks for confirming!
Very interesting: https://developer.apple.com/documentation/uikit/uiapplicationdelegate/window?language=objc
If you want to provide a custom window for your app, you must implement the getter method of this property and use it to create and return your custom window.
Sounds like we should have added this window property in our guide. Though with SceneDelegate API, all window/vc related logic should be moved.
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Sounds like we should have added this window property in our guide.
Just to clarify, it is in the guide that window property should be used. I just missed it, which is how I discovered the crash
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Roll Flutter from 6b18740d5a23 to 87d5b753196c (88 revisions) flutter/flutter@6b18740...87d5b75 2025-09-05 [email protected] [ Device Lab ] Add regression testing for flutter/flutter#174952 (flutter/flutter#174956) 2025-09-05 [email protected] Roll Skia from 0ca53adfc6cc to 845ec125e94c (2 revisions) (flutter/flutter#174978) 2025-09-05 [email protected] [a11y-app] Fix NavigationRail leading and trailing labels (flutter/flutter#174861) 2025-09-05 [email protected] Roll Skia from d7e99be07d5d to 0ca53adfc6cc (5 revisions) (flutter/flutter#174972) 2025-09-05 [email protected] Roll Fuchsia Linux SDK from izfNA3o_2zL4Cjqmy... to xG_uERsxHvUwFHpF2... (flutter/flutter#174970) 2025-09-04 [email protected] Fix IconButton.color overrided by IconButtomTheme (flutter/flutter#174515) 2025-09-04 [email protected] [web] Reuse chrome instance to run all flutter tests (flutter/flutter#174957) 2025-09-04 [email protected] fix(Semantics): Ensure semantics properties take priority over button's (flutter/flutter#174473) 2025-09-04 [email protected] Make every LLDB Init error message actionable (flutter/flutter#174726) 2025-09-04 [email protected] Fix table cell semantics rect alignment issues. (flutter/flutter#174914) 2025-09-04 [email protected] Fix: Use route navigator for CupertinoSheetRoute pop (flutter/flutter#173103) 2025-09-04 [email protected] [ Widget Preview] Add `group` property to `Preview` (flutter/flutter#174849) 2025-09-04 [email protected] Allow OverlayPortal.overlayChildLayoutBuilder to choose root Overlay (flutter/flutter#174239) 2025-09-04 [email protected] Roll Skia from 7c2f502e3304 to d7e99be07d5d (18 revisions) (flutter/flutter#174936) 2025-09-04 [email protected] Remove 'terms of use' wording from web_unicode (flutter/flutter#174939) 2025-09-04 [email protected] [ Tool ] Remove leftover Android x86 deprecation warning constant (flutter/flutter#174941) 2025-09-04 [email protected] Prevent potential crash when accessing window in FlutterSceneDelegate (flutter/flutter#174873) 2025-09-04 [email protected] Roll Packages from 42bb347 to 98580c6 (5 revisions) (flutter/flutter#174943) 2025-09-04 [email protected] [ Device Lab ] Fix wakefulness check to only match log entries with string values (flutter/flutter#174953) 2025-09-04 [email protected] Fix expanded DropdownMenu panel is shorter than text field (flutter/flutter#174443) 2025-09-04 [email protected] Add a `viewController` property to the ios/macOS `FlutterPluginRegistrar` protocol (flutter/flutter#174168) 2025-09-03 [email protected] Roll Fuchsia Linux SDK from J3T_wZqL_57mRfWky... to izfNA3o_2zL4Cjqmy... (flutter/flutter#174908) 2025-09-03 [email protected] Wires up Android API to set section locale (flutter/flutter#173364) 2025-09-03 [email protected] Delete impeller::SPrintF. (flutter/flutter#174900) 2025-09-03 [email protected] Make sure that a DropdownMenuFormField doesn't crash in 0x0 environment (flutter/flutter#174777) 2025-09-03 [email protected] Remove unnecessary `presubmit_max_attempts` from .ci.yaml (flutter/flutter#174885) 2025-09-03 [email protected] Use local canvaskit in `dart_data_asset_test.dart` (flutter/flutter#174891) 2025-09-03 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Mark Linux web_canvaskit_tests_7_last as bringup (#174878)" (flutter/flutter#174897) 2025-09-03 [email protected] Correct intrinsics calculation for CupertinoTextField with placeholder (flutter/flutter#174889) 2025-09-03 [email protected] Considers large title height in CupertinoNavigationBar's preferred size (flutter/flutter#173722) 2025-09-03 [email protected] [A11y] Add semantics for CupertinoExpansionTile (flutter/flutter#174480) 2025-09-03 [email protected] Fix LinearProgressIndicator track painting. (flutter/flutter#173108) 2025-09-03 [email protected] update triage documentation to include team-android (flutter/flutter#174850) 2025-09-03 [email protected] Update `test_timeout_secs` to match `timeout` for `Linux web_skwasm_tests_*` and `Linux web_canvaskit_tests_*` (flutter/flutter#174881) 2025-09-03 [email protected] Roll Packages from 5d785a0 to 42bb347 (10 revisions) (flutter/flutter#174876) 2025-09-03 [email protected] Fixup formatting of gn files in the old buildroot. (flutter/flutter#174852) 2025-09-03 [email protected] Roll Dart SDK to 3.10.0-162.1.beta (flutter/flutter#174834) 2025-09-03 [email protected] Mark Linux web_canvaskit_tests_7_last as bringup (flutter/flutter#174878) 2025-09-02 [email protected] [Impeller] Fix overdraw in DrawRect geometry (flutter/flutter#174735) 2025-09-02 [email protected] Patch .clang-format files to specify C++20. (flutter/flutter#174848) 2025-09-02 [email protected] Add data assets (flutter/flutter#174685) 2025-09-02 [email protected] refactors `FlutterPlugin.kt` to use one line statement in the `into` bloc (flutter/flutter#174759) 2025-09-02 [email protected] Ensures initial semantics state is sent to engine (flutter/flutter#174845) 2025-09-02 [email protected] [Android] Break up plugin_test integration tests (flutter/flutter#174728) 2025-09-02 [email protected] Fix: Assertion failure in RawScrollbarState with dynamic controller assignment (flutter/flutter#173156) 2025-09-02 [email protected] Roll Skia from 359f3d7cc7ed to 7c2f502e3304 (1 revision) (flutter/flutter#174844) ...
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…flutter#174873) Accessing `appDelegate.window` may crash if the AppDelegate doesn't have the window property. This can happen when using a custom `UIApplicationDelegate` (and not the `FlutterAppDelegate`). ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
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…flutter#174873) Accessing `appDelegate.window` may crash if the AppDelegate doesn't have the window property. This can happen when using a custom `UIApplicationDelegate` (and not the `FlutterAppDelegate`). ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
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…r#9962) Roll Flutter from 6b18740d5a23 to 87d5b753196c (88 revisions) flutter/flutter@6b18740...87d5b75 2025-09-05 [email protected] [ Device Lab ] Add regression testing for flutter/flutter#174952 (flutter/flutter#174956) 2025-09-05 [email protected] Roll Skia from 0ca53adfc6cc to 845ec125e94c (2 revisions) (flutter/flutter#174978) 2025-09-05 [email protected] [a11y-app] Fix NavigationRail leading and trailing labels (flutter/flutter#174861) 2025-09-05 [email protected] Roll Skia from d7e99be07d5d to 0ca53adfc6cc (5 revisions) (flutter/flutter#174972) 2025-09-05 [email protected] Roll Fuchsia Linux SDK from izfNA3o_2zL4Cjqmy... to xG_uERsxHvUwFHpF2... (flutter/flutter#174970) 2025-09-04 [email protected] Fix IconButton.color overrided by IconButtomTheme (flutter/flutter#174515) 2025-09-04 [email protected] [web] Reuse chrome instance to run all flutter tests (flutter/flutter#174957) 2025-09-04 [email protected] fix(Semantics): Ensure semantics properties take priority over button's (flutter/flutter#174473) 2025-09-04 [email protected] Make every LLDB Init error message actionable (flutter/flutter#174726) 2025-09-04 [email protected] Fix table cell semantics rect alignment issues. (flutter/flutter#174914) 2025-09-04 [email protected] Fix: Use route navigator for CupertinoSheetRoute pop (flutter/flutter#173103) 2025-09-04 [email protected] [ Widget Preview] Add `group` property to `Preview` (flutter/flutter#174849) 2025-09-04 [email protected] Allow OverlayPortal.overlayChildLayoutBuilder to choose root Overlay (flutter/flutter#174239) 2025-09-04 [email protected] Roll Skia from 7c2f502e3304 to d7e99be07d5d (18 revisions) (flutter/flutter#174936) 2025-09-04 [email protected] Remove 'terms of use' wording from web_unicode (flutter/flutter#174939) 2025-09-04 [email protected] [ Tool ] Remove leftover Android x86 deprecation warning constant (flutter/flutter#174941) 2025-09-04 [email protected] Prevent potential crash when accessing window in FlutterSceneDelegate (flutter/flutter#174873) 2025-09-04 [email protected] Roll Packages from 42bb347 to 98580c6 (5 revisions) (flutter/flutter#174943) 2025-09-04 [email protected] [ Device Lab ] Fix wakefulness check to only match log entries with string values (flutter/flutter#174953) 2025-09-04 [email protected] Fix expanded DropdownMenu panel is shorter than text field (flutter/flutter#174443) 2025-09-04 [email protected] Add a `viewController` property to the ios/macOS `FlutterPluginRegistrar` protocol (flutter/flutter#174168) 2025-09-03 [email protected] Roll Fuchsia Linux SDK from J3T_wZqL_57mRfWky... to izfNA3o_2zL4Cjqmy... (flutter/flutter#174908) 2025-09-03 [email protected] Wires up Android API to set section locale (flutter/flutter#173364) 2025-09-03 [email protected] Delete impeller::SPrintF. (flutter/flutter#174900) 2025-09-03 [email protected] Make sure that a DropdownMenuFormField doesn't crash in 0x0 environment (flutter/flutter#174777) 2025-09-03 [email protected] Remove unnecessary `presubmit_max_attempts` from .ci.yaml (flutter/flutter#174885) 2025-09-03 [email protected] Use local canvaskit in `dart_data_asset_test.dart` (flutter/flutter#174891) 2025-09-03 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Mark Linux web_canvaskit_tests_7_last as bringup (#174878)" (flutter/flutter#174897) 2025-09-03 [email protected] Correct intrinsics calculation for CupertinoTextField with placeholder (flutter/flutter#174889) 2025-09-03 [email protected] Considers large title height in CupertinoNavigationBar's preferred size (flutter/flutter#173722) 2025-09-03 [email protected] [A11y] Add semantics for CupertinoExpansionTile (flutter/flutter#174480) 2025-09-03 [email protected] Fix LinearProgressIndicator track painting. (flutter/flutter#173108) 2025-09-03 [email protected] update triage documentation to include team-android (flutter/flutter#174850) 2025-09-03 [email protected] Update `test_timeout_secs` to match `timeout` for `Linux web_skwasm_tests_*` and `Linux web_canvaskit_tests_*` (flutter/flutter#174881) 2025-09-03 [email protected] Roll Packages from 5d785a0 to 42bb347 (10 revisions) (flutter/flutter#174876) 2025-09-03 [email protected] Fixup formatting of gn files in the old buildroot. (flutter/flutter#174852) 2025-09-03 [email protected] Roll Dart SDK to 3.10.0-162.1.beta (flutter/flutter#174834) 2025-09-03 [email protected] Mark Linux web_canvaskit_tests_7_last as bringup (flutter/flutter#174878) 2025-09-02 [email protected] [Impeller] Fix overdraw in DrawRect geometry (flutter/flutter#174735) 2025-09-02 [email protected] Patch .clang-format files to specify C++20. (flutter/flutter#174848) 2025-09-02 [email protected] Add data assets (flutter/flutter#174685) 2025-09-02 [email protected] refactors `FlutterPlugin.kt` to use one line statement in the `into` bloc (flutter/flutter#174759) 2025-09-02 [email protected] Ensures initial semantics state is sent to engine (flutter/flutter#174845) 2025-09-02 [email protected] [Android] Break up plugin_test integration tests (flutter/flutter#174728) 2025-09-02 [email protected] Fix: Assertion failure in RawScrollbarState with dynamic controller assignment (flutter/flutter#173156) 2025-09-02 [email protected] Roll Skia from 359f3d7cc7ed to 7c2f502e3304 (1 revision) (flutter/flutter#174844) ...
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…flutter#174873) Accessing `appDelegate.window` may crash if the AppDelegate doesn't have the window property. This can happen when using a custom `UIApplicationDelegate` (and not the `FlutterAppDelegate`). ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
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Accessing
appDelegate.windowmay crash if the AppDelegate doesn't have the window property. This can happen when using a customUIApplicationDelegate(and not theFlutterAppDelegate).Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the
gemini-code-assistbot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.