[CP-stable] Update lifecycle event loops to be mutation-safe#183125
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vashworth wants to merge 2 commits intoflutter:flutter-3.41-candidate.0from
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[CP-stable] Update lifecycle event loops to be mutation-safe#183125vashworth wants to merge 2 commits intoflutter:flutter-3.41-candidate.0from
vashworth wants to merge 2 commits intoflutter:flutter-3.41-candidate.0from
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Fix flutter#182361 ## 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]. - [x] 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 --------- Co-authored-by: zemanux <[email protected]> Co-authored-by: emxpi <[email protected]>
…lutter#183018) flutter#182362 landed, but it did not update `userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:` Part of flutter#182361. ## 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]. - [x] 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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This pull request was opened from and to a release candidate branch. This should only be done as part of the official Flutter release process. If you are attempting to make a regular contribution to the Flutter project, please close this PR and follow the instructions at Tree Hygiene for detailed instructions on contributing to Flutter. Reviewers: Use caution before merging pull requests to release branches. Ensure the proper procedure has been followed. |
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Code Review
This pull request correctly addresses a potential mutation crash in iOS lifecycle event handling by ensuring that delegate enumeration is always performed on a snapshot of the delegate list. The changes are consistent across all relevant methods in FlutterPluginAppLifeCycleDelegate.mm. Additionally, comprehensive tests have been added to validate the fix for both adding and removing delegates during enumeration, which is excellent. I have one suggestion to improve the readability of the new test code.
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| @interface MutatingPlugin : NSObject <FlutterApplicationLifeCycleDelegate> | ||
| @property(nonatomic, weak) FlutterPluginAppLifeCycleDelegate* lifecycleDelegate; | ||
| @property(nonatomic, assign) BOOL shouldAdd; // YES = Add, NO = Remove | ||
| @end |
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For improved readability and to make the test code more self-documenting, consider using an enum to represent the behavior of the MutatingPlugin instead of a BOOL. A boolean property shouldAdd is less descriptive than an enum, especially if more test behaviors were to be added in the future. An enum makes the plugin's purpose more explicit.
You would then update the implementation to use a switch on self.behavior and the test setup to set mutatingPlugin.behavior.
typedef NS_ENUM(NSUInteger, MutatingPluginBehavior) {
MutatingPluginBehaviorAddDelegate,
MutatingPluginBehaviorRemoveSelf,
};
@interface MutatingPlugin : NSObject <FlutterApplicationLifeCycleDelegate>
@property(nonatomic, weak) FlutterPluginAppLifeCycleDelegate* lifecycleDelegate;
@property(nonatomic, assign) MutatingPluginBehavior behavior;
@end
hellohuanlin
approved these changes
Mar 2, 2026
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Issue Link:
What is the link to the issue this cherry-pick is addressing?
#182361
Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)?
Does it impact development (ex. flutter doctor crashes when Android Studio is installed),
or the shipping of production apps (the app crashes on launch).
This information is for domain experts and release engineers to understand the consequences of saying yes or no to the cherry pick.
iOS app may crash when plugin registers for lifecycle events.
Changelog Description:
Explain this cherry pick:
See best practices for examples.
[flutter/182361] When iOS plugins register to receive lifecycle events during an event, a crash may occur.
Workaround:
Is there a workaround for this issue?
No
Risk:
What is the risk level of this cherry-pick?
Test Coverage:
Are you confident that your fix is well-tested by automated tests?
Validation Steps:
What are the steps to validate that this fix works?
N/A. This isn't easily reproducible (likely a race condition)