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iOS: Make FlutterViewController.engine a strong ref #56663

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@cbracken cbracken commented Nov 17, 2024

Previously, FlutterViewController.engine was declared as a weak readonly property, but we explicitly declared the FlutterEngine* _engine ivar as a strong reference in the implementation. This changes the property declaration to be strong and eliminates the now unnecessary ivar.

There is also no semantic change to FlutterViewController itself, since the _engine ivar had been manually declared as a strong reference.

There is no semantic change for users of FlutterViewController.engine since whether a user acquires a strong or weak reference to the engine is determined by whether they declare the pointer to which they assign it as strong or weak.

This also eliminates the need for the engine getter, which was only present to prevent a warning that the strong ivar didn't match the weak property declaration.

No changes to tests since this introduces no semantic changes.

Issue: flutter/flutter#137801

Pre-launch Checklist

  • I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • I read the Tree Hygiene wiki page, which explains my responsibilities.
  • I read and followed the Flutter Style Guide and the C++, Objective-C, Java style guides.
  • I listed at least one issue that this PR fixes in the description above.
  • I added new tests to check the change I am making or feature I am adding, or the PR is test-exempt. See testing the engine for instructions on writing and running engine tests.
  • I updated/added relevant documentation (doc comments with ///).
  • I signed the CLA.
  • All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

Previously, FlutterViewController.engine was declared as a weak readonly
property, but we explicitly declared the `FlutterEngine* _engine` ivar
as a strong reference in the implementation.

This changes the property declaration to be strong and eliminates the
now unnecessary ivar.

There is also no semantic change to FlutterViewController itself, since
the `_engine` ivar had been manually declared as a strong reference.

There is no semantic change for users of FlutterViewController.engine
since whether a user acquires a strong or weak reference to the engine
is determined by whether they declare the pointer to which they assign
it as strong or weak.

This also eliminates the need for the `engine` getter, which was only
present to prevent a warning that the strong ivar didn't match the weak
property declaration.

No changes to tests since this introduces no semantic changes.

Issue: flutter/flutter#137801
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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!).

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

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LGTM

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test-exempt: code refactor with no semantic change

@cbracken cbracken added the autosubmit Merge PR when tree becomes green via auto submit App label Nov 17, 2024
@auto-submit auto-submit bot merged commit 7846bc2 into flutter:main Nov 17, 2024
31 checks passed
@auto-submit auto-submit bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Nov 17, 2024
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Nov 17, 2024
github-merge-queue bot pushed a commit to flutter/flutter that referenced this pull request Nov 18, 2024
…159055)

flutter/engine@4878f1c...d0f0526

2024-11-17 [email protected] iOS,macOS: Fix string constant declarations
(flutter/engine#56661)
2024-11-17 [email protected] iOS: Make FlutterViewController.engine a
strong ref (flutter/engine#56663)
2024-11-17 [email protected] iOS: Clean up uses of string literal
constants (flutter/engine#56658)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC [email protected],[email protected] on the revert to ensure
that a human
is aware of the problem.

To file a bug in Flutter:
https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Nov 18, 2024
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Nov 18, 2024
github-merge-queue bot pushed a commit to flutter/flutter that referenced this pull request Nov 18, 2024
…159057)

flutter/engine@4878f1c...a63841d

2024-11-18 [email protected] iOS: Clean up @synthesize directives / ivars
(flutter/engine#56665)
2024-11-17 [email protected] Roll Skia from 4708534db2e7 to
452208ce96aa (1 revision) (flutter/engine#56664)
2024-11-17 [email protected] iOS: Extract constant for
CADisableMinimumFrameDurationOnPhone (flutter/engine#56659)
2024-11-17 [email protected] iOS: Eliminate unnecessary use of
NSClassFromString (flutter/engine#56660)
2024-11-17 [email protected] iOS: Eliminate unnecessary bridged retain
casts (flutter/engine#56662)
2024-11-17 [email protected] iOS,macOS: Fix string constant declarations
(flutter/engine#56661)
2024-11-17 [email protected] iOS: Make FlutterViewController.engine a
strong ref (flutter/engine#56663)
2024-11-17 [email protected] iOS: Clean up uses of string literal
constants (flutter/engine#56658)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC [email protected],[email protected] on the revert to ensure
that a human
is aware of the problem.

To file a bug in Flutter:
https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
@cbracken cbracken deleted the weak-to-strong branch November 28, 2024 16:33
nick9822 pushed a commit to nick9822/flutter that referenced this pull request Dec 18, 2024
…6663)

Previously, FlutterViewController.engine was declared as a weak readonly property, but we explicitly declared the `FlutterEngine* _engine` ivar as a strong reference in the implementation. This changes the property declaration to be strong and eliminates the now unnecessary ivar.

There is also no semantic change to FlutterViewController itself, since the `_engine` ivar had been manually declared as a strong reference.

There is no semantic change for users of FlutterViewController.engine since whether a user acquires a strong or weak reference to the engine is determined by whether they declare the pointer to which they assign it as strong or weak.

This also eliminates the need for the `engine` getter, which was only present to prevent a warning that the strong ivar didn't match the weak property declaration.

No changes to tests since this introduces no semantic changes.

Issue: flutter#137801

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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