google_maps_flutter_ios_sdk9

Converts remaining code to Swift:

• Converts the protocols defined for testability to Swift
  • Where possible, replaces manual passthrough classes with extensions that add protocol conformance to the actual class, reducing the amount of untestable code we need.
• Switches Pigeon generation to Swift (which causes a lot of mechanical changes due to classes no longer having a prefix, and the constructors being standard Swift construction instead of bridging to Obj-C convenience constructors)
• Uses Pigeon's Swift generator support for subclassing to replace the somewhat hacky nested classes in the interface definition with the actual subclassing that we wanted to express, simplifying some code and adding more type safety.
• Scrubs NSObject conformance from cases where it's no longer necessary. (Class that implement Flutter plugin API protocols still need it, as those are Obj-C protocols.)

Unlike the other PRs, this does not contain any Gemini Obj-C -> Swift conversions (other than some simple protocols); this is mostly just a Pigeon generation change and a lot of mostly mechanical cleanup.

Fixes flutter/flutter#119108

Pre-Review Checklist

This converts HeatmapController and the remaining utility functions to Swift in the _sdk* packages.

The final remaining Obj-C code will be migrated in a follow-up PRs.

The conversion process was:

• Initial conversion via Gemini, with explicit instruction to keep the structure the same.
• Side-by-side manual review of the old and new versions of the files.
• Manual fixes and improvements.

The conversion code utils have much more change than previous PRs, since the direct conversion code felt very non-idiomatic in Swift. Almost all of the free functions for Pigeon<->Maps SDK type conversions were converted to extensions on the Pigeon types:

• To avoid the fragile pattern of putting extension methods on types we don't control (which can lead to collisions), all the extensions are on the Pigeon types, and so the APIs aren't symmetrical:
  • Maps -> Pigeon is done via a convenience constructor (generally called make(from:)
  • Pigeon -> Maps is done via a toMapsSDKClassName() method on the Pigeon type (I'm not sold on that naming pattern; alternate suggestions welcome)
• Conversions functions that were array-based have been changed to single-element conversions following the pattern above, and then the call sites changed to just map that conversion function, since map is a simple and idiomatic pattern in Swift, unlike the loop-and-add construction that had been required in Obj-C.
  • This in turn caused some tests to be simplified, since we didn't need to test things like the number of list items converted, and can instead just test the individual conversion.

The test bridging header is removed since there are no longer any _Test headers.

Part of flutter/flutter#119108

Pre-Review Checklist

This converts MarkerController and ClusterManagersController to Swift in the _sdk* packages.

The remaining Obj-C code will be migrated in a series of follow-up PRs to keep the scope of each PR reasonable for review.

The conversion process was:

• Initial conversion via Gemini, with explicit instruction to keep the structure the same.
• Side-by-side manual review of the old and new versions of the files.
• Manual fixes and improvements.

Part of flutter/flutter#119108

Pre-Review Checklist

• Updates pigeon dev_dependency to ^27.3.2 for analyzer 14 compatibility.

• Converts overlay controllers to Swift.

[google_maps_flutter] Convert simple object controllers to Swift (#12…

[google_maps_flutter] Convert top-level classes to Swift in _sdk* p…

• Fixes a potential compilation issue in tile downscaling.

• Corrects the README header.

• Updates README to include setup information.

• Adds attribution ID for Google Maps SDK usage.

• Removes the requirement to use static builds with Swift Package Manager.

• Adds support for advanced markers.

• Adds UIScene compatibility.

• Standardizes Objective-C class names.

• Initial release, based on 2.17.3 of google_maps_flutter_ios.