[Feature] Add Swift Package Manager (SPM) support for iOS

[alihassan143]

Original Content

Flutter 3.44 now by default support SPM kindly add swift package manager support

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Description

Flutter 3.44 now defaults to Swift Package Manager (SPM) for iOS dependency management. The flutter_inapp_purchase plugin currently lacks SPM support, which may cause integration issues or warnings for projects using Flutter 3.44+.

Use Case

• Flutter 3.44 enables SPM by default, meaning new and existing projects will attempt to resolve iOS dependencies via SPM.
• Without SPM support in flutter_inapp_purchase, developers may encounter build failures, compatibility warnings, or be forced to opt out of SPM entirely.

References

• Flutter SPM support announcement / migration guide

Proposed Solution

Add a Package.swift manifest to the plugin's iOS directory to support Swift Package Manager, following the Flutter SPM plugin authoring guide.

Additional Context

• Flutter version: 3.44+
• Platform: iOS
• This is a common requirement now being requested across many Flutter plugins as SPM becomes the default.

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🤖 Formatted by gitdog.dev

[gitdogbot]

@alihassan143 Good news — libraries/flutter_inapp_purchase/Package.swift already exists in the codebase. However, it has a known issue that would prevent Flutter's SPM integration from working correctly.

The current Package.swift (at libraries/flutter_inapp_purchase/Package.swift) references a local ios/Classes path and includes cSettings with header search paths pointing to ../Flutter and ../../../Flutter/Export. These paths are specific to CocoaPods layout and won't resolve correctly under Flutter's SPM integration, which expects a different directory structure.

Additionally, the current manifest targets the raw Swift source files directly rather than wrapping the plugin via the FlutterPluginRegistrant mechanism that Flutter's SPM tooling expects.

For full Flutter 3.44 SPM support, the Package.swift needs to be updated to:

1. Declare the correct Flutter framework dependency (Flutter provides SPM-compatible framework artifacts starting in 3.44)
2. Ensure the publicHeadersPath and cSettings header paths align with Flutter's SPM directory layout
3. Verify the minimum iOS platform version matches what the plugin requires (currently set to iOS 12.0, but the Swift implementation uses @available(iOS 15.0, ...) — these should be reconciled)

This is a valid and actionable feature request. A maintainer would need to update libraries/flutter_inapp_purchase/Package.swift to align with Flutter 3.44's SPM integration requirements. You can track Flutter's official SPM plugin guidance at https://docs.flutter.dev/packages-and-plugins/swift-package-manager/for-plugin-authors for the exact manifest shape required.

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[alihassan143]

Completed in #161