iOS icon generation fails with custom xcodeproj path when using flavors

[jierlausson]

Description

When using flavor-specific launcher icons with a custom xcodeproj_path, the tool fails to update the project file despite following the documented flavor configuration pattern (flutter_launcher_icons-<flavor>.yaml).

Steps to Reproduce

1. Create a Flutter project with flavors (dev, hml, prod) and custom iOS project name
2. Create flavor-specific icon configuration files following the documentation pattern:

Example flutter_launcher_icons-hml.yaml:

flutter_launcher_icons:
  android: true
  ios: true
  image_path: "assets/icons/ic_launcher_hml.png"
  remove_alpha_ios: true
  xcodeproj_path: "ios/MyApp.xcodeproj"

3. Run the flavor-specific command:

flutter pub get
dart run flutter_launcher_icons -f flutter_launcher_icons-hml.yaml

Current Behavior

The tool:

1. Successfully generates the flavor-specific icons in Assets.xcassets
2. Fails with path error, still looking for default Runner.xcodeproj:

✓ Successfully generated launcher icons
Unhandled exception:
PathNotFoundException: Cannot open file, path = 'ios/Runner.xcodeproj/project.pbxproj' (OS Error: No such file or directory, errno = 2)

Expected Behavior

The tool should:

1. Generate the flavor-specific icons (currently working)
2. Use the specified xcodeproj_path for project file updates
3. Successfully complete the flavor-specific icon update process

Environment

• Flutter version: 3.19.0
• flutter_launcher_icons version: 0.14.3
• Operating System: macOS Sonoma 14.3.1

Additional Context

• The documentation explicitly supports flavors through flutter_launcher_icons-<flavor>.yaml files
• Icon generation works correctly for flavors
• The issue appears specific to project file updates when using both flavors and custom xcodeproj paths
• Project structure follows Flutter flavor best practices with separate configurations for dev, hml, and prod environments

Related Documentation

From the official documentation:

Create a Flutter Launcher Icons configuration file for your flavor. The config file is called flutter_launcher_icons-.yaml by replacing by the name of your desired flavor.

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