flutterFrameworkPathExists function

bool flutterFrameworkPathExists(String packageSwiftPath)

Returns true when the FlutterFramework path declared in packageSwiftPath resolves to an existing directory on disk.

Flutter 3.22+ places the FlutterFramework SPM package in the example app's ephemeral directory. The plugin Package.swift references it via a relative path (../FlutterFramework). This path is resolved at build time by the Flutter toolchain, but is not resolvable when opening the plugin project directly in Xcode without a prior flutter pub get in the example app.

Implementation

bool flutterFrameworkPathExists(String packageSwiftPath) {
  final file = File(packageSwiftPath);
  if (!file.existsSync()) return false;
  final content = file.readAsStringSync();

  // Extract the path string from: .package(name: "FlutterFramework", path: "...")
  final match = RegExp(
    r'\.package\s*\(\s*name\s*:\s*"FlutterFramework"\s*,\s*path\s*:\s*"([^"]+)"\s*\)',
  ).firstMatch(content);
  if (match == null) return false;

  final relativePath = match.group(1)!;
  final packageDir = File(packageSwiftPath).parent.path;
  final resolved = p.normalize(p.join(packageDir, relativePath));
  return Directory(resolved).existsSync();
}