[ffigen] Fix ObjC/Swift examples (#1688)

Author: liamappelbe

pkgs/ffigen/example/objective_c/avf_audio_bindings.dart

@@ -6,10 +6,14 @@ import 'dart:ffi';
 import 'package:objective_c/objective_c.dart';
 import 'avf_audio_bindings.dart';
 
+// TODO(https://github.com/dart-lang/native/issues/1068): Remove this.
+import '../../../objective_c/test/setup.dart' as objCSetup;
+
 const _dylibPath =
     '/System/Library/Frameworks/AVFAudio.framework/Versions/Current/AVFAudio';
 
 void main(List<String> args) async {
+  objCSetup.main([]);
   DynamicLibrary.open(_dylibPath);
   for (final file in args) {
     final fileStr = NSString(file);

pkgs/ffigen/example/objective_c/play_audio.dart

@@ -8,11 +8,13 @@ environment:
   sdk: '>=3.2.0 <4.0.0'
 
 dependencies:
+  args: ^2.6.0
   ffi: ^2.0.1
   objective_c: ^0.0.1
+
 dev_dependencies:
   ffigen:
-    path: '../../'
+    path: ../../
   lints: ^2.0.0
 
 dependency_overrides:

pkgs/ffigen/example/objective_c/pubspec.yaml

@@ -5,7 +5,12 @@
 import 'dart:ffi';
 import 'swift_api_bindings.dart';
 
+// TODO(https://github.com/dart-lang/native/issues/1068): Remove this.
+import '../../../objective_c/test/setup.dart' as objCSetup;
+
 void main() {
+  objCSetup.main([]);
+
   // TODO(https://github.com/dart-lang/ffigen/issues/443): Add a test for this.
   DynamicLibrary.open('libswiftapi.dylib');
   final object = SwiftClass.new1();

pkgs/ffigen/example/swift/example.dart

@@ -8,11 +8,13 @@ environment:
   sdk: ">=3.2.0-42.1.beta <4.0.0"
 
 dependencies:
+  args: ^2.6.0
   ffi: ^2.0.1
   objective_c: ^0.0.1
+
 dev_dependencies:
   ffigen:
-    path: "../../"
+    path: ../../
   lints: ^2.0.0
 
 dependency_overrides: