Fix analysis warnings

permission_handler/example/ios/Flutter/Flutter.podspec

 #
 # NOTE: This podspec is NOT to be published. It is only used as a local source!
+#       This is a generated file; do not edit or check into version control.
 #
 
 Pod::Spec.new do |s|
   s.name             = 'Flutter'
   s.version          = '1.0.0'
   s.summary          = 'High-performance, high-fidelity mobile apps.'
-  s.description      = <<-DESC
-Flutter provides an easy and productive way to build and deploy high-performance mobile apps for Android and iOS.
-                       DESC
   s.homepage         = 'https://flutter.io'
   s.license          = { :type => 'MIT' }
   s.author           = { 'Flutter Dev Team' => 'flutter-dev@googlegroups.com' }
   s.source           = { :git => 'https://github.com/flutter/engine', :tag => s.version.to_s }
   s.ios.deployment_target = '8.0'
-  s.vendored_frameworks = 'Flutter.framework'
+  # Framework linking is handled by Flutter tooling, not CocoaPods.
+  # Add a placeholder to satisfy `s.dependency 'Flutter'` plugin podspecs.
+  s.vendored_frameworks = 'path/to/nothing'
 end

permission_handler/example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -2,6 +2,6 @@
 <Workspace
    version = "1.0">
    <FileRef
-      location = "group:Runner.xcodeproj">
+      location = "self:">
    </FileRef>
 </Workspace>

permission_handler/example/lib/plugin_example/permission_widget.dart

@@ -70,7 +70,7 @@ class _PermissionState extends State<PermissionWidget> {
   }
 
   void checkServiceStatus(BuildContext context, Permission permission) async {
-    Scaffold.of(context).showSnackBar(SnackBar(
+    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
       content: Text((await permission.status).toString()),
     ));
   }

permission_handler/example/lib/template/info_page.dart

@@ -74,11 +74,13 @@ class InfoPage extends StatelessWidget {
       margin: const EdgeInsets.only(top: 24.0),
       alignment: Alignment.center,
       child: SizedBox.expand(
-        child: RaisedButton(
-          textTheme: Theme.of(context).buttonTheme.textTheme,
-          shape:
-              RoundedRectangleBorder(borderRadius: BorderRadius.circular(30.0)),
-          padding: const EdgeInsets.all(8),
+        child: ElevatedButton(
+          style: ElevatedButton.styleFrom(
+            padding: const EdgeInsets.all(8),
+            shape: RoundedRectangleBorder(
+              borderRadius: BorderRadius.circular(30.0),
+            ),
+          ),
           child: Text(text),
           onPressed: () => _launchURL(url),
         ),