Fix analyses errors

example/ios/Runner.xcodeproj/project.pbxproj

@@ -222,7 +222,7 @@
 			);
 			inputPaths = (
 				"${SRCROOT}/Pods/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
-				"${PODS_ROOT}/../.symlinks/flutter/ios-release/Flutter.framework",
+				"${PODS_ROOT}/../.symlinks/flutter/ios/Flutter.framework",
 				"${BUILT_PRODUCTS_DIR}/permission_handler/permission_handler.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";

lib/permission_handler.dart

@@ -32,7 +32,7 @@ class PermissionHandler {
   /// Returns a [Future] containing the current permission status for the supplied [PermissionGroup].
   Future<PermissionStatus> checkPermissionStatus(
       PermissionGroup permission) async {
-    final dynamic status = await _methodChannel.invokeMethod(
+    final String status = await _methodChannel.invokeMethod(
         'checkPermissionStatus', Codec.encodePermissionGroup(permission));
 
     return Codec.decodePermissionStatus(status);
@@ -52,7 +52,7 @@ class PermissionHandler {
   Future<Map<PermissionGroup, PermissionStatus>> requestPermissions(
       List<PermissionGroup> permissions) async {
     final String jsonData = Codec.encodePermissionGroups(permissions);
-    final dynamic status =
+    final String status =
         await _methodChannel.invokeMethod('requestPermissions', jsonData);
 
     return Codec.decodePermissionRequestResult(status);

lib/utils/codec.dart

 part of permission_handler;
 
 class Codec {
-  static PermissionStatus decodePermissionStatus(dynamic value) {
-    final dynamic permission = json.decode(value.toString());
+  static PermissionStatus decodePermissionStatus(String value) {
+    final dynamic permission = json.decode(value);
 
     return PermissionStatus.values.firstWhere(
         (PermissionStatus e) => e.toString().split('.').last == permission);
   }
 
   static Map<PermissionGroup, PermissionStatus> decodePermissionRequestResult(
-      dynamic value) {
-    final Map<String, dynamic> jsonObject = json.decode(value.toString());
+      String value) {
+    final Map<String, dynamic> jsonObject = json.decode(value);
 
     final Map<PermissionGroup, PermissionStatus> permissionResults =
         <PermissionGroup, PermissionStatus>{};