[camera]handle iOS camera access permission

packages/camera/camera/CHANGELOG.md

@@ -1,6 +1,6 @@
 ## 0.9.5
 
-* Adds camera access permission handling logic on iOS to fix a related crash when first time using the camera.
+* Adds camera access permission handling logic on iOS to fix a related crash when using the camera for the first time.
 
 ## 0.9.4+24
 
@@ -26,7 +26,7 @@
 
 ## 0.9.4+19
 
-* Migrates deprecated Scaffold SnackBar methods to ScaffoldMessenger.
+* Migrate deprecated Scaffold SnackBar methods to ScaffoldMessenger.
 
 ## 0.9.4+18
 

packages/camera/camera/README.md

@@ -86,21 +86,13 @@ Permission errors may be thrown when initializing the camera controller, and you
 
 Here is a list of all permission error codes that can be thrown:
 
-- CameraAccessDenied
-Thrown when user denied the camera access permission.
+- `CameraAccessDenied`: Thrown when user denies the camera access permission.
 
-- CameraAccessDeniedWithoutPrompt
-iOS only for now.
-Thrown when user has previously denied the permission.
-iOS does not allow prompting alert dialog a second time. Users will have to go to Settings > Privacy in order to enable camera access.
+- `CameraAccessDeniedWithoutPrompt`: iOS only for now. Thrown when user has previously denied the permission. iOS does not allow prompting alert dialog a second time. Users will have to go to Settings > Privacy in order to enable camera access.
 
-- CameraAccessRestricted
-iOS only for now.
-Thrown when camera access is restricted and users cannot grant permission (parental control).
+- `CameraAccessRestricted`: iOS only for now. Thrown when camera access is restricted and users cannot grant permission (parental control).
 
-- cameraPermission
-Android and Web only.
-A legacy error code for all kinds of camera permission errors.
+- `cameraPermission`: Android and Web only. A legacy error code for all kinds of camera permission errors.
 
 ### Example
 
@@ -141,14 +133,16 @@ class _CameraAppState extends State<CameraApp> {
         return;
       }
       setState(() {});
-    }).catchError((e) {
-      switch (e.code) {
-        case 'CameraAccessDenied':
-          print('User denied camera access.');
-          break;
-        default:
-          print('Handle other errors.');
-          break;
+    }).catchError((dynamic e) {
+      if (e is CameraException) {
+        switch (e.code) {
+          case 'CameraAccessDenied':
+            print('User denied camera access.');
+            break;
+          default:
+            print('Handle other errors.');
+            break;
+        }
       }
     });
   }

packages/camera/camera/example/lib/main.dart

@@ -699,8 +699,7 @@ class _CameraExampleHomeState extends State<CameraExampleHome>
           break;
         case 'cameraPermission':
           // Android & web only
-          showInSnackBar(
-              'Legacy error code for all kinds of permission errors');
+          showInSnackBar('Unknown permission error.');
           break;
         default:
           _showCameraException(e);

packages/camera/camera/example/lib/readme_full_example.dart

@@ -36,14 +36,16 @@ class _CameraAppState extends State<CameraApp> {
         return;
       }
       setState(() {});
-    }).catchError((e) {
-      switch (e.code) {
-        case 'CameraAccessDenied':
-          print('User denied camera access.');
-          break;
-        default:
-          print('Handle other errors.');
-          break;
+    }).catchError((dynamic e) {
+      if (e is CameraException) {
+        switch (e.code) {
+          case 'CameraAccessDenied':
+            print('User denied camera access.');
+            break;
+          default:
+            print('Handle other errors.');
+            break;
+        }
       }
     });
   }

packages/camera/camera/ios/Classes/CameraPermissionUtils.h

@@ -8,9 +8,11 @@
 typedef void (^FLTCameraPermissionRequestCompletionHandler)(FlutterError *);
 
 /// Requests camera access permission.
+///
 /// If it is the first time requesting camera access, a permission dialog will show up on the
 /// screen. Otherwise AVFoundation simply returns the user's previous choice, and in this case the
 /// user will have to update the choice in Settings app.
+///
 /// @param handler if access permission is (or was previously) granted, completion handler will be
 /// called without error; Otherwise completion handler will be called with error. Handler can be
 /// called on an arbitrary dispatch queue.