Add Persistent flag for permanentlyDenied LocationAlways permission (#822)

* add persistent flag for already denied

* add missing const key

* bump permission_handler_apple to 9.0.4

permission_handler_apple/CHANGELOG.md

+## 9.0.4
+
+* Add flag inside `UserDefaults` to save whether locationAlways has already been requested and prevent further requests, which would be left unanswered by the system.
+
 ## 9.0.3
 
 * Ensures a request for `locationAlways` permission returns a result unblocking the permission request and preventing the `ERROR_ALREADY_REQUESTING_PERMISSIONS` error for subsequent permission request.
 
 ## 9.0.2
 
-* Moves Apple implementation into its own package.
\ No newline at end of file
+* Moves Apple implementation into its own package.

permission_handler_apple/ios/Classes/strategies/LocationPermissionStrategy.m

@@ -7,6 +7,8 @@
 
 #if PERMISSION_LOCATION
 
+NSString *const UserDefaultPermissionRequestedKey = @"org.baseflow.permission_handler_apple.permission_requested";
+
 @interface LocationPermissionStrategy ()
 - (void) receiveActivityNotification:(NSNotification *)notification;
 @end
@@ -38,8 +40,12 @@
 - (void)requestPermission:(PermissionGroup)permission completionHandler:(PermissionStatusHandler)completionHandler {
     PermissionStatus status = [self checkPermissionStatus:permission];
     if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedWhenInUse && permission == PermissionGroupLocationAlways) {
-        // don't do anything and continue requesting permissions
-    } else if (status != PermissionStatusDenied) {
+        BOOL alreadyRequested = [[NSUserDefaults standardUserDefaults] boolForKey:UserDefaultPermissionRequestedKey]; // check if already requested the permantent permission
+        if(alreadyRequested) {
+            completionHandler(status);
+            return;
+        }
+    } else if (status != PermissionStatusDenied) { // handles undetermined always permission and denied whenInUse permission
         completionHandler(status);
         return;
     }
@@ -59,6 +65,7 @@
         if ([[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysUsageDescription"] != nil) {
             [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveActivityNotification:) name:UIApplicationDidBecomeActiveNotification object:nil];
             [_locationManager requestAlwaysAuthorization];
+            [[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:UserDefaultPermissionRequestedKey];
         } else {
             [[NSException exceptionWithName:NSInternalInconsistencyException reason:@"To use location in iOS8 you need to define NSLocationAlwaysUsageDescription in the app bundle's Info.plist file" userInfo:nil] raise];
         }

permission_handler_apple/ios/permission_handler_apple.podspec

@@ -3,7 +3,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'permission_handler_apple'
-  s.version          = '9.0.2'
+  s.version          = '9.0.4'
   s.summary          = 'Permission plugin for Flutter.'
   s.description      = <<-DESC
 Permission plugin for Flutter. This plugin provides a cross-platform (iOS, Android) API to request and check permissions.

permission_handler_apple/pubspec.yaml

 name: permission_handler_apple
 description: Permission plugin for Flutter. This plugin provides the iOS API to request and check permissions.
-version: 9.0.3
+version: 9.0.4
 homepage: https://github.com/baseflow/flutter-permission-handler
 
 environment: