Enhanced bluetooth permission for iOS 13 and up (and fixed typo) (#648)

* Enhanced bluetooth permission for iOS 13 and up (and fixed typo)

* Update permission_handler/CHANGELOG.md

Co-authored-by: Maurits van Beusekom <maurits@vnbskm.nl>

* Return right permission when the permission is denied

* Update pubspec.yaml

Co-authored-by: Maurits van Beusekom <maurits@vnbskm.nl>

permission_handler/CHANGELOG.md

+## 8.2.3
+
+* iOS: Enhanced the `bluetooth` permission for iOS 13 and up, so the user gets prompted with the "bluetooth" permission dialog (see issue [#591](https://github.com/Baseflow/flutter-permission-handler/issues/591)).
+
 ## 8.2.2
 
 * Updated the README.md to mention setting the `compileSdkVersion` to `31`;
@@ -52,7 +56,7 @@
 ## 8.1.0
 
 * Added support for iOS 12+ Critical Alerts permission requesting.
-    * NOTE: This requires applying to Apple and recieving a special entitlement from them inorder to work. See [this article](https://medium.com/@shashidharyamsani/implementing-ios-critical-alerts-7d82b4bb5026) for an explination on how to use Critical Alerts.
+    * NOTE: This requires applying to Apple and receiving a special entitlement from them inorder to work. See [this article](https://medium.com/@shashidharyamsani/implementing-ios-critical-alerts-7d82b4bb5026) for an explination on how to use Critical Alerts.
 * Added support for Android M+ Access Notification Policy permission requesting (ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS).
     * Note: This opens a general page in settings, not specific to the package. 
 

permission_handler/ios/Classes/PermissionManager.m

@@ -132,7 +132,11 @@
         case PermissionGroupStorage:
             return [StoragePermissionStrategy new];
         case PermissionGroupBluetooth:
+            #if PERMISSION_BLUETOOTH
+            return [[BluetoothPermissionStrategy alloc] initWithBluetoothManager];
+            #else
             return [BluetoothPermissionStrategy new];
+            #endif
         case PermissionGroupAppTrackingTransparency:
             return [AppTrackingTransparencyPermissionStrategy new];
         case PermissionGroupCriticalAlerts:

permission_handler/ios/Classes/strategies/BluetoothPermissionStrategy.h

@@ -12,7 +12,8 @@
 
 #import <CoreBluetooth/CoreBluetooth.h>
 
-@interface BluetoothPermissionStrategy : NSObject <PermissionStrategy>
+@interface BluetoothPermissionStrategy : NSObject <PermissionStrategy, CBCentralManagerDelegate>
+-(instancetype)initWithBluetoothManager;
 @end
 
 #else

permission_handler/ios/Classes/strategies/BluetoothPermissionStrategy.m

@@ -9,31 +9,49 @@
 
 #if PERMISSION_BLUETOOTH
 
-@implementation BluetoothPermissionStrategy
+@implementation BluetoothPermissionStrategy {
+    CBCentralManager *_centralManager;
+    PermissionStatusHandler _permissionStatusHandler;
+    PermissionGroup _requestedPermission;
+}
+
+- (instancetype)initWithBluetoothManager {
+    self = [super init];
+    if (self) {
+        _centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
+    }
+    
+    return self;
+}
 
 - (PermissionStatus)checkPermissionStatus:(PermissionGroup)permission {
     if (@available(iOS 13.1, *)) {
-        CBManagerAuthorization blePermission = [CBCentralManager authorization];
+        CBManagerAuthorization blePermission = [_centralManager authorization];
         return [BluetoothPermissionStrategy parsePermission:blePermission];
     } else if (@available(iOS 13.0, *)){
-        CBCentralManager* manager = [[CBCentralManager alloc] init];
-        CBManagerAuthorization blePermission =  [manager authorization];
+        CBManagerAuthorization blePermission =  [_centralManager authorization];
         return [BluetoothPermissionStrategy parsePermission:blePermission];
     }
     return PermissionStatusGranted;
 }
 
 - (ServiceStatus)checkServiceStatus:(PermissionGroup)permission {
-    CBCentralManager* manager = [[CBCentralManager alloc] init];
     if (@available(iOS 10, *)) {
-        return [manager state] == CBManagerStatePoweredOn ? ServiceStatusEnabled : ServiceStatusDisabled;
+        return [_centralManager state] == CBManagerStatePoweredOn ? ServiceStatusEnabled : ServiceStatusDisabled;
     }
-    return [manager state] == CBCentralManagerStatePoweredOn ? ServiceStatusEnabled : ServiceStatusDisabled;
-    
+    return [_centralManager state] == CBCentralManagerStatePoweredOn ? ServiceStatusEnabled : ServiceStatusDisabled;
 }
 
 - (void)requestPermission:(PermissionGroup)permission completionHandler:(PermissionStatusHandler)completionHandler {
-    completionHandler([self checkPermissionStatus:permission]);
+    PermissionStatus status = [self checkPermissionStatus:permission];
+    
+    if (status != PermissionStatusDenied) {
+        completionHandler(status);
+        return;
+    }
+    
+    _permissionStatusHandler = completionHandler;
+    _requestedPermission = permission;
 }
 
 + (PermissionStatus)parsePermission:(CBManagerAuthorization)bluetoothPermission API_AVAILABLE(ios(13)){
@@ -43,11 +61,17 @@
         case CBManagerAuthorizationRestricted:
             return PermissionStatusRestricted;
         case CBManagerAuthorizationDenied:
-            return PermissionStatusDenied;
+            return PermissionStatusPermanentlyDenied;
         case CBManagerAuthorizationAllowedAlways:
             return PermissionStatusGranted;
     }
 }
+
+- (void)centralManagerDidUpdateState:(nonnull CBCentralManager *)centralManager {
+    PermissionStatus permissionStatus = [self checkPermissionStatus:_requestedPermission];
+    _permissionStatusHandler(permissionStatus);
+}
+
 @end
 
 #else

permission_handler/pubspec.yaml

 name: permission_handler
 description: Permission plugin for Flutter. This plugin provides a cross-platform (iOS, Android) API to request and check permissions.
-version: 8.2.2
+version: 8.2.3
 homepage: https://github.com/baseflowit/flutter-permission-handler
 
 flutter: