fix: init CBCentralManager lazely (#738)

* fix: init CBCentralManager lazely

* prepare release 9.0.0

permission_handler/CHANGELOG.md

+## 9.0.0
+
+* iOS: Bluetooth permission dialog now appears when requested instead of when the app is initialized.
+Note: Requesting Bluetooth status will also prompt the permission dialog (see issue [#591](https://github.com/Baseflow/flutter-permission-handler/issues/591)).
+
 ## 8.3.0
 
 * Updated Android Gradle Plugin to 4.1.0 and Gradle Wrapper to 6.7 which is inline with the current Flutter stable version (Flutter 2.5.3).

permission_handler/ios/Classes/PermissionManager.m

@@ -132,11 +132,7 @@
         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

@@ -13,7 +13,7 @@
 #import <CoreBluetooth/CoreBluetooth.h>
 
 @interface BluetoothPermissionStrategy : NSObject <PermissionStrategy, CBCentralManagerDelegate>
--(instancetype)initWithBluetoothManager;
+- (void)initManagerIfNeeded;
 @end
 
 #else

permission_handler/ios/Classes/strategies/BluetoothPermissionStrategy.m

@@ -15,16 +15,14 @@
     PermissionGroup _requestedPermission;
 }
 
-- (instancetype)initWithBluetoothManager {
-    self = [super init];
-    if (self) {
+- (void)initManagerIfNeeded {
+    if (_centralManager == nil) {
         _centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
     }
-    
-    return self;
 }
 
 - (PermissionStatus)checkPermissionStatus:(PermissionGroup)permission {
+    [self initManagerIfNeeded];
     if (@available(iOS 13.1, *)) {
         CBManagerAuthorization blePermission = [_centralManager authorization];
         return [BluetoothPermissionStrategy parsePermission:blePermission];
@@ -36,6 +34,7 @@
 }
 
 - (ServiceStatus)checkServiceStatus:(PermissionGroup)permission {
+    [self initManagerIfNeeded];
     if (@available(iOS 10, *)) {
         return [_centralManager state] == CBManagerStatePoweredOn ? ServiceStatusEnabled : ServiceStatusDisabled;
     }
@@ -43,6 +42,7 @@
 }
 
 - (void)requestPermission:(PermissionGroup)permission completionHandler:(PermissionStatusHandler)completionHandler {
+    [self initManagerIfNeeded];
     PermissionStatus status = [self checkPermissionStatus:permission];
     
     if (status != PermissionStatusDenied) {

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: 8.3.0
+version: 9.0.0
 homepage: https://github.com/baseflowit/flutter-permission-handler
 
 flutter: