[connectivity] Fix reachability stream for iOS (#2281)

Author: mehmetf

packages/connectivity/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.4.5+6
+
+* Fix singleton Reachability problem on iOS.
+
 ## 0.4.5+5
 
 * Add an analyzer check for the public documentation.

packages/connectivity/ios/Classes/ConnectivityPlugin.m

@@ -22,6 +22,7 @@ @interface FLTConnectivityPlugin () <FlutterStreamHandler, CLLocationManagerDele
 
 @implementation FLTConnectivityPlugin {
   FlutterEventSink _eventSink;
+  Reachability* _reachabilityForInternetConnection;
 }
 
 + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
@@ -174,12 +175,16 @@ - (FlutterError*)onListenWithArguments:(id)arguments eventSink:(FlutterEventSink
                                            selector:@selector(onReachabilityDidChange:)
                                                name:kReachabilityChangedNotification
                                              object:nil];
-  [[Reachability reachabilityForInternetConnection] startNotifier];
+  _reachabilityForInternetConnection = [Reachability reachabilityForInternetConnection];
+  [_reachabilityForInternetConnection startNotifier];
   return nil;
 }
 
 - (FlutterError*)onCancelWithArguments:(id)arguments {
-  [[Reachability reachabilityForInternetConnection] stopNotifier];
+  if (_reachabilityForInternetConnection) {
+    [_reachabilityForInternetConnection stopNotifier];
+    _reachabilityForInternetConnection = nil;
+  }
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   _eventSink = nil;
   return nil;

packages/connectivity/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for discovering the state of the network (WiFi &
   mobile/cellular) connectivity on Android and iOS.
 author: Flutter Team <[email protected]>
 homepage: https://github.com/flutter/plugins/tree/master/packages/connectivity
-version: 0.4.5+5
+version: 0.4.5+6
 
 flutter:
   plugin: