Reset scan view controller on rescanning (on iOS)

.gitignore

@@ -5,3 +5,4 @@
 .pub/
 
 build/
+example/.flutter-plugins-dependencies

example/pubspec.lock

@@ -1,13 +1,27 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.11"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.5.2"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.4.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -29,13 +43,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.14.11"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.1"
   core_card_io:
     dependency: "direct dev"
     description:
       path: ".."
       relative: true
     source: path
     version: "1.0.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -53,20 +81,27 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  image:
+    dependency: transitive
+    description:
+      name: image
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.4"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.5"
+    version: "0.12.6"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.7"
+    version: "1.1.8"
   path:
     dependency: transitive
     description:
@@ -81,6 +116,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0+1"
+  petitparser:
+    dependency: transitive
+    description:
+      name: petitparser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.4.0"
   quiver:
     dependency: transitive
     description:
@@ -134,7 +176,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.5"
+    version: "0.2.11"
   typed_data:
     dependency: transitive
     description:
@@ -149,5 +191,12 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.8"
+  xml:
+    dependency: transitive
+    description:
+      name: xml
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.5.0"
 sdks:
-  dart: ">=2.2.2 <3.0.0"
+  dart: ">=2.4.0 <3.0.0"

ios/Classes/CoreCardIoPlugin.m

@@ -24,7 +24,6 @@ - (instancetype)initWithViewController:(UIViewController *)viewController {
     self = [super init];
     if (self) {
         _viewController = viewController;
-        _scanViewController = [[CardIOPaymentViewController alloc] initWithPaymentDelegate:self];
     }
     return self;
 }
@@ -38,6 +37,7 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
     }
 
     if ([@"scanCard" isEqualToString:call.method]) {
+        _scanViewController = [[CardIOPaymentViewController alloc] initWithPaymentDelegate:self];
         _scanViewController.delegate = self;
 
         _result = result;
@@ -64,6 +64,7 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
 
 - (void)userDidCancelPaymentViewController:(CardIOPaymentViewController *)paymentViewController {
     [_scanViewController dismissViewControllerAnimated:YES completion:nil];
+    _scanViewController = nil;
     _result([NSNull null]);
     _result = nil;
     _arguments = nil;
@@ -103,6 +104,7 @@ - (void)userDidProvideCreditCardInfo:(CardIOCreditCardInfo *)info inPaymentViewC
         @"postalCode": ObjectOrNull(info.postalCode)
     });
     [_scanViewController dismissViewControllerAnimated:YES completion:nil];
+    _scanViewController = nil;
     _result = nil;
     _arguments = nil;
 }