fix(share_plus): Present Share Sheet on the top ViewController (continuation) (#307)

* Present on Top ViewController 

- Present share sheet on the currently visible view controller.

* Update CHANGELOG

* Update Share v2.1.3 Pubspec

* format share_plus ios code

Co-authored-by: Ray Li <[email protected]>
Co-authored-by: Miquel Beltran <[email protected]>

Author: miquelbeltran

packages/share_plus/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 2.1.3
+
+- Update iOS share target to present on the top ViewController. This fixes "Unable to present" errors when the app is already presenting such as in an add to app scenario.
+
 # 2.1.2
 
 - Do not tear down method channel onDetachedFromActivity.

packages/share_plus/ios/Classes/FLTSharePlusPlugin.m

@@ -7,6 +7,21 @@
 
 static NSString *const PLATFORM_CHANNEL = @"dev.fluttercommunity.plus/share";
 
+static UIViewController *RootViewController() {
+  return [UIApplication sharedApplication].keyWindow.rootViewController;
+}
+
+static UIViewController *TopViewControllerForViewController(UIViewController *viewController) {
+  if (viewController.presentedViewController) {
+    return TopViewControllerForViewController(viewController.presentedViewController);
+  }
+  if ([viewController isKindOfClass:[UINavigationController class]]) {
+    return TopViewControllerForViewController(
+        ((UINavigationController *)viewController).visibleViewController);
+  }
+  return viewController;
+}
+
 @interface SharePlusData : NSObject <UIActivityItemSource>
 
 @property(readonly, nonatomic, copy) NSString *subject;
@@ -135,9 +150,11 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
         return;
       }
 
+      UIViewController *topViewController =
+          TopViewControllerForViewController(RootViewController());
       [self shareText:shareText
                  subject:shareSubject
-          withController:[UIApplication sharedApplication].keyWindow.rootViewController
+          withController:topViewController
                 atSource:originRect];
       result(nil);
     } else if ([@"shareFiles" isEqualToString:call.method]) {
@@ -162,11 +179,13 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
         }
       }
 
+      UIViewController *topViewController =
+          TopViewControllerForViewController(RootViewController());
       [self shareFiles:paths
             withMimeType:mimeTypes
              withSubject:subject
                 withText:text
-          withController:[UIApplication sharedApplication].keyWindow.rootViewController
+          withController:topViewController
                 atSource:originRect];
       result(nil);
     } else {

packages/share_plus/pubspec.yaml

@@ -1,6 +1,6 @@
 name: share_plus
 description: Flutter plugin for sharing content via the platform share UI, using the ACTION_SEND intent on Android and UIActivityViewController on iOS.
-version: 2.1.2
+version: 2.1.3
 homepage: https://plus.fluttercommunity.dev/
 repository: https://github.com/fluttercommunity/plus_plugins/tree/main/packages/