Added the shared now playing implementation

ios/Classes/FCPEnums.swift

@@ -23,6 +23,7 @@ enum FCPChannelTypes {
   static let onPresentStateChanged = "onPresentStateChanged"
   static let popTemplate = "popTemplate"
   static let pushTemplate = "pushTemplate"
+  static let showNowPlaying = "showNowPlaying"
   static let closePresent = "closePresent"
   static let onGridButtonPressed = "onGridButtonPressed"
   static let setActionSheet = "setActionSheet"

ios/Classes/SwiftFlutterCarplayPlugin.swift

@@ -169,6 +169,14 @@ public class SwiftFlutterCarplayPlugin: NSObject, FlutterPlugin {
       self.objcPresentTemplate = nil
       result(true)
       break
+    case FCPChannelTypes.showNowPlaying:
+      guard let animated = call.arguments as? Bool else {
+        result(false)
+        return
+      }
+      FlutterCarPlaySceneDelegate.push(template: CPNowPlayingTemplate.shared, animated: animated)
+      result(true)
+      break
     case FCPChannelTypes.pushTemplate:
       guard let args = call.arguments as? [String : Any] else {
         result(false)

lib/carplay_worker.dart

@@ -288,4 +288,17 @@ class FlutterCarplay {
       throw TypeError();
     }
   }
+
+  /// Navigate to the shared instance of the NowPlaying Template
+  ///
+  /// - If animated is true, CarPlay animates the transition between templates.
+  static Future<bool> showSharedNowPlaying({
+    bool animated = true,
+  }) async {
+    bool isCompleted = await _carPlayController.reactToNativeModule(
+      FCPChannelTypes.showNowPlaying,
+      animated,
+    );
+    return isCompleted;
+  }
 }

lib/constants/private_constants.dart

@@ -11,6 +11,7 @@ enum FCPChannelTypes {
   popTemplate,
   closePresent,
   pushTemplate,
+  showNowPlaying,
   onGridButtonPressed,
   setActionSheet,
   onBarButtonPressed,