TF-501 [iOS] add Mail app to be Default mail

ios/Runner/AppDelegate.swift

@@ -15,6 +15,18 @@ import receive_sharing_intent
                 FlutterDownloaderPlugin.register(with: registry.registrar(forPlugin: "FlutterDownloaderPlugin")!)
             }
         }
+        
+        let sharingIntent = SwiftReceiveSharingIntentPlugin.instance
+        if let url = launchOptions?[UIApplication.LaunchOptionsKey.url] as? URL {
+            if url.scheme == "mailto" {
+                if let url = handleEmailAndress(open: url) {
+                    let corrected = launchOptions!.map { (key, value) in key != .url ? (key, value) : (key, url) }
+
+                    return sharingIntent.application(application, didFinishLaunchingWithOptions: Dictionary(uniqueKeysWithValues: corrected))
+                }
+            }
+        }
+        
         return super.application(application, didFinishLaunchingWithOptions: launchOptions)
     }
     
@@ -24,6 +36,11 @@ import receive_sharing_intent
             return sharingIntent.application(app, open: url, options: options)
         }
         
+        if url.scheme == "mailto" {
+            if let url = handleEmailAndress(open: url) {
+                return sharingIntent.application(app, open: url, options: options)
+            }
+        }
          // For example load MSALPublicClientApplication
          // return MSALPublicClientApplication.handleMSALResponse(url, sourceApplication: options[.sourceApplication] as? String)
 
@@ -34,4 +51,18 @@ import receive_sharing_intent
          return super.application(app, open: url, options:options)
     }
     
+    private func handleEmailAndress(open url: URL) -> URL? {
+        let appDomain = Bundle.main.bundleIdentifier!
+        let appGroupId = (Bundle.main.object(forInfoDictionaryKey: "AppGroupId") as? String) ?? "group.\(Bundle.main.bundleIdentifier!)"
+        let sharedKey = "ShareKey"
+        var sharedText: [String] = []
+        if let email = url.absoluteString.components(separatedBy: ":").last {
+            sharedText.append(email)
+        }
+        let userDefaults = UserDefaults(suiteName: appGroupId)
+        userDefaults?.set(sharedText, forKey: sharedKey)
+        userDefaults?.synchronize()
+        return URL(string: "ShareMedia-\(appDomain)://dataUrl=\(sharedKey)#text")
+    }
+    
 }