[url_launcher] When not fully loaded, clicking close causes the callback to not be triggered correctly. (#8582)

When SFSafariViewController is loading a webpage, if the close button is clicked during the loading process, it can prevent the callback from being triggered correctly.

*List which issues are fixed by this PR. You must list at least one issue.*

- Fixes flutter/flutter#161790
- Fixes flutter/flutter#47271

Author: StanleyCocos

packages/url_launcher/url_launcher_ios/CHANGELOG.md

@@ -1,6 +1,7 @@
-## NEXT
+## 6.3.3
 
 * Updates minimum supported SDK version to Flutter 3.22/Dart 3.4.
+* Ensures the completion callback is invoked if the user dismisses the Safari view before the initial URL load completes.
 
 ## 6.3.2
 

packages/url_launcher/url_launcher_ios/example/ios/RunnerTests/URLLauncherTests.swift

@@ -131,6 +131,24 @@ final class URLLauncherTests: XCTestCase {
     XCTAssertEqual(launcher.passedOptions?[.universalLinksOnly] as? Bool, true)
   }
 
+  func testLaunchSafariViewControllerWithClose() {
+    let launcher = FakeLauncher()
+    let plugin = createPlugin(launcher: launcher)
+
+    let expectation = XCTestExpectation(description: "completion called")
+    plugin.openUrlInSafariViewController(url: "https://flutter.dev") { result in
+      switch result {
+      case .success(let details):
+        XCTAssertEqual(details, .dismissed)
+      case .failure(let error):
+        XCTFail("Unexpected error: \(error)")
+      }
+      expectation.fulfill()
+    }
+    plugin.closeSafariViewController()
+    wait(for: [expectation], timeout: 30)
+  }
+
 }
 
 final private class FakeLauncher: NSObject, Launcher {

packages/url_launcher/url_launcher_ios/ios/url_launcher_ios/Sources/url_launcher_ios/URLLaunchSession.swift

@@ -12,6 +12,7 @@ final class URLLaunchSession: NSObject, SFSafariViewControllerDelegate {
 
   private let completion: OpenInSafariCompletionHandler
   private let url: URL
+  private var isLoadCompleted: Bool = false
 
   /// The Safari view controller used for displaying the URL.
   let safariViewController: SFSafariViewController
@@ -46,12 +47,16 @@ final class URLLaunchSession: NSObject, SFSafariViewControllerDelegate {
     } else {
       completion(.success(.failedToLoad))
     }
+    isLoadCompleted = true
   }
 
   /// Called when the user finishes using the Safari view controller.
   ///
   /// - Parameter controller: The Safari view controller.
   func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
+    if !isLoadCompleted {
+      completion(.success(.dismissed))
+    }
     controller.dismiss(animated: true, completion: nil)
     didFinish?()
   }

packages/url_launcher/url_launcher_ios/ios/url_launcher_ios/Sources/url_launcher_ios/messages.g.swift

@@ -85,6 +85,8 @@ enum InAppLoadResult: Int {
   case failedToLoad = 1
   /// The URL could not be launched because it is invalid.
   case invalidUrl = 2
+  /// The controller was closed before loading.
+  case dismissed = 3
 }
 
 private class messagesPigeonCodecReader: FlutterStandardReader {

packages/url_launcher/url_launcher_ios/lib/src/messages.g.dart

@@ -40,6 +40,9 @@ enum InAppLoadResult {
 
   /// The URL could not be launched because it is invalid.
   invalidUrl,
+
+  /// The controller was closed before loading.
+  dismissed,
 }
 
 class _PigeonCodec extends StandardMessageCodec {

packages/url_launcher/url_launcher_ios/lib/url_launcher_ios.dart

@@ -141,6 +141,8 @@ class UrlLauncherIOS extends UrlLauncherPlatform {
         throw _failedSafariViewControllerLoadException(url);
       case InAppLoadResult.invalidUrl:
         throw _invalidUrlException();
+      case InAppLoadResult.dismissed:
+        return false;
     }
   }
 

packages/url_launcher/url_launcher_ios/pigeons/messages.dart

@@ -32,6 +32,9 @@ enum InAppLoadResult {
 
   /// The URL could not be launched because it is invalid.
   invalidUrl,
+
+  /// The controller was closed before loading.
+  dismissed,
 }
 
 @HostApi()

packages/url_launcher/url_launcher_ios/pubspec.yaml

@@ -2,7 +2,7 @@ name: url_launcher_ios
 description: iOS implementation of the url_launcher plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/url_launcher/url_launcher_ios
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+url_launcher%22
-version: 6.3.2
+version: 6.3.3
 
 environment:
   sdk: ^3.4.0