7 Commits

Author SHA1 Message Date
LongCatIsLooong
894f27ef71
Make FlutterSceneLifeCycleProvider.sceneLifeCycleDelegate readonly (#177240)
And add documentation that says it should not change because the
delegate implementation is stateful.

## Pre-launch Checklist

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2025-10-20 23:14:09 +00:00
Victoria Ashworth
00da9435e3
Rename UIScene integration test projects and fix Xcode compatibility (#176635)
This PR renames the UIScene integration test projects, makes them
compatible with Xcode 16, and organizes the tests.

## Pre-launch Checklist

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- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
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2025-10-07 21:56:01 +00:00
Victoria Ashworth
5c66c53a31
Handle FlutterEngine registration when embedded in Multi-Scene apps (#176490)
When Multi-Scene is enabled, Flutter cannot automatically associate the
engine with a scene during the scene connection phase in most cases.
However, the `scene:willConnectToSession:options:` event is critical for
some Flutter plugins that rely on scene connection options (the
scene-equivalent of application launch options).

To workaround this, this PR adds two things:
* Adds a way to manually register a `FlutterEngine` with a
`FlutterPluginSceneLifeCycleDelegate`. Manually registered engines must
also be manually unregistered.
  * This use case is for add to app
* Automatically registers a `FlutterEngine` if the `rootViewController`
of the scene is a `FlutterViewController`
* This use case is for if a Flutter app (not add-to-app) were to enable
multi-scene since the `rootViewController` of the storyboard is a
`FlutterViewController`
  
This PR also makes a fix for when a `FlutterView` is removed from the
scene:
* If a `FlutterView` is removed from a scene, keep the `FlutterEngine`
associated with the scene until it is assigned to a new scene

## Pre-launch Checklist

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- [x] I added new tests to check the change I am making, or this PR is
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2025-10-07 02:40:02 +00:00
Victoria Ashworth
01474413c5
Add an AppDelegate callback for implicit FlutterEngines (#176240)
This PR introduces a new protocol `FlutterImplicitEngineDelegate`, which
adds a callback called `didInitializeImplicitFlutterEngine`, which
returns a new interface called `FlutterImplicitEngineBridge`.

This was added to expose parts of an implicit `FlutterEngine`, such as
when created from a `FlutterViewController` in a storyboard.

``` swift diff
@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
    // Register plugins with `engineBridge.pluginRegistry`
    GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)

    // Create method channels with `engineBridge.applicationRegistrar.messenger()`
    let batteryChannel = FlutterMethodChannel(
      name: "samples.flutter.dev/battery",
      binaryMessenger: engineBridge.applicationRegistrar.messenger()
    )
    ...

    // Create platform views with `engineBridge.applicationRegistrar.messenger()`
    let factory = FLNativeViewFactory(messenger: engineBridge.applicationRegistrar.messenger())
    ...
}
```

This PR also refactors `FlutterPluginRegistrar` into 3 separate
protocols:
* `FlutterBaseRegistrar`
* `FlutterApplicationRegistrar`
* `FlutterPluginRegistrar`

Most methods are moved from `FlutterPluginRegistrar` to
`FlutterBaseRegistrar` and then `FlutterPluginRegistrar` and
`FlutterApplicationRegistrar` inherit from `FlutterBaseRegistrar`.
`FlutterPluginRegistrar` also has additional methods specific to it -
there are no meaningful/breaking changes to `FlutterPluginRegistrar`.

Fixes https://github.com/flutter/flutter/issues/173357.

## Pre-launch Checklist

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we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
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2025-10-06 14:22:27 +00:00
Victoria Ashworth
b3ecbb9034
Add state restoration for UIScene migration (#176305)
When an iOS app migrates to UIScene, the application events for handling
state restoration are no longer called by UIKit. Instead, scene events
in the SceneDelegate must be used. This PR adds support for handling
state restoration in UIScene while still maintaining support for
unmigrated apps, as well.

Fixes https://github.com/flutter/flutter/issues/174402.

## Pre-launch Checklist

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- [x] I added new tests to check the change I am making, or this PR is
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2025-10-03 19:08:08 +00:00
Victoria Ashworth
80496d7662
Add SwiftUI support for UIScene migration (#176230)
When embedding Flutter in a SwiftUI app, it appears that SwiftUI wraps
the scene delegate given by the developer in an internal class called
`SwiftUI.AppSceneDelegate`. This causes the scene delegate to fail to
check if it conforms to the `FlutterSceneLifeCycleProvider` protocol -
even though it does. However, after force casting it, selectors respond
and can be used.

## Pre-launch Checklist

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- [x] I read and followed the [Flutter Style Guide], including [Features
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- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
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- [x] All existing and new tests are passing.

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2025-10-01 14:24:37 +00:00
Victoria Ashworth
7382e9361f
Add scene plugin lifecycle events (#175866)
This PR forwards scene lifecycle events from the SceneDelegate to
registered plugins.

This PR introduced 3 new public APIs:
* `FlutterSceneLifeCycleDelegate` (protocol) - This is the protocol that
plugins conform to
* `FlutterSceneLifeCycleProvider` (protocol) - This is the protocol that
a SceneDelegate can conform to instead of `FlutterSceneDelegate`
* `FlutterPluginSceneLifeCycleDelegate` (interface) - This is the class
object that a SceneDelegate using `FlutterSceneLifeCycleProvider` can
use to forward scene events to

The flow of events are as followed when SceneDelegate subclasses the
`FlutterSceneDelegate`:
* `FlutterSceneDelegate` receives `sceneDidBecomeActive` event from
UIKit
* `FlutterSceneDelegate` forwards `sceneDidBecomeActive` to
`FlutterPluginSceneLifeCycleDelegate`
* `FlutterPluginSceneLifeCycleDelegate` loops through each
`FlutterEngine` it has and forwards `sceneDidBecomeActive` to the
engine's `FlutterEnginePluginSceneLifeCycleDelegate`
* `FlutterEnginePluginSceneLifeCycleDelegate` loops through each plugin
that conforms to `FlutterSceneLifeCycleDelegate` it has and forwards
`sceneDidBecomeActive` to the plugin
* `FlutterPluginSceneLifeCycleDelegate` forwards `sceneDidBecomeActive`
to `FlutterPluginAppLifeCycleDelegate` using
`sceneDidBecomeActiveFallback`
* `FlutterPluginAppLifeCycleDelegate` loops through all plugins and
calls `applicationDidBecomeActive` if the plugin does not conform to
`FlutterSceneLifeCycleDelegate`
  
When using `FlutterSceneLifeCycleProvider` instead of
`FlutterSceneDelegate`, scene events are manually forwarded to
`FlutterPluginSceneLifeCycleDelegate` by the iOS developer. For example:

```swift
class SceneDelegate: UIResponder, UIWindowSceneDelegate, FlutterSceneLifeCycleProvider {

  var sceneLifeCycleDelegate: FlutterPluginSceneLifeCycleDelegate = FlutterPluginSceneLifeCycleDelegate()

  func sceneDidBecomeActive(_ scene: UIScene) {
    sceneLifeCycleDelegate.sceneDidBecomeActive(scene)
  }
```

Fixes https://github.com/flutter/flutter/issues/174398.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
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- [x] I read the [Tree Hygiene] wiki page, which explains my
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- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
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2025-09-29 17:57:12 +00:00