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Add a note on working around a potential crash on iOS #13244

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Add a note on working around a potential crash on iOS
sfshaza2 Apr 1, 2026
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Tweaking
sfshaza2 Apr 1, 2026
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20 changes: 20 additions & 0 deletions src/content/platform-integration/platform-channels.md
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Expand Up @@ -612,6 +612,16 @@ Override the `application:didFinishLaunchingWithOptions:` function and create
a `FlutterMethodChannel` tied to the channel name
`samples.flutter.dev/battery`:

:::note
If your app adopts the `UISceneDelegate` lifecycle,
`window` will be `nil` during `application(_:didFinishLaunchingWithOptions:)`.
To avoid a crash, instantiate your `FlutterMethodChannel`
and set its call handler within your `SceneDelegate`'s
`scene(_:willConnectTo:options:)` method,
accessing the controller by using
`window?.rootViewController as? FlutterViewController`.
:::

```swift title="AppDelegate.swift"
@main
@objc class AppDelegate: FlutterAppDelegate {
Expand Down Expand Up @@ -695,6 +705,16 @@ didFinishLaunchingWithOptions:` method.
Make sure to use the same channel name
as was used on the Flutter client side.

:::note
If your app adopts the `UISceneDelegate` lifecycle,
`window` will be `nil` during `application:didFinishLaunchingWithOptions:`.
To avoid a crash, instantiate your `FlutterMethodChannel`
and set its call handler within your `SceneDelegate`'s
`scene:willConnectToSession:options:` method,
accessing the controller by using
`(FlutterViewController*)self.window.rootViewController`.
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@johnpryan johnpryan Apr 1, 2026

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I don't know if this is correct or not, I'll need to defer to @jmagman on this.

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@jmagman jmagman Apr 3, 2026

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I think @LouiseHsu messaged @sfshaza2 with some code samples.

:::

```objc title="AppDelegate.m"
#import <Flutter/Flutter.h>
#import "GeneratedPluginRegistrant.h"
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