# Constants

The following constants are available globally.

- `FlutterMethodNotImplemented`

  A constant used with `FlutterMethodCallHandler` to respond to the call of an unknown method.

  #### Declaration

  Objective-C

      extern const NSObject *_Nonnull FlutterMethodNotImplemented

  Swift

      var FlutterMethodNotImplemented: NSObject

- `FlutterEndOfEventStream`

  A constant used with `FlutterEventChannel` to indicate end of stream.

  #### Declaration

  Objective-C

      extern const NSObject *_Nonnull FlutterEndOfEventStream

  Swift

      var FlutterEndOfEventStream: NSObject

- `FlutterDefaultDartEntrypoint`

  The dart entrypoint that is associated with `main()`. This is to be used as an argument to the `runWithEntrypoint*` methods.

  #### Declaration

  Objective-C

      extern NSString *const _Nonnull FlutterDefaultDartEntrypoint

  Swift

      let FlutterDefaultDartEntrypoint: String

- `FlutterDefaultInitialRoute`

  The default Flutter initial route (“/”).

  #### Declaration

  Objective-C

      extern NSString *const _Nonnull FlutterDefaultInitialRoute

  Swift

      let FlutterDefaultInitialRoute: String

- `FlutterSemanticsUpdateNotification`

  The name used for semantic update notifications via `NSNotificationCenter`.

  The object passed as the sender is the `FlutterViewController` associated with the update.

  #### Declaration

  Objective-C

      extern const NSNotificationName _Nonnull FlutterSemanticsUpdateNotification

  Swift

      static let FlutterSemanticsUpdate: NSNotification.Name

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