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FlutterHeadlessDartRunner Class Reference

`#import <FlutterHeadlessDartRunner.h>`

Inheritance diagram for FlutterHeadlessDartRunner:

## Instance Methods
(instancetype) | - initWithName:project:
(instancetype) | - initWithName:project:allowHeadlessExecution:
(instancetype) | - initWithName:project:allowHeadlessExecution:restorationEnabled:
(instancetype) | - init
Instance Methods inherited from FlutterEngine
(instancetype) | - initWithName:
(instancetype) | - initWithName:project:
(instancetype) | - initWithName:project:allowHeadlessExecution:
(instancetype) | - initWithName:project:allowHeadlessExecution:restorationEnabled:
(BOOL) | - run
(BOOL) | - runWithEntrypoint:
(BOOL) | - runWithEntrypoint:initialRoute:
(BOOL) | - runWithEntrypoint:libraryURI:
(BOOL) | - runWithEntrypoint:libraryURI:initialRoute:
(BOOL) | - runWithEntrypoint:libraryURI:initialRoute:entrypointArgs:
(void) | - destroyContext
(void) | - ensureSemanticsEnabled
(NSURL *observatoryUrl) | - FLUTTER_DEPRECATED
(flutter::Shell &) | - shell
(void) | - setBinaryMessenger:
(flutter::IOSRenderingAPI) | - platformViewsRenderingAPI
(void) | - waitForFirstFrame:callback:
(FlutterEngine *) | - spawnWithEntrypoint:libraryURI:initialRoute:entrypointArgs:
(const flutter::ThreadHost &) | - threadHost
(void) | - updateDisplays
(void) | - flutterTextInputView:performAction:withClient:
(void) | - sceneWillEnterForeground:
(void) | - sceneDidEnterBackground:
(void) | - applicationWillEnterForeground:
(void) | - applicationDidEnterBackground:
Instance Methods inherited from <FlutterPluginRegistry>
(nullable NSObject< FlutterPluginRegistrar > *) | - registrarForPlugin:
(BOOL) | - hasPlugin:
(nullable NSObject *) | - valuePublishedByPlugin:

## Additional Inherited Members
Properties inherited from FlutterEngine
FlutterViewController * | viewController
FlutterMethodChannel * | localizationChannel
FlutterMethodChannel * | navigationChannel
FlutterMethodChannel * | restorationChannel
FlutterMethodChannel * | platformChannel
FlutterMethodChannel * | textInputChannel
FlutterBasicMessageChannel * | lifecycleChannel
FlutterBasicMessageChannel * | systemChannel
FlutterBasicMessageChannel * | settingsChannel
FlutterBasicMessageChannel * | keyEventChannel
NSURL * | vmServiceUrl
NSObject< FlutterBinaryMessenger > * | binaryMessenger
NSObject< FlutterTextureRegistry > * | textureRegistry
NSString * | isolateId
BOOL | isGpuDisabled
FlutterEngineProcTable & | embedderAPI
BOOL | enableEmbedderAPI

## Detailed Description

The deprecated FlutterHeadlessDartRunner runs Flutter Dart code with a null rasterizer, and no native drawing surface. It is appropriate for use in running Dart code e.g. in the background from a plugin.

Most callers should prefer using `FlutterEngine` directly; this interface exists for legacy support.

Definition at line 34 of file FlutterHeadlessDartRunner.h.

## Method Documentation

## ◆ init

- (instancetype) init |  |  |

Not recommended for use - will initialize with a default label ("io.flutter.headless") and the default FlutterDartProject.

Reimplemented from FlutterEngine.

Definition at line 57 of file FlutterHeadlessDartRunner.mm.

57 {
58 return [self initWithName:@"io.flutter.headless" project:nil];
59 }

References initWithName:project:.

## ◆ initWithName:project:

- (instancetype) initWithName: |  | (NSString*) | labelPrefix
project: |  | (FlutterDartProject*) | projectOrNil

Initialize this FlutterHeadlessDartRunner with a `FlutterDartProject`.

If the FlutterDartProject is not specified, the FlutterHeadlessDartRunner will attempt to locate the project in a default location.

A newly initialized engine will not run the `FlutterDartProject` until either `-runWithEntrypoint:` or `-runWithEntrypoint:libraryURI` is called.

Parameters

  labelPrefix | The label prefix used to identify threads for this instance. Should be unique across FlutterEngine instances
  projectOrNil | The `FlutterDartProject` to run.

Definition at line 30 of file FlutterHeadlessDartRunner.mm.

30 :(NSString*)labelPrefix project:(FlutterDartProject*)projectOrNil {
31 return [self initWithName:labelPrefix project:projectOrNil allowHeadlessExecution:YES];
32 }

References initWithName:project:allowHeadlessExecution:.

Referenced by init.

## ◆ initWithName:project:allowHeadlessExecution:

- (instancetype) initWithName: |  | (NSString*) | labelPrefix
project: |  | (FlutterDartProject*) | projectOrNil
allowHeadlessExecution: |  | (BOOL) | allowHeadlessExecution

Initialize this FlutterHeadlessDartRunner with a `FlutterDartProject`.

If the FlutterDartProject is not specified, the FlutterHeadlessDartRunner will attempt to locate the project in a default location.

A newly initialized engine will not run the `FlutterDartProject` until either `-runWithEntrypoint:` or `-runWithEntrypoint:libraryURI` is called.

Parameters

  labelPrefix | The label prefix used to identify threads for this instance. Should be unique across FlutterEngine instances
  projectOrNil | The `FlutterDartProject` to run.
  allowHeadlessExecution | Must be set to `YES`.

Definition at line 34 of file FlutterHeadlessDartRunner.mm.

34 :(NSString*)labelPrefix
35 project:(FlutterDartProject*)projectOrNil
36 allowHeadlessExecution:(BOOL)allowHeadlessExecution {
37 NSAssert(allowHeadlessExecution == YES,
38 @"Cannot initialize a FlutterHeadlessDartRunner without headless execution.");
39 return [self initWithName:labelPrefix
40 project:projectOrNil
41 allowHeadlessExecution:allowHeadlessExecution
42 restorationEnabled:NO];
43 }

References initWithName:project:allowHeadlessExecution:restorationEnabled:.

Referenced by initWithName:project:.

## ◆ initWithName:project:allowHeadlessExecution:restorationEnabled:

- (instancetype) initWithName: |  | (NSString*) | labelPrefix
project: |  | (FlutterDartProject*) | projectOrNil
allowHeadlessExecution: |  | (BOOL) | allowHeadlessExecution
restorationEnabled: |  | (BOOL) | NS_DESIGNATED_INITIALIZER

Initialize this FlutterHeadlessDartRunner with a `FlutterDartProject`.

If the FlutterDartProject is not specified, the FlutterHeadlessDartRunner will attempt to locate the project in a default location.

A newly initialized engine will not run the `FlutterDartProject` until either `-runWithEntrypoint:` or `-runWithEntrypoint:libraryURI` is called.

Parameters

  labelPrefix | The label prefix used to identify threads for this instance. Should be unique across FlutterEngine instances
  projectOrNil | The `FlutterDartProject` to run.
  allowHeadlessExecution | Must be set to `YES`.
  restorationEnabled | Must be set to `NO`.

Definition at line 45 of file FlutterHeadlessDartRunner.mm.

45 :(NSString*)labelPrefix
46 project:(FlutterDartProject*)projectOrNil
47 allowHeadlessExecution:(BOOL)allowHeadlessExecution
48 restorationEnabled:(BOOL)restorationEnabled {
49 NSAssert(allowHeadlessExecution == YES,
50 @"Cannot initialize a FlutterHeadlessDartRunner without headless execution.");
51 return [super initWithName:labelPrefix
52 project:projectOrNil
53 allowHeadlessExecution:allowHeadlessExecution
54 restorationEnabled:restorationEnabled];
55 }

References FlutterEngine::initWithName:project:allowHeadlessExecution:restorationEnabled:.

Referenced by initWithName:project:allowHeadlessExecution:.

The documentation for this class was generated from the following files:

- shell/platform/darwin/ios/framework/Headers/FlutterHeadlessDartRunner.h
- shell/platform/darwin/ios/framework/Source/FlutterHeadlessDartRunner.mm

FlutterDartProject
Definition: FlutterDartProject.mm:258