#import <FlutterViewController.h>

Inheritance diagram for FlutterViewController:

Instance Methods
(instancetype)	- initWithEngine:nibName:bundle:

(instancetype)	- initWithProject:nibName:bundle:

(instancetype)	- initWithProject:initialRoute:nibName:bundle:

(instancetype)	- initWithCoder:

(void)	- setFlutterViewDidRenderCallback:

(NSString *)	- lookupKeyForAsset:

(NSString *)	- lookupKeyForAsset:fromPackage:

(void)	- setInitialRoute:

(void)	- popRoute

(void)	- pushRoute:

(id< FlutterPluginRegistry >)	- pluginRegistry

(BOOL)	- loadDefaultSplashScreenView

Instance Methods inherited from <FlutterTextureRegistry>
(int64_t)	- registerTexture:

(void)	- textureFrameAvailable:

(void)	- unregisterTexture:

Instance Methods inherited from <FlutterPluginRegistry>
(nullable NSObject< FlutterPluginRegistrar > *)	- registrarForPlugin:

(BOOL)	- hasPlugin:

(nullable NSObject *)	- valuePublishedByPlugin:

Class Methods
(BOOL)	+ isUIAccessibilityIsVoiceOverRunning

Properties
BOOL	displayingFlutterUI

UIView *	splashScreenView

BOOL	viewOpaque

FlutterEngine *	engine

NSObject< FlutterBinaryMessenger > *	binaryMessenger

BOOL	engineAllowHeadlessExecution

Detailed Description

A UIViewController implementation for Flutter views.

Dart execution, channel communication, texture registration, and plugin registration are all handled by FlutterEngine. Calls on this class to those members all proxy through to the FlutterEngine attached FlutterViewController.

A FlutterViewController can be initialized either with an already-running FlutterEngine via the initWithEngine: initializer, or it can be initialized with a FlutterDartProject that will be used to implicitly spin up a new FlutterEngine. Creating a FlutterEngine before showing a FlutterViewController can be used to pre-initialize the Dart VM and to prepare the isolate in order to reduce the latency to the first rendered frame. See https://flutter.dev/docs/development/add-to-app/performance for more details on loading latency.

Holding a FlutterEngine independently of FlutterViewControllers can also be used to not to lose Dart-related state and asynchronous tasks when navigating back and forth between a FlutterViewController and other UIViewControllers.

Definition at line 57 of file FlutterViewController.h.

Method Documentation

◆ initWithCoder:

- (instancetype) initWithCoder: (NSCoder*) NS_DESIGNATED_INITIALIZER

Initializer that is called from loading a FlutterViewController from a XIB.

Definition at line 218 of file FlutterViewController.mm.

                              :(NSCoder*)aDecoder {
   self = [super initWithCoder:aDecoder];
   return self;
 }

◆ initWithEngine:nibName:bundle:

- (instancetype) initWithEngine:	(FlutterEngine*)	engine
nibName:	(nullable NSString*)	nibName
bundle:	(nullable NSBundle*)	NS_DESIGNATED_INITIALIZER

Initializes this FlutterViewController with the specified FlutterEngine.

The initialized viewcontroller will attach itself to the engine as part of this process.

Parameters

engine	The `FlutterEngine` instance to attach to. Cannot be nil.
nibName	The NIB name to initialize this UIViewController with.
nibBundle	The NIB bundle.

Definition at line 161 of file FlutterViewController.mm.

                               :(FlutterEngine*)engine
                        nibName:(nullable NSString*)nibName
                         bundle:(nullable NSBundle*)nibBundle {
   NSAssert(engine != nil, @"Engine is required");
   self = [super initWithNibName:nibName bundle:nibBundle];
   if (self) {
     _viewOpaque = YES;
     if (engine.viewController) {
       FML_LOG(ERROR) << "The supplied FlutterEngine " << [[engine description] UTF8String]
                      << " is already used with FlutterViewController instance "
                      << [[engine.viewController description] UTF8String]
                      << ". One instance of the FlutterEngine can only be attached to one "
                         "FlutterViewController at a time. Set FlutterEngine.viewController "
                         "to nil before attaching it to another FlutterViewController.";
     }
     _engine.reset([engine retain]);
     _engineNeedsLaunch = NO;
     _flutterView.reset([[FlutterView alloc] initWithDelegate:_engine
                                                       opaque:self.isViewOpaque
                                              enableWideGamut:engine.project.isWideGamutEnabled]);
     _weakFactory = std::make_unique<fml::WeakNSObjectFactory<FlutterViewController>>(self);
     _ongoingTouches.reset([[NSMutableSet alloc] init]);
  
     [self performCommonViewControllerInitialization];
     [engine setViewController:self];
   }
  
   return self;
 }

References _engine, _engineNeedsLaunch, _flutterView, _ongoingTouches, _viewOpaque, _weakFactory, and engine.

◆ initWithProject:initialRoute:nibName:bundle:

- (instancetype) initWithProject:	(nullable FlutterDartProject *)	project
initialRoute:	(nullable NSString *)	initialRoute
nibName:	(nullable NSString *)	nibName
bundle:	(nullable NSBundle *)	NS_DESIGNATED_INITIALIZER

Initializes a new FlutterViewController and FlutterEngine with the specified FlutterDartProject and initialRoute.

This will implicitly create a new FlutterEngine which is retrievable via the engine property after initialization.

Parameters

project	The `FlutterDartProject` to initialize the `FlutterEngine` with.
initialRoute	The initial `Navigator` route to load.
nibName	The NIB name to initialize this UIViewController with.
nibBundle	The NIB bundle.

◆ initWithProject:nibName:bundle:

- (instancetype) initWithProject:	(nullable FlutterDartProject *)	project
nibName:	(nullable NSString *)	nibName
bundle:	(nullable NSBundle *)	NS_DESIGNATED_INITIALIZER

Initializes a new FlutterViewController and FlutterEngine with the specified FlutterDartProject.

This will implicitly create a new FlutterEngine which is retrievable via the engine property after initialization.

Parameters

project	The `FlutterDartProject` to initialize the `FlutterEngine` with.
nibName	The NIB name to initialize this UIViewController with.
nibBundle	The NIB bundle.

◆ isUIAccessibilityIsVoiceOverRunning

+ (BOOL) isUIAccessibilityIsVoiceOverRunning

A wrapper around UIAccessibilityIsVoiceOverRunning().

As a C function, UIAccessibilityIsVoiceOverRunning() cannot be mocked in testing. Mock this class method to testing features depends on UIAccessibilityIsVoiceOverRunning().

Definition at line 2379 of file FlutterViewController.mm.

                                             {
   return UIAccessibilityIsVoiceOverRunning();
 }

◆ loadDefaultSplashScreenView

- (BOOL) loadDefaultSplashScreenView

Attempts to set the splashScreenView property from the UILaunchStoryboardName from the main bundle's Info.plist file. This method will not change the value of splashScreenView if it cannot find a default one from a storyboard or nib.

Returns: YES if successful, NO otherwise.

Definition at line 673 of file FlutterViewController.mm.

                                     {
   NSString* launchscreenName =
       [[[NSBundle mainBundle] infoDictionary] objectForKey:@"UILaunchStoryboardName"];
   if (launchscreenName == nil) {
     return NO;
   }
   UIView* splashView = [self splashScreenFromStoryboard:launchscreenName];
   if (!splashView) {
     splashView = [self splashScreenFromXib:launchscreenName];
   }
   if (!splashView) {
     return NO;
   }
   self.splashScreenView = splashView;
   return YES;
 }

◆ lookupKeyForAsset:

- (NSString *) lookupKeyForAsset: (NSString*) asset

Returns the file name for the given asset. The returned file name can be used to access the asset in the application's main bundle.

Parameters

asset The name of the asset. The name can be hierarchical.

Returns: The file name to be used for lookup in the main bundle.

Definition at line 2367 of file FlutterViewController.mm.

                               :(NSString*)asset {
   return [FlutterDartProject lookupKeyForAsset:asset];
 }

References FlutterDartProject::lookupKeyForAsset:.

◆ lookupKeyForAsset:fromPackage:

- (NSString *) lookupKeyForAsset:	(NSString*)	asset
fromPackage:	(NSString*)	package

Returns the file name for the given asset which originates from the specified package. The returned file name can be used to access the asset in the application's main bundle.

Parameters

asset	The name of the asset. The name can be hierarchical.
package	The name of the package from which the asset originates.

Returns: The file name to be used for lookup in the main bundle.

Definition at line 2371 of file FlutterViewController.mm.

                               :(NSString*)asset fromPackage:(NSString*)package {
   return [FlutterDartProject lookupKeyForAsset:asset fromPackage:package];
 }

References FlutterDartProject::lookupKeyForAsset:fromPackage:.

◆ pluginRegistry

- (id< FlutterPluginRegistry >) pluginRegistry

The FlutterPluginRegistry used by this FlutterViewController.

Definition at line 2375 of file FlutterViewController.mm.

                                             {
   return _engine;
 }

References _engine.

◆ popRoute

- (void) popRoute

Instructs the Flutter Navigator (if any) to go back.

Definition at line 453 of file FlutterViewController.mm.

                  {
   [[_engine.get() navigationChannel] invokeMethod:@"popRoute" arguments:nil];
 }

◆ pushRoute:

- (void) pushRoute: (NSString*) route

Instructs the Flutter Navigator (if any) to push a route on to the navigation stack.

Parameters

route The name of the route to push to the navigation stack.

Definition at line 457 of file FlutterViewController.mm.

                  :(NSString*)route {
   [[_engine.get() navigationChannel] invokeMethod:@"pushRoute" arguments:route];
 }

◆ setFlutterViewDidRenderCallback:

- (void) setFlutterViewDidRenderCallback: (void(^)(void)) callback

Registers a callback that will be invoked when the Flutter view has been rendered. The callback will be fired only once.

Replaces an existing callback. Use a nil callback to unregister the existing one.

Definition at line 732 of file FlutterViewController.mm.

                                        :(void (^)(void))callback {
   _flutterViewRenderedCallback.reset(callback, fml::scoped_policy::OwnershipPolicy::kRetain);
 }

References _flutterViewRenderedCallback.

◆ setInitialRoute:

- (void) setInitialRoute: ("Use FlutterViewController initializer to specify initial route") FLUTTER_DEPRECATED

Deprecated API to set initial route.

Attempts to set the first route that the Flutter app shows if the Flutter runtime hasn't yet started. The default is "/".

This method must be called immediately after initWithProject and has no effect when using initWithEngine if the FlutterEngine has already been run.

Setting this after the Flutter started running has no effect. See pushRoute and popRoute to change the route after Flutter started running.

This is deprecated because it needs to be called at the time of initialization and thus should just be in the initWithProject initializer. If using initWithEngine, the initial route should be set on the engine's initializer.

Parameters

route The name of the first route to show.

Property Documentation

◆ binaryMessenger

- (NSObject< FlutterBinaryMessenger > *) binaryMessenger

readnonatomicassign

The FlutterBinaryMessenger associated with this FlutterViewController (used for communicating with channels).

This is just a convenient way to get the |FlutterEngine|'s binary messenger.

Definition at line 244 of file FlutterViewController.h.

◆ displayingFlutterUI

- (BOOL) displayingFlutterUI

readnonatomicassign

True if at least one frame has rendered and the ViewController has appeared.

This property is reset to false when the ViewController disappears. It is guaranteed to only alternate between true and false for observers.

Definition at line 198 of file FlutterViewController.h.

◆ engine

- (FlutterEngine *) engine

readnonatomicweak

The FlutterEngine instance for this view controller. This could be the engine this FlutterViewController is initialized with or a new FlutterEngine implicitly created if no engine was supplied during initialization.

Definition at line 236 of file FlutterViewController.h.

◆ engineAllowHeadlessExecution

- (BOOL) engineAllowHeadlessExecution

readnonatomicassign

If the FlutterViewController creates a FlutterEngine, this property determines if that FlutterEngine has allowHeadlessExecution set.

The intention is that this is used with the XIB. Otherwise, a FlutterEngine can just be sent to the init methods.

See also: -[FlutterEngine initWithName:project:allowHeadlessExecution:]

Definition at line 255 of file FlutterViewController.h.

◆ splashScreenView

- (UIView *) splashScreenView

readwritenonatomicstrong

Specifies the view to use as a splash screen. Flutter's rendering is asynchronous, so the first frame rendered by the Flutter application might not immediately appear when the Flutter view is initially placed in the view hierarchy. The splash screen view will be used as a replacement until the first frame is rendered.

The view used should be appropriate for multiple sizes; an autoresizing mask to have a flexible width and height will be applied automatically.

Set to nil to remove the splash screen view.

Definition at line 211 of file FlutterViewController.h.

◆ viewOpaque

- (BOOL) viewOpaque

readwritenonatomicassign

Controls whether the created view will be opaque or not.

Default is YES. Note that setting this to NO may negatively impact performance when using hardware acceleration, and toggling this will trigger a re-layout of the view.

Definition at line 229 of file FlutterViewController.h.

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

shell/platform/darwin/ios/framework/Headers/FlutterViewController.h
shell/platform/darwin/ios/framework/Source/FlutterViewController.mm

Instance Methods

Class Methods

Properties

Detailed Description

Method Documentation

◆ initWithCoder:

◆ initWithEngine:nibName:bundle:

◆ initWithProject:initialRoute:nibName:bundle:

◆ initWithProject:nibName:bundle:

◆ isUIAccessibilityIsVoiceOverRunning

◆ loadDefaultSplashScreenView

◆ lookupKeyForAsset:

◆ lookupKeyForAsset:fromPackage:

◆ pluginRegistry

◆ popRoute

◆ pushRoute:

◆ setFlutterViewDidRenderCallback:

◆ setInitialRoute:

Property Documentation

◆ binaryMessenger

◆ displayingFlutterUI

◆ engine

◆ engineAllowHeadlessExecution

◆ splashScreenView

◆ viewOpaque