FlutterMethodChannel

@interface FlutterMethodChannel : NSObject

A channel for communicating with the Flutter side using invocation of asynchronous methods.

  • Creates a FlutterMethodChannel with the specified name and binary messenger.

    The channel name logically identifies the channel; identically named channels interfere with each other’s communication.

    The binary messenger is a facility for sending raw, binary messages to the Flutter side. This protocol is implemented by FlutterEngine and FlutterViewController.

    The channel uses FlutterStandardMethodCodec to encode and decode method calls and result envelopes.

    Declaration

    Objective-C

    + (nonnull instancetype)
        methodChannelWithName:(nonnull NSString *)name
              binaryMessenger:(nonnull NSObject<FlutterBinaryMessenger> *)messenger;

    Parameters

    name

    The channel name.

    messenger

    The binary messenger.

  • Creates a FlutterMethodChannel with the specified name, binary messenger, and method codec.

    The channel name logically identifies the channel; identically named channels interfere with each other’s communication.

    The binary messenger is a facility for sending raw, binary messages to the Flutter side. This protocol is implemented by FlutterEngine and FlutterViewController.

    Declaration

    Objective-C

    + (nonnull instancetype)
        methodChannelWithName:(nonnull NSString *)name
              binaryMessenger:(nonnull NSObject<FlutterBinaryMessenger> *)messenger
                        codec:(nonnull NSObject<FlutterMethodCodec> *)codec;

    Parameters

    name

    The channel name.

    messenger

    The binary messenger.

    codec

    The method codec.

  • Initializes a FlutterMethodChannel with the specified name, binary messenger, and method codec.

    The channel name logically identifies the channel; identically named channels interfere with each other’s communication.

    The binary messenger is a facility for sending raw, binary messages to the Flutter side. This protocol is implemented by FlutterEngine and FlutterViewController.

    Declaration

    Objective-C

    - (nonnull instancetype)
           initWithName:(nonnull NSString *)name
        binaryMessenger:(nonnull NSObject<FlutterBinaryMessenger> *)messenger
                  codec:(nonnull NSObject<FlutterMethodCodec> *)codec;

    Parameters

    name

    The channel name.

    messenger

    The binary messenger.

    codec

    The method codec.

  • Invokes the specified Flutter method with the specified arguments, expecting no results.

    Declaration

    Objective-C

    - (void)invokeMethod:(nonnull NSString *)method
               arguments:(id _Nullable)arguments;

    Parameters

    method

    The name of the method to invoke.

    arguments

    The arguments. Must be a value supported by the codec of this channel.

  • Invokes the specified Flutter method with the specified arguments, expecting an asynchronous result.

    Declaration

    Objective-C

    - (void)invokeMethod:(nonnull NSString *)method
               arguments:(id _Nullable)arguments
                  result:(FlutterResult _Nullable)callback;

    Parameters

    method

    The name of the method to invoke.

    arguments

    The arguments. Must be a value supported by the codec of this channel.

    callback

    A callback that will be invoked with the asynchronous result. The result will be a FlutterError instance, if the method call resulted in an error on the Flutter side. Will be FlutterMethodNotImplemented, if the method called was not implemented on the Flutter side. Any other value, including nil, should be interpreted as successful results.

  • Registers a handler for method calls from the Flutter side.

    Replaces any existing handler. Use a nil handler for unregistering the existing handler.

    Declaration

    Objective-C

    - (void)setMethodCallHandler:(FlutterMethodCallHandler _Nullable)handler;

    Parameters

    handler

    The method call handler.