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<FlutterPluginRegistry> Protocol Reference

`#import <FlutterPlugin.h>`

Inheritance diagram for <FlutterPluginRegistry>:

## Instance Methods
(nullable NSObject< FlutterPluginRegistrar > *) | - registrarForPlugin:
(BOOL) | - hasPlugin:
(nullable NSObject *) | - valuePublishedByPlugin:

## Detailed Description

A registry of Flutter iOS plugins.

Plugins are identified by unique string keys, typically the name of the plugin's main class. The registry tracks plugins by this key, mapping it to a value published by the plugin during registration, if any. This provides a very basic means of cross-plugin coordination with loose coupling between unrelated plugins.

Plugins typically need contextual information and the ability to register callbacks for various application events. To keep the API of the registry focused, these facilities are not provided directly by the registry, but by a `FlutterPluginRegistrar`, created by the registry in exchange for the unique key of the plugin.

There is no implied connection between the registry and the registrar. Specifically, callbacks registered by the plugin via the registrar may be relayed directly to the underlying iOS application objects.

Definition at line 402 of file FlutterPlugin.h.

## Method Documentation

## ◆ hasPlugin:

- (BOOL) hasPlugin: |  | (NSString *) | pluginKey |

Returns whether the specified plugin has been registered.

Parameters

  pluginKey | The unique key identifying the plugin.

Returns
  `YES` if `registrarForPlugin` has been called with `pluginKey`.

## ◆ registrarForPlugin:

- (nullable NSObject<FlutterPluginRegistrar>*) registrarForPlugin: |  | (NSString *) | pluginKey |

Returns a registrar for registering a plugin.

Parameters

  pluginKey | The unique key identifying the plugin.

## ◆ valuePublishedByPlugin:

- (nullable NSObject*) valuePublishedByPlugin: |  | (NSString *) | pluginKey |

Returns a value published by the specified plugin.

Parameters

  pluginKey | The unique key identifying the plugin.

Returns
  An object published by the plugin, if any. Will be `NSNull` if nothing has been published. Will be `nil` if the plugin has not been registered.

The documentation for this protocol was generated from the following file:

- shell/platform/darwin/ios/framework/Headers/FlutterPlugin.h