在 Swift 中实现 RCTEventEmitter 但未设置桥接收异常

我正在尝试在 Swift 中实现 React Native 的事件发射器，以便我可以在我的一些本机模块中重用它。但是，当我从 iOS 本地发送事件时，收到以下错误

Bridge is not set. This is probably because you've explicitly synthesized the bridge in MyEventEmitter, even though it's inherited from RCTEventEmitter.

/// MyEventEmitter.m
#import <Foundation/Foundation.h>
#import <React/RCTBridgeModule.h>
#import <React/RCTEventEmitter.h>

@interface RCT_EXTERN_MODULE(MyEventEmitter, RCTEventEmitter)

RCT_EXTERN_METHOD(supportedEvents)

@end

Swift 中的实现：

import Foundation

@objc(MyEventEmitter)
class MyEventEmitter: RCTEventEmitter {

    public static let shared = MyEventEmitter()

    override func supportedEvents() -> [String]! {
        return [
            ... // my event list
        ]
    }
}

在我的本机 swift 代码中，我通过以下方式初始化了发射器

private let eventEmitter: MyEventEmitter = .shared

// send event
self.eventEmitter.sendEvent(withName: "someEvent", body: nil)

我也把<React/RCTBridgeModule.h> and <React/RCTEventEmitter.h>在我的桥接头内。

我在这里做错了什么？

我发现的问题是你不能实例化MyEventEmitter你自己又名在public static let shared = MyEventEmitter()

你应该覆盖init方法和分配self to shared

import Foundation

@objc(MyEventEmitter)
class MyEventEmitter: RCTEventEmitter {

    public static var shared:MyEventEmitter?

    override init() {
        super.init()
        MyEventEmitter.shared = self
    }

    override func supportedEvents() -> [String]! {
        return [
            ... // my event list
        ]
    }
}

这是因为 RN 已经实例化了对象本身并分配了桥，而当您自己执行此操作时，桥将不会被分配。