小编hph*_*p95的帖子

我最近一直在阅读openCV及其cv::Mat数据结构.在文档中,作者不断提到多通道阵列和多通道矩阵.有人可以给我一个这两个的定义,什么是"渠道"？我试图在谷歌上找到但没有发现类似的东西.

我正在尝试在 Swift 中为 React Native 实现一个事件发射器，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.

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

在 Swift 中的实现：

/// 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

在我的原生 swift 代码中，我通过以下方式初始化了发射器

import Foundation

@objc(MyEventEmitter)
class MyEventEmitter: RCTEventEmitter {

    public static let shared …