我在 JS 中看不到任何 iOS 本机模块 [英] I can't see any iOS Native Module in JS

问题描述

我对 React 有一些经验，但我是 React Native 的新手.我已经玩了一段时间了，但是当我尝试为 iOS 编写一个基本的本机模块时我卡住了.我尝试过 Swift 和 Objective C.(我对 Swift 有一些基本的经验，但 Objective C 对我来说是全新的)

I have some experience with React but I'm new to React Native. I've played around for a while, but I got stuck when I tried to write a basic native module for iOS. I've tried with both Swift and Objective C. (I have some basic experience with Swift, but Objective C is completely new for me)

一些上下文:

1. 该项目是使用 react-native-cli 2.0.1
创建的
2. 我使用 XCode 9.1

这里是 .swift 类

Here is the .swift class

import Foundation

@objc(Something)
class Something: NSObject {

  @objc
  func printSomething() -> Void {
    print("Something")
  }
}

这是桥文件

#import <Foundation/Foundation.h>
#import <React/RCTBridgeModule.h>

@interface RCT_EXTERN_MODULE(Something, NSObject)

RCT_EXTERN_METHOD(printSomething)

@end

和 Project-Brigding-Header.h

And the Project-Brigding-Header.h

//
//  Use this file to import your target's public headers that you would like to expose to Swift.
//

#import <React/RCTBridgeModule.h>

我的 App.js 文件

My App.js file

...
import { NativeModules } from 'react-native';
...
type Props = {};
export default class App extends Component<Props> {
  componentDidMount() {
    console.log('NativeModules: ', NativeModules);
  }
...
}

问题来了.console.log() 的输出表明 NativeModules 是一个空对象:

Here is the problem. The output of console.log() says NativeModules is an empty object:

2018-02-22 18:19:04.590 [info][tid:com.facebook.react.JavaScript] 'NativeModules', {}
2018-02-22 18:19:04.589970+0200 velimo_app_rn[14748:400982] 'NativeModules', {}

我不明白我做错了什么.我已经阅读了几乎所有我能找到的仅与该主题相关的内容，但我看不出我做错了什么.如果您有任何建议，请告诉我.谢谢！

I don't understand what I'm doing wrong. I've read pretty much everything I could find only related to the topic but I can't see what I do wrong. If you have any suggestion, please let me know. Thanks!

推荐答案

解决方案是记录模块名称 console.log(NativeModules.Something)，而不是整个 NativeModules 对象.我的设置没有任何问题.

The solution was to log the module name console.log(NativeModules.Something), not the whole NativeModules object. It wasn't anything wrong with my setup.

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