iOS开发 React Native与iOS交互汇总

RN简介

React Native 是一个使用React和应用平台的原生功能来构建 Android 和 iOS 应用的开源框架。起源于faceBbook内部，2013开源。

React Native 组件就是对原生视图的封装，因此使用 React Native 编写的应用外观、感觉和性能与其他任何原生应用一样。

RN坏境搭建

iOS必须安装的依赖有：Node、Watchman、Xcode 和 CocoaPods。

可以参考RN官网：https://reactnative.cn/docs/environment-setup

iOS 调用React Native

1,打开一个React Native页面

比如react-native init RNInteractionWithiOS 创建一个应用之后就会自动在 RNInteractionWithiOS->ios->RNInteractionWithiOS->AppDelegate.m中生成打开一个React Native页面的代码。核心代码如下：

NSURL *jsCodeLocation;

 jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];

 RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation

                                                     moduleName:@"RNInteractionWithiOS"

                                              initialProperties:nil

                                                  launchOptions:launchOptions];

 rootView.backgroundColor = [[UIColor alloc] initWithRed:1.0f green:1.0f blue:1.0f alpha:1];

 self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

 UIViewController *rootViewController = [UIViewController new];

 rootViewController.view = rootView;

 self.window.rootViewController = rootViewController;

 [self.window makeKeyAndVisible];

iOS调用RN(分是否传参数)

RN核心代码

componentWillMount() {

      DeviceEventEmitter.addListener('EventInit', (msg) => {

          let receive = "EventInit: " + msg;

          console.log(receive);

          this.setState({notice: receive});

      });

      DeviceEventEmitter.addListener('EventLogin', (msg) => {

          let receive = "EventLogin: " + msg;

          console.log(receive);

          this.setState({notice: receive});

      });

  }

iOS核心代码：

创建的iOS交互类要引用#import<React/RCTBridgeModule.h> 和#import <React/RCTEventEmitter.h>,继承RCTEventEmitter，并遵守RCTBridgeModule
很关键的：交互类要设置bridge为当前RCTRootView的bridge，[[ReactInteraction shareInstance] setValue:rnView.bridge forKey:@"bridge"];

ReactInteraction.h文件

#import <Foundation/Foundation.h>

#import <React/RCTBridgeModule.h>

#import <React/RCTEventEmitter.h>

@interface ReactInteraction : RCTEventEmitter <RCTBridgeModule>

+ (instancetype)shareInstance;

- (void)init:(NSString *)parameter;

- (void)login;

@end

ReactInteraction.m文件

#import "ReactInteraction.h"

#define INIT @"EventInit"

#define LOGIN @"EventLogin"

@implementation ReactInteraction

static ReactInteraction *instance = nil;

RCT_EXPORT_MODULE();

+ (instancetype)shareInstance {

  static dispatch_once_t onceToken;

  dispatch_once(&onceToken, ^{

    instance = [[self alloc] init];

  });

  return instance;

}

- (NSArray<NSString *> *)supportedEvents

{

  return @[INIT,LOGIN];

}

RCT_EXPORT_METHOD(init:(NSString *)msg) {

  [self.bridge enqueueJSCall:@"RCTDeviceEventEmitter"

                      method:@"emit"

                        args:@[INIT, msg]

                  completion:NULL];

}

RCT_EXPORT_METHOD(login) {

  [self.bridge enqueueJSCall:@"RCTDeviceEventEmitter"

                      method:@"emit"

                        args:@[LOGIN]

                  completion:NULL];

}

@end

React Native调用iOS

RN核心代码：

import {NativeModules} from 'react-native';

const NativeInteraction = NativeModules.NativeInteraction;

OS核心代码：
- 注意点1：RCT_EXPORT_METHOD与RCT_REMAP_METHOD宏定义的使用区别（个人总结，有不对请指正）
  - RCT_EXPORT_METHOD：用于仅有一个参数或回调
  - RCT_REMAP_METHOD：用于有多个参数或（和）多个回调
    
    （了解更多可以看RN宏定义源码1，下面贴出关键两句)
- 注意点2：iOS回调方式有两种
  - callback(@[jsonString]); ((RCTPromiseResolveBlock)resolver)
  - Promise方式：_resolveBlock(@[jsonString]); ((RCTResponseSenderBlock)callback) （了解更多看RN源码2）

源码1：

#define RCT_REMAP_METHOD(js_name, method) \

  _RCT_EXTERN_REMAP_METHOD(js_name, method, NO) \

  - (void)method RCT_DYNAMIC;

#define RCT_EXPORT_METHOD(method) \

  RCT_REMAP_METHOD(, method)

源码2

RCT_EXPORT_METHOD(navigate:(NSString*)page parameter:(NSDictionary *)dic callback:(RCTResponseSenderBlock )callback){

    //主线程处理UI事件

  dispatch_async(dispatch_get_main_queue(), ^{

      //跳转类型

    if ([page isEqualToString:@"ShoppingMall"]){

          //九九老年商城

          WeiMengWebVC *weiMengWebVC = [[WeiMengWebVC alloc] init];

          [dic setValue:@"1" forKey:@"type"];

          weiMengWebVC.dic = dic;

          [[UIViewController topViewController].navigationController pushViewController:weiMengWebVC animated:YES];

      }

}

typedef void (^RCTResponseSenderBlock)(NSArray *response);

typedef void (^RCTResponseErrorBlock)(NSError *error);

typedef void (^RCTPromiseResolveBlock)(id result);

typedef void (^RCTPromiseRejectBlock)(NSString *code, NSString *message, NSError *error

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