iOS原生和React-Native之间的交互1

今天,记录一下iOS原生和React-Native之间的交互.如果第一次接触最好先移步至 http://www.cnblogs.com/shaoting/p/6388502.html 先看一下怎么在iOS原生中集成react-native模块.

iOS原生和React-Native之间的交互主要通过NativeModules实现.

先看RN->iOS原生

开发环境版本:

准备:

终端新建一个react-native项目或者使用上一篇文章建立的demo.

a.先使用Xcode打开,新建一个CalendarManager类,集成自NSObject即可.先在CalendarManager.h中导入相关类和实现协议RCTBridgeModule

 //
 //  CalendarManager.h
 //  rnAndN
 //
 //  Created by Shaoting Zhou on 2017/2/10.
 //  Copyright © 2017年 Facebook. All rights reserved.
 //

 #import <Foundation/Foundation.h>
 #import <React/RCTBridgeModule.h>
 #import <React/RCTLog.h>
 @interface CalendarManager : NSObject<RCTBridgeModule>

 @end

b.CalendarManager.m配置,为了实现该协议,需要含有一个宏:RCT_EXPORT_MODULE(),

 //
 //  CalendarManager.m
 //  rnAndN
 //
 //  Created by Shaoting Zhou on 2017/2/10.
 //  Copyright © 2017年 Facebook. All rights reserved.
 //

 #import "CalendarManager.h"

 @implementation CalendarManager

 RCT_EXPORT_MODULE();

c.react-native 通过NativeModules来实现传输和接受消息:

  import {
     AppRegistry,
      StyleSheet,
     Text,
     View,
    NativeModules
   } from 'react-native';
  var CalendarManager = NativeModules.CalendarManager;

1.基本调用:

CalendarManager.m

// 接收传过来的 NSString
RCT_EXPORT_METHOD(addEventOne:(NSString *)name){
  NSLog(@"接收传过来的NSString+NSString: %@", name);
}

RN:

CalendarManager.addEventOne('周少停');

2.字符串+字典:

CalendarManager.m

 // 接收传过来的 NSString + NSDictionary
 RCT_EXPORT_METHOD(addEventTwo:(NSString *)name details:(NSDictionary *)details)
 {
   RCTLogInfo(@"接收传过来的NSString+NSDictionary: %@ %@", name, details);
 }

RN:

 CalendarManager.addEventTwo('周少停',{job:'programmer'});

3.字符串+日期:

CalendarManager.m

 // 接收传过来的 NSString + date日期
 RCT_EXPORT_METHOD(addEventThree:(NSString *)name date:(NSDate *)date)
 {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init] ;
    [formatter setDateFormat:@"yyyy-MM-dd"];
   RCTLogInfo(@"接收传过来的NSString+NSDictionary: %@ %@", name, [formatter stringFromDate:date]);
 }

RN:

CalendarManager.addEventThree('周少停',19910730);

4.点击调原生+回调

CalendarManager.m

 //  对外提供调用方法,演示Callback
 RCT_EXPORT_METHOD(testCallbackEventOne:(NSString *)name callback:(RCTResponseSenderBlock)callback)
 {
   NSLog(@"%@",name);
   NSArray *events=@[@"1", @"2", @"3",@"4"]; //准备回调回去的数据
   callback(@[[NSNull null],events]);
 }

RN:

     // 传原生一个字符串 + 回调
     callBackOne = ()=>{
         CalendarManager.testCallbackEventOne(('我是RN给原生的'),(error, events) => {
             if (error) {
                 console.error(error);
             } else {
                 alert(events)
             }
         })
     }

5.Promises

CalendarManager.m

//Promises
//  对外提供调用方法,演示Promise使用
RCT_REMAP_METHOD(testCallbackEventTwo,
                 resolver:(RCTPromiseResolveBlock)resolve
                 rejecter:(RCTPromiseRejectBlock)reject)
{
  NSArray *events =@[@"one ",@"two ",@"three"];//准备回调回去的数据
  if (events) {
    resolve(events);
  } else {
    NSError *error=[NSError errorWithDomain:@"我是Promise回调错误信息..." code:101 userInfo:nil];
    reject(@"no_events", @"There were no events", error);
  }
}

RN:

try{
            var events=await CalendarManager.testCallbackEventTwo();
            alert(events)
        }catch(e){
            console.error(e);
        }

5.使用原生定义的常量

CalendarManager.m

 - (NSDictionary *)constantsToExport
 {
   return @{ @"ValueOne": @"我是从原生定义的~" };
 }

RN:

alert(CalendarManager.ValueOne)

完整代码:

CalendarManager.m

 //
 //  CalendarManager.m
 //  rnAndN
 //
 //  Created by Shaoting Zhou on 2017/2/10.
 //  Copyright © 2017年 Facebook. All rights reserved.
 //

 #import "CalendarManager.h"

 @implementation CalendarManager

 RCT_EXPORT_MODULE();

 // 接收传过来的 NSString
 RCT_EXPORT_METHOD(addEventOne:(NSString *)name){
   NSLog(@"接收传过来的NSString+NSString: %@", name);
 }
 // 接收传过来的 NSString + NSDictionary
 RCT_EXPORT_METHOD(addEventTwo:(NSString *)name details:(NSDictionary *)details)
 {
   RCTLogInfo(@"接收传过来的NSString+NSDictionary: %@ %@", name, details);
 }

 // 接收传过来的 NSString + date日期
 RCT_EXPORT_METHOD(addEventThree:(NSString *)name date:(NSDate *)date)
 {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init] ;
    [formatter setDateFormat:@"yyyy-MM-dd"];
   RCTLogInfo(@"接收传过来的NSString+NSDictionary: %@ %@", name, [formatter stringFromDate:date]);
 }

 //  对外提供调用方法,演示Callback
 RCT_EXPORT_METHOD(testCallbackEventOne:(NSString *)name callback:(RCTResponseSenderBlock)callback)
 {
   NSLog(@"%@",name);
   NSArray *events=@[@"1", @"2", @"3",@"4"]; //准备回调回去的数据
   callback(@[[NSNull null],events]);
 }

 //Promises
 //  对外提供调用方法,演示Promise使用
 RCT_REMAP_METHOD(testCallbackEventTwo,
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
 {
   NSArray *events =@[@"one ",@"two ",@"three"];//准备回调回去的数据
   if (events) {
     resolve(events);
   } else {
     NSError *error=[NSError errorWithDomain:@"我是Promise回调错误信息..." code:101 userInfo:nil];
     reject(@"no_events", @"There were no events", error);
   }
 }

 - (NSDictionary *)constantsToExport
 {
   return @{ @"ValueOne": @"我是从原生定义的~" };
 }

 @end

RN:

 /**
  * Sample React Native App
  * https://github.com/facebook/react-native
  * @flow
  */

 import React, { Component } from 'react';
 import {
     AppRegistry,
     StyleSheet,
     Text,
     View,
     NativeModules
 } from 'react-native';
 var CalendarManager = NativeModules.CalendarManager;

 export default class NativeAddRN extends Component {
     render() {
         return (
             <View style={styles.container}>
               <Text style={styles.welcome} onPress={()=>this.passValueToNativeOne()}>点击往原生传字符串</Text>
               <Text style={styles.welcome} onPress={()=>this.passValueToNativeTwo()}>点击往原生传字符串+字典</Text>
               <Text style={styles.welcome} onPress={()=>this.passValueToNativeThree()}>点击往原生传字符串+日期</Text>
               <Text style={styles.welcome} onPress={()=>this.callBackOne()}>点击调原生+回调</Text>
               <Text style={styles.welcome} onPress={()=>this.callBackTwo()}>Promises</Text>
               <Text style={styles.welcome} onPress={()=>this.useNativeValue()}>使用原生定义的常量</Text>
             </View>
         );
     }
     // 传原生一个字符串
     passValueToNativeOne = ()=>{
         CalendarManager.addEventOne('周少停');
     }
     // 传原生一个字符串 + 字典
     passValueToNativeTwo = ()=>{
         CalendarManager.addEventTwo('周少停',{job:'programmer'});
     }
     // 传原生一个字符串 + 日期
     passValueToNativeThree = ()=>{
         CalendarManager.addEventThree('周少停',19910730);
     }
     // 传原生一个字符串 + 回调
     callBackOne = ()=>{
         CalendarManager.testCallbackEventOne(('我是RN给原生的'),(error, events) => {
             if (error) {
                 console.error(error);
             } else {
                 alert(events)
             }
         })
     }
     //Promise回调
     async callBackTwo(){
         try{
             var events=await CalendarManager.testCallbackEventTwo();
             alert(events)
         }catch(e){
             console.error(e);
         }
     }
     //使用原生定义的常量
     useNativeValue = ()=>{
         alert(CalendarManager.ValueOne)
     }

 }

 const styles = StyleSheet.create({
     container: {
         flex: 1,
         marginTop:100
     },
     welcome: {
         fontSize: 20,
         textAlign: 'center',
         margin: 10,
     },
     instructions: {
         textAlign: 'center',
         color: '#333333',
         marginBottom: 5,
     },
 });

 AppRegistry.registerComponent('NativeAddRN', () => NativeAddRN);

演示效果和demo源码:https://github.com/pheromone/IOS-native-and-React-native-interaction

另:因为react native并不提供清除缓存功能,所以只能通过react native调用原生来实现计算缓存大小和清除缓存功能:

iOS:

 //
 //  CalendarManager.m
 //  rnAndN
 //
 //  Created by Shaoting Zhou on 2017/2/10.
 //  Copyright © 2017年 Facebook. All rights reserved.
 //

 #import "CalendarManager.h"
 @implementation CalendarManager

 RCT_EXPORT_MODULE();

 //  清理缓存
 RCT_EXPORT_METHOD(cleanCache:(RCTResponseSenderBlock)callback)
 {
   NSURLCache *httpCache = [NSURLCache sharedURLCache];
   [httpCache removeAllCachedResponses];
   NSUInteger cache = [httpCache currentDiskUsage];
   callback(@[[NSNull null],@(cache)]);
 }
 // 计算缓存
  RCT_EXPORT_METHOD(cacheSize:(RCTResponseSenderBlock)callback)
  {
    NSURLCache *httpCache = [NSURLCache sharedURLCache];
    NSUInteger cache = [httpCache currentDiskUsage];
    callback(@[[NSNull null],@(cache)]);
  }
 @end

RN:

再进入清除缓存界面时,就计算缓存大小:

     componentWillMount() {
         CalendarManager.cacheSize((error, events) => {
             if (error) {
                 console.error(error);
             } else {
                 this.setState({
                     cache:Math.round(events/1024)   //缓存大小
                 })
             }
         })
     }

清除缓存按钮响应时间:

     clearRom  =()=>{
         CalendarManager.cleanCache((error, events) => {
             if (error) {
                 console.error(error);
             } else {
                 this.setState({
                     cache:0  //这里本应该是清除之后的数据Math.round(events/1024).应该是0才对,但是总是清不干净,我就直接置为0了
                 })
             }
         })
     }

iOS清除缓存源码可以参考该微博项目中的:https://github.com/pheromone/react_native_weibo

安卓待写....