iOS端实现React Native差异化增量更新

扯会淡

RN具有的优势有很多(虽然坑更多,一代版本一筐坑),跨平台开发,一套代码Android和iOS通用,热更新,不用一直等苹果爸爸慢吞吞的审核流程,既然要做RN,那么RN的热更新部署肯定得学下,今天就总结一下一个刚学RN的小白对热更新的理解。

个人理解,RN的热更新有点类似App的版本更新,app内版本号与server端匹配,来判断是否要更新,替换加载的jsbundle文件,然后加载新的jsbundle文件来实现版本更新,那么实质上就是把app内要加载的jsbundle文件替换掉就OK了。

原理分析

自己整理的原理图.png

react-native打ios离线包

  • 打包命令说明
react-native bundle
Options:
--entry-file           Path to the root JS file, either absolute or relative to JS root
(一般为index.js文件)
--platform [string]          Either "ios" or "android"
(RN入口文件的路径, 绝对路径或相对路径)
--transformer [string]       Specify a custom transformer to be used

--dev [boolean]              If false, warnings are disabled and the bundle is minified
(如果为false, 警告会不显示并且打出的包的大小会变小,默认为--dev true)
--prepack                    When passed, the output bundle will use the Prepack format.
(当通过时, 打包输出将使用Prepack格式化,默认为--prepack  false)
--bridge-config [string]     File name of a a JSON export of __fbBatchedBridgeConfig. Used by Prepack. Ex. ./bridgeconfig.json
(使用Prepack的一个json格式的文件__fbBatchedBridgeConfig 例如: ./bridgeconfig.json)
 --bundle-output      File name where to store the resulting bundle, ex. /tmp/groups.bundle
(打包后的文件输出目录, 例: /tmp/groups.bundle)
--bundle-encoding [string]   Encoding the bundle should be written in (https://nodejs.org/api/buffer.html#buffer_buffer).[default: "utf8"]
(打离线包的格式 可参考链接https://nodejs.org/api/buffer.html#buffer_buffer.默认为utf-8格式)
---sourcemap-output [string]  File name where to store the sourcemap file for resulting bundle, ex. /tmp/groups.map
(生成Source Map,但0.14之后不再自动生成source map,需要手动指定这个参数。例: /tmp/groups.map)
--assets-dest [string]       Directory name where to store assets referenced in the bundle
(打包时图片资源的存储路径)
--verbose                    Enables logging
(显示打包过程)
--reset-cache                Removes cached files
(移除缓存文件)
--config [string]            Path to the CLI configuration file
(命令行的配置文件路径)
  • 具体操作
    1.cd [项目路径]
    2.在react-native根目录下的ios目录下新建bundle文件夹(mkdir ./ios/bundle)(注意:输入打包命令前必须先新建bundle文件夹)
    3.打包命令:react-native bundle --entry-file index.js --platform ios --dev false --bundle-output ./ios/bundle/index.ios.jsbundle --assets-dest ./ios/bundle/
    4.结果展示


    生成的jsbundle离线包

    一般为下面这种


    生成的jsbundle离线包

patches.pad差异化文件终端生成方案

利用google的diff文件(资料查出来,这个比较受欢迎,同时也兼容Objective-C),github地址:https://github.com/google/dif...

  • $ git clone https://github.com/LiuC520/no...
  • $ cd nodediffpatch && npm i
  • $ sudo npm link
  • 把新旧文件放入nodediffpatch/patch目录下


    新旧离线包
  • 终端输入:patbundle patch -o test01old.jsbundle -n test01new.jsbundle


    生成的差异化文件

iOS实现生成差异化文件

简单方法:把diff-match-patch实现源码拖进工程中


选择源码
拖进工程中

导入#import "DiffMatchPatch.h"开始使用,下面演示用l1.txt和l2.txt文件来展示,可以比较直观的看出效果
l1.txt文本:123
l2.txt文本:12345

- (void)demo1{
  // 获取l1.txt文件路径
  NSString *path01 = [[NSBundle mainBundle]pathForResource:@"l1" ofType:@"txt"];
  // 根据l1.txt文件路径获取data内容
  NSData *data01 = [NSData dataWithContentsOfFile:path01];
  // 将data内容转换成字符串格式
  NSString *str01 = [[NSString alloc] initWithData:data01 encoding:NSUTF8StringEncoding];
  // 获取l2.txt文件路径
  NSString *path02 = [[NSBundle mainBundle]pathForResource:@"l2" ofType:@"txt"];
  // 根据l2.txt文件路径获取data内容
  NSData *data02 = [NSData dataWithContentsOfFile:path02];
  // 将data内容转换成字符串格式
  NSString *str02 = [[NSString alloc] initWithData:data02 encoding:NSUTF8StringEncoding];
  // 创建DiffMatchPatch工具类对象
  DiffMatchPatch *patch = [[DiffMatchPatch alloc]init];
  // 对比文件内容
  // 执行该语句之后会在bundle目录下生成patches.bat文件(差异补丁文件)
  NSMutableArray *patchesArr = [patch diff_mainOfOldString:str01 andNewString:str02 checkLines:YES];
  // 生成差异补丁包
  NSArray *patchesArr1 = [patch patch_makeFromDiffs:patchesArr];
  // 解析补丁包
  NSArray *newArray = [patch patch_apply:patchesArr1 toString:str01];
  //写入到新文件(注意:这边为了在PC端更加直观的看,直接写入到绝对路径)
  BOOL isTrue = [newArray[0] writeToFile:@"/Users/devil/Desktop/自己的/RNPlatForm/ios/l1.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];
  if (isTrue) {
    NSLog(@"写入成功");
  }else{
    NSLog(@"写入失败");
  }
}

执行代码后:
l1.txt文本:12345

iOS实现patches.pat与旧jsbundle离线包合并得到新的jsbundle离线包

- (void)demo2{
  // 获取l1.txt文件路径
  NSString *path01 = [[NSBundle mainBundle]pathForResource:@"l1" ofType:@"txt"];
  // 根据l1.txt文件路径获取data内容
  NSData *data01 = [NSData dataWithContentsOfFile:path01];
  // 将data内容转换成字符串格式
  NSString *str01 = [[NSString alloc] initWithData:data01 encoding:NSUTF8StringEncoding];
  // 创建DiffMatchPatch工具类对象
  DiffMatchPatch *patch = [[DiffMatchPatch alloc]init];
  // 获取差异化文件包路径
  NSString *patchesPath = [[NSBundle mainBundle]pathForResource:@"patches.pat" ofType:nil];
  //获取差异化文件内容
  NSData *patchesData = [NSData dataWithContentsOfFile:patchesPath];
  //解析差异化文件内容
  NSString *patchesStr = [[NSString alloc]initWithData:patchesData encoding:NSUTF8StringEncoding];
  //转换pat
  NSMutableArray *patchesArr = [patch patch_fromText:patchesStr error:nil];
  // 解析补丁包
  NSArray *newArray = [patch patch_apply:patchesArr toString:str01];
  //获取新文件路径
//  NSString *newFilePath = [[NSBundle mainBundle]pathForResource:@"text3" ofType:@"txt"];
  //写入到新文件(注意:这边为了在PC端更加直观的看,直接写入到绝对路径)
  BOOL isTrue = [newArray[0] writeToFile:@"/Users/devil/Desktop/自己的/RNPlatForm/ios/text3.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];
  if (isTrue) {
    NSLog(@"写入成功");
  }else{
    NSLog(@"写入失败");
  }
}

实现本地更新离线包

//创建两个按钮,第一个按钮跳转RN界面,加载jsbundle包,第二个按钮负责更新jsbundle包
UIButton *btn4 = [[UIButton alloc]init];
  [btn4 setTitle:@"第五个" forState:UIControlStateNormal];
  [btn4 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
  btn4.frame = CGRectMake(40, 170, 60, 30);
  [btn4 addTarget:self action:@selector(clickFifth) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:btn4];
  
  UIButton *btn5 = [[UIButton alloc]init];
  [btn5 setTitle:@"更新第五个界面" forState:UIControlStateNormal];
  [btn5 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
  btn5.frame = CGRectMake(40, 200, 60, 30);
  [btn5 addTarget:self action:@selector(demo2) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:btn5];
//btn4按钮点击事件
- (void)clickFifth{
  NSURL *jsCodeLocation;
  jsCodeLocation = [[NSBundle mainBundle]URLForResource:@"test01old" withExtension:@"jsbundle"];
  [self creactRNPath:jsCodeLocation moduleName:@"test01platcode"]; 
}

- (void)creactRNPath:(NSURL *)jsCodeLocation moduleName:(NSString *)moduleName{
  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                      moduleName:moduleName
                                               initialProperties:nil
                                                   launchOptions:nil];
  rootView.backgroundColor = [[UIColor alloc] initWithRed:1.0f green:1.0f blue:1.0f alpha:1];
  UIViewController *rootViewController = [[UIViewController alloc]init];
  rootViewController.view = rootView;
  [rootViewController.navigationController setNavigationBarHidden:YES animated:YES];
  [self.navigationController pushViewController:rootViewController animated:YES];
}
//btn5按钮点击事件
- (void)demo2{
  // 获取test01old.jsbundle文件路径
  NSString *path01 = [[NSBundle mainBundle]pathForResource:@"test01old" ofType:@"jsbundle"];
  // 根据test01old.jsbundle文件路径获取data内容
  NSData *data01 = [NSData dataWithContentsOfFile:path01];
  // 将data内容转换成字符串格式
  NSString *str01 = [[NSString alloc] initWithData:data01 encoding:NSUTF8StringEncoding];
  // 创建DiffMatchPatch工具类对象
  DiffMatchPatch *patch = [[DiffMatchPatch alloc]init];
  // 获取差异化文件包路径
  NSString *patchesPath = [[NSBundle mainBundle]pathForResource:@"test01patches.pat" ofType:nil];
  //获取差异化文件内容
  NSData *patchesData = [NSData dataWithContentsOfFile:patchesPath];
  //解析差异化文件内容
  NSString *patchesStr = [[NSString alloc]initWithData:patchesData encoding:NSUTF8StringEncoding];
  //转换pat
  NSMutableArray *patchesArr = [patch patch_fromText:patchesStr error:nil];
  // 解析补丁包
  NSArray *newArray = [patch patch_apply:patchesArr toString:str01];
  //写入到新文件
  BOOL isTrue = [newArray[0] writeToFile:path01 atomically:YES encoding:NSUTF8StringEncoding error:nil];
  if (isTrue) {
    NSLog(@"写入成功");
  }else{
    NSLog(@"写入失败");
  }
}

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