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.pngreact-native打ios离线包
- 打包命令说明
react-native bundle
Options:
--entry-file <path> 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 <string> 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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