JSPatch 可以让你用 JavaScript 书写原生 iOS APP。只需在项目引入极小的引擎,就可以使用 JavaScript 调用任何 Objective-C 的原生接口,获得脚本语言的优势:为项目动态添加模块,或替换项目原生代码动态修复 bug。
项目仍在开发中,欢迎一起完善这个项目。
注意:完善的文档请移步 Wiki。
@implementationAppDelegate - (BOOL)application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [JPEngine startEngine]; NSString *sourcePath = [[NSBundlemainBundle] pathForResource:@"demo"ofType:@"js"]; NSString *script = [NSStringstringWithContentsOfFile:sourcePath encoding:NSUTF8StringEncoding error:nil]; [JPEngine evaluateScript:script]; self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; [self.window addSubview:[selfgenView]]; [self.window makeKeyAndVisible]; returnYES; } - (UIView *)genView { return [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 320)]; } @end
// demo.jsrequire('UIView, UIColor, UILabel')defineClass('AppDelegate',{// replace the -genView methodgenView: function(){varview=self.ORIGgenView();view.setBackgroundColor(UIColor.greenColor())varlabel=UILabel.alloc().initWithFrame(view.frame());label.setText("JSPatch");label.setTextAlignment(1);view.addSubview(label);returnview;}});
可以使用 JSPatch Convertor 自动把 Objective-C 代码转为 JavaScript 代码。
拷贝 JSPatch/
目录下的三个文件 JSEngine.m
/ JSEngine.h
/ JSPatch.js
到项目里即可。
#import "JPEngine.h"
- 调用
[JPEngine startEngine]
- 通过
[JPEngine evaluateScript:@""]
接口执行 JavaScript。
[JPEngine startEngine]; // 直接执行js [JPEngine evaluateScript:@"\ var alertView = require('UIAlertView').alloc().init();\ alertView.setTitle('Alert');\ alertView.setMessage('AlertView from js'); \ alertView.addButtonWithTitle('OK');\ alertView.show(); \"]; // 从网络拉回js脚本执行 [NSURLConnectionsendAsynchronousRequest:[NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://cnbang.net/test.js"]] queue:[NSOperationQueuemainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { NSString *script = [[NSStringalloc] initWithData:data encoding:NSUTF8StringEncoding]; [JPEngine evaluateScript:script]; }]; // 执行本地js文件NSString *sourcePath = [[NSBundlemainBundle] pathForResource:@"sample"ofType:@"js"]; NSString *script = [NSStringstringWithContentsOfFile:sourcePath encoding:NSUTF8StringEncoding error:nil]; [JPEngine evaluateScript:script];
// 调用require引入要使用的OC类require('UIView, UIColor, UISlider, NSIndexPath')// 调用类方法varredColor=UIColor.redColor();// 调用实例方法varview=UIView.alloc().init();view.setNeedsLayout();// set proertyview.setBackgroundColor(redColor);// get property varbgColor=view.backgroundColor();// 多参数方法名用'_'隔开:// OC:NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:1];varindexPath=NSIndexPath.indexPathForRow_inSection(0,1);// 方法名包含下划线'_',js用双下划线表示// OC: [JPObject _privateMethod];JPObject.__privateMethod()// 如果要把 `NSArray` / `NSString` / `NSDictionary` 转为对应的 JS 类型,使用 `.toJS()` 接口.vararr=require('NSMutableArray').alloc().init()arr.addObject("JS")jsArr=arr.toJS()console.log(jsArr.push("Patch").join(''))//output: JSPatch// 在JS用字典的方式表示 CGRect / CGSize / CGPoint / NSRangevarview=UIView.alloc().initWithFrame({x:20,y:20,width:100,height:100});varx=view.bounds().x;// block 从 JavaScript 传入 Objective-C 时,需要写上每个参数的类型。// OC Method: + (void)request:(void(^)(NSString *content, BOOL success))callbackrequire('JPObject').request(block("NSString *, BOOL",function(ctn,succ){if(succ)log(ctn)}));// GCDdispatch_after(function(1.0,function(){// do something}))dispatch_async_main(function(){// do something})
详细文档请参考wiki页面:Base Usage
用 defineClass()
定义 Objective-C 的类,对类和实例方法进行动态替换。
// OC@implementationJPTableViewController ... - (void)tableView:(UITableView *)tableViewdidSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSString *content = self.dataSource[[indexPath row]]; //may cause out of bound JPViewController *ctrl = [[JPViewController alloc] initWithContent:content]; [self.navigationController pushViewController:ctrl]; } - (NSArray *)dataSource { return @[@"JSPatch", @"is"]; } - (void)customMethod { NSLog(@"callCustom method") } @end
// JSdefineClass("JPTableViewController", { // instance method definitions tableView_didSelectRowAtIndexPath: function(tableView, indexPath) { var row = indexPath.row() if (self.dataSource().count() > row) { //fix the out of bound bug here var content = self.dataSource().objectAtIndex(row); var ctrl = JPViewController.alloc().initWithContent(content); self.navigationController().pushViewController(ctrl); } }, dataSource: function() { // get the original method by adding prefix 'ORIG' var data = self.ORIGdataSource().toJS(); return data.push('Good!'); } }, {})
详细文档请参考wiki页面:Usage of defineClass
一些自定义的struct类型、C函数调用以及其他功能可以通过扩展实现,调用 +addExtensions:
可以加载扩展接口:
@implementationAppDelegate - (BOOL)application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [JPEngine startEngine]; //添加扩展 [JPEngine addExtensions:@[@"JPInclude", @"JPCGTransform"]]; NSString *sourcePath = [[NSBundlemainBundle] pathForResource:@"demo"ofType:@"js"]; NSString *script = [NSStringstringWithContentsOfFile:sourcePath encoding:NSUTF8StringEncoding error:nil]; [JPEngine evaluateScript:script]; }
include('test.js')//`include()`方法在扩展 JPInclude.m 里提供varview=require('UIView').alloc().init()//struct CGAffineTransform 类型在 JPCGTransform.m 里提供支持view.setTransform({a:1,b:0,c:0,d:1,tx:0,ty:100})
扩展可以在JS动态加载,更推荐这种加载方式,在需要用到时才加载:
require('JPEngine').addExtensions(['JPInclude','JPCGTransform'])// `include()` and `CGAffineTransform` is avaliable now.
可以通过新增扩展为自己项目里的 struct 类型以及C函数添加支持,详情请见wiki页面:Adding new extensions
- iOS 7+
- JavaScriptCore.framework
- 支持 armv7/armv7s/arm64