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JSPatch bridge Objective-C and Javascript using the Objective-C runtime. You can call any Objective-C class and method in JavaScript by just including a small engine. JSPatch is generally used to hotfix iOS App.
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bang590 Merge pull request #818 from welcommand/master
Support more block feature without libffi
Latest commit e80a557 Apr 22, 2018


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Demo fix (CGFloat)1.3 != 1.3 in ip4&iOS8 Mar 28, 2018
Extensions Manage Block memory with ARC Aug 7, 2017
JSPatch fix some bug Mar 26, 2018
Loader tidy up codes; [bugfix] temporary files won't be cleared if network Jan 21, 2016
.gitignore ignore .DS_Store Dec 23, 2015
.travis.yml Update .travis.yml Dec 29, 2016
JSPatch.podspec fix a warning for libffi.a Mar 10, 2017
LICENSE Initial commit May 25, 2015 Update README Dec 23, 2015 Fix broken Markdown headings Apr 17, 2017


Travis CocoaPods Version License

中文介绍 | 文档 | JSPatch平台

请大家不要自行接入 JSPatch,统一接入 JSPatch 平台,让热修复在一个安全和可控的环境下使用。原因详见 这里

JSPatch bridges Objective-C and JavaScript using the Objective-C runtime. You can call any Objective-C class and method in JavaScript by just including a small engine. That makes the APP obtaining the power of script language: add modules or replacing Objective-C code to fix bugs dynamically.

JSPatch is still in development, welcome to improve the project together.

Notice: Please go to Wiki to get full document.


@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
    [JPEngine startEngine];
    NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"demo" ofType:@"js"];
    NSString *script = [NSString stringWithContentsOfFile:sourcePath encoding:NSUTF8StringEncoding error:nil];
    [JPEngine evaluateScript:script];
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    [self.window addSubview:[self genView]];
    [self.window makeKeyAndVisible];
    return YES;

- (UIView *)genView
    return [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];

// demo.js
require('UIView, UIColor, UILabel')
defineClass('AppDelegate', {
  // replace the -genView method
  genView: function() {
    var view = self.ORIGgenView();
    var label = UILabel.alloc().initWithFrame(view.frame());
    return view;

You can also try to use JSPatch Convertor to convertor code from Objective-C to JavaScript automatically.



CocoaPods is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries like JSPatch in your projects. See the "Getting Started" guide for more information.

# Your Podfile
platform :ios, '6.0'
pod 'JSPatch'


Copy JSEngine.m JSEngine.h JSPatch.js in JSPatch/ to your project.



  1. #import "JPEngine.h"
  2. call [JPEngine startEngine]
  3. exec JavasScript by [JPEngine evaluateScript:@""]
[JPEngine startEngine];

// exec js directly
[JPEngine evaluateScript:@"\
 var alertView = require('UIAlertView').alloc().init();\
 alertView.setMessage('AlertView from js'); \
 alertView.addButtonWithTitle('OK');\; \

// exec js file from network
[NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@""]] queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
    NSString *script = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    [JPEngine evaluateScript:script];

// exec local js file
NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"sample" ofType:@"js"];
NSString *script = [NSString stringWithContentsOfFile:sourcePath encoding:NSUTF8StringEncoding error:nil];
[JPEngine evaluateScript:script];


Base Usage

require('UIView, UIColor, UISlider, NSIndexPath')

// Invoke class method
var redColor = UIColor.redColor();

// Invoke instance method
var view = UIView.alloc().init();

// set proerty

// get property 
var bgColor = view.backgroundColor();

// multi-params method (use underline to separate)
// OC:NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:1];
var indexPath = NSIndexPath.indexPathForRow_inSection(0, 1);

// method name contains underline (use double undeline to represent)
// OC: [JPObject _privateMethod];

// use .toJS() to convert NSArray / NSString / NSDictionary to JS type.
var arr = require('NSMutableArray').alloc().init()
jsArr = arr.toJS()
console.log(jsArr.push("Patch").join(''))  //output: JSPatch

// use hashes to represent struct like CGRect / CGSize / CGPoint / NSRange
var view = UIView.alloc().initWithFrame({x:20, y:20, width:100, height:100});
var x = view.bounds().x;

// wrap function with `block()` when passing block from JS to OC
// OC Method: + (void)request:(void(^)(NSString *content, BOOL success))callback
require('JPObject').request(block("NSString *, BOOL", function(ctn, succ) {
  if (succ) log(ctn)

// GCD
dispatch_after(1.0, function(){
  // do something
  // do something

Go to wiki page for more details: Base Usage


You can redefine an existing class and override methods.

// OC
@implementation JPTableViewController
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(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")
// JS
defineClass("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);

  dataSource: function() {
    // get the original method by adding prefix 'ORIG'
    var data = self.ORIGdataSource().toJS();
    return data.push('Good!');
}, {})

Go to wiki page for more details: Usage of defineClass


There are some extensions provide support for custom struct type, C methods and other functional, call +addExtensions: after starting engine to add extensions:

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
    [JPEngine startEngine];

    //add extensions after startEngine
    [JPEngine addExtensions:@[@"JPInclude", @"JPCGTransform"]];

    NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"demo" ofType:@"js"];
    NSString *script = [NSString stringWithContentsOfFile:sourcePath encoding:NSUTF8StringEncoding error:nil];
    [JPEngine evaluateScript:script];

include('test.js')   //include function provide by JPInclude.m
var view = require('UIView').alloc().init()

//CGAffineTransform is supported in JPCGTransform.m
view.setTransform({a:1, b:0, c:0, d:1, tx:0, ty:100})

Extensions can be added dynamiclly in JS, which is recommended:

require('JPEngine').addExtensions(['JPInclude', 'JPCGTransform'])

// `include()` and `CGAffineTransform` is avaliable now.

You can create your own extension to support custom struct type and C methods in project, see the wiki page for more details: Adding new extensions


  • iOS 7+, forward compatibility with iOS 6
  • JavaScriptCore.framework
  • Support armv7/armv7s/arm64
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