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DSBridge for IOS


cocoapods MIT Licence support platform GitHub last commit

Modern cross-platform JavaScript bridge, through which you can invoke each other's functions synchronously or asynchronously between JavaScript and native applications.



DSBridge v3.0 is a milestone version. Compared with v2.0, we have made a lot of changes. Note that v3.0 is incompatible with v2.0, but v2.0 will continue to maintain. If you are a new user, use >=v3.0.

DSBridge v3.0.0 change list


  1. The three ends of Android, IOS and Javascript are easy to use, light and powerful, safe and strong

  2. Both synchronous and asynchronous calls are supported

  3. Support API Object, which centrally implements APIs in a Java Class or a Javascript object

  4. Support API namespace

  5. Support debug mode

  6. Support the test of whether API exists

  7. Support Progress Callback: one call, multiple returns

  8. Support event listener for Javascript to close the page

  9. Support Modal and Modeless popup box for javascript

  10. Support the X5 webcore of Tencent for Android


pod "dsBridge"


See the dsbridgedemo/ package. run the app project and to see it in action.

To use a dsBridge in your own project:


  1. Implement APIs in a class

    #import "dsbridge.h" 
    @implementation JsApiTest
    //for synchronous invocation  
    - (NSString *) testSyn:(NSString *) msg
        return [msg stringByAppendingString:@"[ syn call]"];
    //for asynchronous invocation
    - (void) testAsyn:(NSString *) msg :(JSCallback)completionHandler
        completionHandler([msg stringByAppendingString:@" [ asyn call]"],YES);
  2. add API object to DWKWebView

    DWKWebView * dwebview=[[DWKWebView alloc] initWithFrame:bounds];
    // register api object without namespace
    [dwebview addJavascriptObject:[[JsApiTest alloc] init] namespace:nil];
  3. Call Native (Java/Object-c/swift) API in Javascript, and register javascript API 。

    • Init dsBridge

      //<script src=""> //</script>
      //npm install dsbridge@3.1.4
      var dsBridge=require("dsbridge")
    • Call Native API and register a javascript API for Native invocation

      //Call synchronously 
      //Call asynchronously"testAsyn","testAsyn", function (v) {
      //Register javascript API for Native
           return l+r;
  4. Call Javascript API in Object-C

    [dwebview callHandler:@"addValue" arguments:@[@3,@4] completionHandler:^(NSNumber* value){

Object-C API signature

In order to be compatible with IOS , we make the following convention on Object-C API signature:

  1. For synchronous API.

    (id) handler:(id) msg

    • The argument type can be any class type, but the type of return value can't be void.
  2. For asynchronous API.

    (void) handler:(id) arg :(JSCallback)completionHandler)

    JSCallback is a block type:

    typedef void (^JSCallback)(NSString * _Nullable result,BOOL complete); 

    Attention: API name can't start with "init", because it is reserved in OC class.

Using in Swift

In Swift, you should declare APIs as follows:

//MUST USE "_" to ignore the first argument name explicitly。
@objc func testSyn( _ arg:String) -> String {
	return String(format:"%@[Swift sync call:%@]", arg, "test")

@objc func testAsyn( _ arg:String, handler: (String, Bool)->Void) {
	handler(String(format:"%@[Swift async call:%@]", arg, "test"), true)

Two points you should keep in mind:

  • Must add "@objc" to Swift API.
  • Must use "_" to ignore the first argument name explicitly

The complete example is here .


Namespaces can help you better manage your APIs, which is very useful in hybrid applications, because these applications have a large number of APIs. DSBridge (>= v3.0.0) allows you to classify API with namespace. And the namespace can be multilevel, between different levels with '.' division.

Debug mode

In debug mode, some errors will be prompted by a popup dialog , and the exception caused by the native APIs will not be captured to expose problems. We recommend that the debug mode be opened at the development stage. You can open debug mode :

// open debug mode
[dwebview setDebugMode:true];

Progress Callback

Normally, when a API is called to end, it returns a result, which corresponds one by one. But sometimes a call need to repeatedly return multipule times, Suppose that on the Native side, there is a API to download the file, in the process of downloading, it will send the progress information to Javascript many times, then Javascript will display the progress information on the H5 page. Oh...You will find it is difficult to achieve this function. Fortunately, DSBridge supports Progress Callback. You can be very simple and convenient to implement a call that needs to be returned many times. Here's an example of a countdown:

In Object-c

- ( void )callProgress:(NSDictionary *) args :(JSCallback)completionHandler
    timer =  [NSTimer scheduledTimerWithTimeInterval:1.0
        hanlder([NSNumber numberWithInt:value--],NO);
        [timer invalidate];

In Javascript"callProgress", function (value) {
    document.getElementById("progress").innerText = value

For the complete sample code, please refer to the demo project.

Javascript popup box

For Javascript popup box functions (alert/confirm/prompt), DSBridge has implemented them all by default. the default dialog label text language is Chinese, you can custom the text by calling customJavascriptDialogLabelTitles. If you still want to implement them by yourself , set the DSUIDelegate property which is a proxy of WKUIDelegate.

Note That the default dialog box implemented by DSBridge is modal. This will block the UI thread. If you need modeless, please refer to disableJavascriptDialogBlock.


In DWKWebView , please use DSUIDelegate instead of UIDelegate , because UIDelegate has already been set inner DWKWebView , DSUIDelegate is a proxy of UIDelegate .

API Reference

Object-C API

In Object-c, the object that implements the javascript interfaces is called Object-c API object.

addJavascriptObject:(id) object namespace:(NSString *) namespace

Add the Object-c API object with supplied namespace into DWKWebView. The javascript can then call OC APIs with"namespace.api",...).

If the namespace is empty, the Object-c API object have no namespace. The javascript can call OC APIs with"api",...).


In Object-c

@implementation JsEchoApi
- (id) syn:(id) arg
    return arg;
- (void) asyn: (id) arg :(JSCallback)completionHandler
// register api object with namespace "echo"
[dwebview addJavascriptObject:[[JsEchoApi alloc] init] namespace:@"echo"];

In Javascript

// call echo.syn
var"echo.syn",{msg:" I am echoSyn call", tag:1})
// call echo.asyn"echo.asyn",{msg:" I am echoAsyn call",tag:2},function (ret) {
removeJavascriptObject:(NSString *) namespace

Remove the Object-c API object with supplied namespace.

callHandler:(NSString *) methodName arguments:(NSArray *) args
callHandler:(NSString *) methodName completionHandler:(void (^)(id value))completionHandler
callHandler:(NSString *) methodName arguments:(NSArray *) args completionHandler:(void (^ )(id value))completionHandler

Call the javascript API. If a completionHandler is given, the javascript handler can respond. the methodName can contain the namespace. The completionHandler will be called in main thread.


[dwebview callHandler:@"append" arguments:@[@"I",@"love",@"you"]
  completionHandler:^(NSString * _Nullable value) {
       NSLog(@"call succeed, append string is: %@",value);
// call with namespace 'syn', More details to see the Demo project                    
[dwebview callHandler:@"syn.getInfo" completionHandler:^(NSDictionary * _Nullable value) {
        NSLog(@"Namespace syn.getInfo: %@",value);
disableJavascriptDialogBlock:(bool) disable

BE CAREFUL to use. if you call any of the javascript popup box functions (alert, confirm, and prompt), the app will hang, and the javascript execution flow will be blocked. if you don't want to block the javascript execution flow, call this method, the popup box functions will return immediately( confirm return true, and the prompt return empty string).


[dwebview disableJavascriptDialogBlock: true]

if you want to enable the block, just calling this method with the argument value false .


DWKWebView calls callback when Javascript calls window.close, you can provide a block to add your hanlder .


[dwebview setJavascriptCloseWindowListener:^{
        NSLog(@"window.close called");
hasJavascriptMethod:(NSString*) handlerName methodExistCallback:(void(^)(bool exist))callback

Test whether the handler exist in javascript.


// test if javascript method exists.
[dwebview hasJavascriptMethod:@"addValue" methodExistCallback:^(bool exist) {
      NSLog(@"method 'addValue' exist : %d",exist);
setDebugMode:(bool) debug

Set debug mode. if in debug mode, some errors will be prompted by a popup dialog , and the exception caused by the native APIs will not be captured to expose problems. We recommend that the debug mode be opened at the development stage.

customJavascriptDialogLabelTitles:(NSDictionary*) dic

custom the label text of javascript dialog that includes alert/confirm/prompt, the default text language is Chinese.


[dwebview customJavascriptDialogLabelTitles:@{

Javascript API


"dsBridge" is accessed after dsBridge Initialization .,[arg,callback])

Call Java api synchronously and asynchronously。

method: Java API name, can contain the namespace。

arg: argument, Only one allowed, if you expect multiple parameters, you can pass them with a json object.

callback(String returnValue): callback to handle the result. only asynchronous invocation required.


Register javascript synchronous and asynchronous API for Native invocation. There are two types of invocation

  1. Just register a method. For example:

    In Javascript

         return l+r;
         responseCallback(arg1+" "+arg2+" "+arg3);

    In Object-c

    // call javascript method
    [dwebview callHandler:@"addValue" arguments:@[@3,@4] completionHandler:^(NSNumber * value){
    [dwebview callHandler:@"append" arguments:@[@"I",@"love",@"you"] completionHandler:^(NSString * _Nullable value) {
         NSLog(@"call succeed, append string is: %@",value);

  2. Register a Javascript API object with supplied namespace. For example:

    In Javascript

    //namespace test for synchronous
    	return this.tag+"1"
    	return this.tag+"2"
    //namespace test1 for asynchronous calls  
    	return responseCallback(this.tag+"1")
    	return responseCallback(this.tag+"2")

    Because JavaScript does not support function overloading, it is not possible to define asynchronous function and sync function of the same name。

    In Object-c

    [dwebview callHandler:@"test.test1" completionHandler:^(NSString * _Nullable value) {
            NSLog(@"Namespace test.test1: %@",value);
    [dwebview callHandler:@"test1.test1" completionHandler:^(NSString * _Nullable value) {
            NSLog(@"Namespace test1.test1: %@",value);

Test whether the handler exist in Java, the handlerName can contain the namespace.

type: optional["all"|"syn"|"asyn" ], default is "all".

//test namespace method
// test if exist a asynchronous function that named "testSyn"
dsBridge.hasNativeMethod('testSyn','asyn') //false

Calling dsBridge.disableJavascriptDialogBlock(...) has the same effect as calling disableJavascriptDialogBlock in Java.



Work with fly.js

As we all know, In browser, AJax request are restricted by same-origin policy, so the request cannot be initiated across the domain. However, Fly.js supports forwarding the http request to Native through any Javascript bridge, And fly.js has already provide the dsBridge adapter.Because the Native side has no the same-origin policy restriction, fly.js can request any resource from any domain.

Another typical scene is in the hybrid App, Fly.js will forward all requests to Native, then, the unified request management, cookie management, certificate verification, request filtering and so on are carried out on Native.

More details please refer to


If you like DSBridge, please star to let more people know it , Thank you !


🌏 A modern cross-platform JavaScript bridge, through which you can invoke each other's functions synchronously or asynchronously between JavaScript and native.







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