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DSBridge for IOS

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

DSBridge-Android：https://github.com/wendux/DSBridge-Android

Notice

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

Features

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

​

Installation

pod "dsBridge"

Examples

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

To use a dsBridge in your own project:

Usage

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);
   }
   @end 

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

     //cdn
     //<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/dsbridge.js"> //</script>
     //npm
     //npm install [email protected]
     var dsBridge=require("dsbridge")

   • Call Native API and register a javascript API for Native invocation

     //Call synchronously 
     var str=dsBridge.call("testSyn","testSyn");
     
     //Call asynchronously
     dsBridge.call("testAsyn","testAsyn", function (v) {
       alert(v);
     })
     
     //Register javascript API for Native
      dsBridge.register('addValue',function(l,r){
          return l+r;
      })

4. Call Javascript API in Object-C

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

Namespace

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
{
    value=10;
    hanlder=completionHandler;
    timer =  [NSTimer scheduledTimerWithTimeInterval:1.0
                                              target:self
                                            selector:@selector(onTimer:)
                                            userInfo:nil
                                             repeats:YES];
}
-(void)onTimer:t{
    if(value!=-1){
        hanlder([NSNumber numberWithInt:value--],NO);
    }else{
        hanlder(@"",YES);
        [timer invalidate];
    }
}

In Javascript

dsBridge.call("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.

WKUIDelegate

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 bridge.call("namespace.api",...).

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

Example:

In Object-c

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

In Javascript

// call echo.syn
var ret=dsBridge.call("echo.syn",{msg:" I am echoSyn call", tag:1})
alert(JSON.stringify(ret))  
// call echo.asyn
dsBridge.call("echo.asyn",{msg:" I am echoAsyn call",tag:2},function (ret) {
      alert(JSON.stringify(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.

Example:

[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).

Example:

[dwebview disableJavascriptDialogBlock: true]

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

setJavascriptCloseWindowListener:(void(^_Nullable)(void))callback

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

Example:

[dwebview setJavascriptCloseWindowListener:^{
        NSLog(@"window.close called");
}];

hasJavascriptMethod:(NSString*) handlerName methodExistCallback:(void(^)(bool exist))callback

Test whether the handler exist in javascript.

Example:

// 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.

Example:

[dwebview customJavascriptDialogLabelTitles:@{
 @"alertTitle":@"Notification",
 @"alertBtn":@"OK",
 @"confirmTitle":@"",
 @"confirmCancelBtn":@"CANCEL",
 @"confirmOkBtn":@"OK",
 @"promptCancelBtn":@"CANCEL",
 @"promptOkBtn":@"OK"
}];

Javascript API

dsBridge

"dsBridge" is accessed after dsBridge Initialization .

dsBridge.call(method,[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.

dsBridge.register(methodName|namespace,function|synApiObject)

dsBridge.registerAsyn(methodName|namespace,function|asyApiObject)

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

1. Just register a method. For example:

   In Javascript

   dsBridge.register('addValue',function(l,r){
        return l+r;
   })
   dsBridge.registerAsyn('append',function(arg1,arg2,arg3,responseCallback){
        responseCallback(arg1+" "+arg2+" "+arg3);
   })

   In Object-c

   // call javascript method
   [dwebview callHandler:@"addValue" arguments:@[@3,@4] completionHandler:^(NSNumber * value){
         NSLog(@"%@",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
   dsBridge.register("test",{
     tag:"test",
     test1:function(){
   	return this.tag+"1"
     },
     test2:function(){
   	return this.tag+"2"
     }
   })
     
   //namespace test1 for asynchronous calls  
   dsBridge.registerAsyn("test1",{
     tag:"test1",
     test1:function(responseCallback){
   	return responseCallback(this.tag+"1")
     },
     test2:function(responseCallback){
   	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);
   }];

dsBridge.hasNativeMethod(handlerName,[type])

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

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

dsBridge.hasNativeMethod('testAsyn') 
//test namespace method
dsBridge.