---

title: Extend iOS with swift type: guide group: Extend order: 6.4 version: 2.1

Swift In Weex

Swift and Objective-C mix-up

a complete demo

extend module using swift

As we export moudle method using macro and calling in runtime, so we can extend module using swift by extension bjective-C class.

You can also finish extending module by write an category for swift class in Objective-C class.

• new WXSwiftTestModule.h/m and WXSwiftTestModule.swift file ，you will get a tip as follow during the creation choose Create Bridging Header, as we need to access method in Objective-C in swift file, and the Bridging header can help us. And the format name of the header file is yourTarget-Bridging-Header.h, and mine is WeexDemo-Bridging-Header.h.

• implementation in WXSwiftTestModule.h/m

  • WXSwiftTestModule.h

        #import <Foundation/Foundation.h>
        #import <WeexSDK/WeexSDK.h>
    
        @interface WXSwiftTestModule : NSObject <WXModuleProtocol>
    
        @end
    
    

  • WXSwiftTestModule.m

    you can search WeexDemo-Swift.h after building your project, Xcode will generate this file for us.

    for simulator the file path may be:

    weex/ios/playground/DerivedData/WeexDemo/Build/Intermediates/WeexDemo.build/Debug-iphonesimulator/WeexDemo.build/DerivedSources/WeexDemo-Swift.h
    

    export method define in swift file.

        #import "WXSwiftTestModule.h"
        #import "WeexDemo-Swift.h" // you need to import the header to make Objective-C code recognize the method defined in swift file.
    
        @implementation WXSwiftTestModule
        #pragma clang diagnostic push //forbid unknow selector warrning
        #pragma clang diagnostic ignored "-Wundeclared-selector"
    
        WX_EXPORT_METHOD(@selector(printSome:callback:)) //method name in Swift, you can get the final method name in `WeexDemo-Swift.h` as the convert of Xcode.
    
        #pragma clang diagnostic pop
    
        @end
    
    

• in Swift make an extension for Objective-C class WXSwiftTestModule, add a method, and then export it in Objective-C, then we can use it in javaScript.

  • WXSwiftTestModule.swift

        import Foundation
        public extension WXSwiftTestModule {
           public func printSome(someThing:String, callback:WXModuleCallback) {
               print(someThing)
               callback(someThing)
           }
        }
    

  we need to expose WXSwiftTestModule WXModuleCallback in WeexDemo-Bridging-Header as our Objective-C need to access them

  • WeexDemo-Bridging-Header.h

    //
    //  Use this file to import your target's public headers that you would like to expose to Swift.
    //
    #import "WXSwiftTestModule.h"
    #import "WeexSDK.h"
    

    by far we have finished our module using swift.

  module usage

  • register module to WeexSDK

    [WXSDKEngine registerModule:@"swifter" withClass:[WXSwiftTestModule class]];
    
    

  • front-end usage

      <template>
          <text>Swift Module</text>
      </template>
    
      <script>
        module.exports = {
          ready: function() {
            var swifter = weex.require('swifter');
            swifter.printSome("https://www.taobao.com",function(param){
              nativeLog(param);
            });
          }
    
        };
      </script>