Extend iOS with swift

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
    img
    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>

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