Executing Objective-C code from Haxe (Using NME's native extensions)

.building.txt

#in the Extension folder:

haxelib run hxcpp Build.xml -Diphoneos #device

#or

haxelib run hxcpp Build.xml -Diphonesim #simulator

#or

haxelib run hxcpp Build.xml #desktop - Mac or Windows respectively

#then build the Haxe project, and use XCode to compile and deploy the C++ code 

Build.xml

<!-- PATH: Extension/project/Build.xml-->
<!-- .... -->

!-- Find the "files" section -->

<files id="common">
   <compilerflag value="-Iinclude"/>
   <file name="common/ExternalInterface.cpp"/>
   <file name="common/Test.cpp"/>

   !-- Insert the ObjCTest.mm file there -->
   <file name="common/ObjCTest.mm"/>
</files>

<!-- .... -->

Extension Test.nmml

<!-- PATH: Project/Extension Test.nmml -->

<!-- change the following line -->
<include path="../Extension" />
<!-- to -->
<extension name="test" path="../Extension" />

ExtensionTest.hx

<!-- PATH: Project/ExtensionTest.hx -->

private function construct ():Void {
    Test.nslog();
}

ExternalInterface.cpp

<!-- PATH: Extension/project/common/ExternalInterface.cpp -->

#include "ObjCTest.h"

//....

using namespace test;

static value test_nslog () {
	return alloc_int (testNSLog ());
	
}
DEFINE_PRIM (test_nslog, 0);

ObjCTest.h

<!-- PATH: Extension/project/include/ObjCTest.h-->

#import <hx/CFFI.h>

namespace test {

	int testNSLog();
}

ObjCTest.mm

<!-- PATH: Extension/project/common/ObjCTest.mm-->
<!-- NOTE: It is important to use the extension ".mm" (Objective-C++) 
rather than ".m" (Objective-C)
-->

#import "ObjCTest.h"
#import <Foundation/Foundation.h>

namespace test {
	int testNSLog(value str) {
                
                //I know, the example is super silly, but easy enough to
                //demonstrate the idea
                NSString *msg = [[NSString alloc] initWithCString:"Testing..."];  
		NSLog(msg);

		return 0;
	} 
}

Test.hx

<!-- PATH: Extension/Test.hx -->

public static function nslog (message:String):Void {
    objc_call_nslog (message);
}

//...

private static var objc_call_nslog = Lib.load ("test", "test_nslog", 0);
// the "0" is for the number of arguments that the function accepts