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#import <Foundation/Foundation.h>

extern "C"
{
    void _callObjcMethod(const char *msg)
    {
        // コンソールにログを出力
        NSString *str = [NSString stringWithCString:msg encoding:NSUTF8StringEncoding];
        NSLog(str);
    }
}

using System.Collections.Generic;
using UnityEngine;
using System.Runtime.InteropServices;

public class SamplePlugin : MonoBehaviour
{
	#if UNITY_IOS && !UNITY_EDITOR
	[DllImport ("__Internal")]
	static extern void _callObjcMethod (string msg);
	#endif

	public static void CallObjcMethod (string msg)
	{
		#if UNITY_IOS && !UNITY_EDITOR
		_callObjcMethod (msg);
		#endif
	}
}

using UnityEngine;

public class Test : MonoBehaviour
{
	public int cnt;

	void Update ()
	{
		SamplePlugin.CallObjcMethod (cnt.ToString ());
		cnt++;
	}
}