Unity调用原生(iOS, Android)方法

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

public class TestScript : MonoBehaviour {
    // This tells unity to look up the function FooPluginFunction
    // inside the static binary
    [DllImport ("__Internal")]
    private static extern float doTestSelector (string info);

    void doTest () {
#if UNITY_ANDROID
        using (AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
        {
            using( AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity"))
            {
                jo.Call("doTestSelector", "my info");
            }
        }
#endif
        
#if UNITY_IPHONE
        doTestSelector("my info");
#endif
    }

　　public void backToUnity () {
　　　　// Do somthing...
　　}

}

extern "C" float doTestSelector(const char* info) {
    YourViewController *vc = [[YourViewController alloc] initWithNibName:@"yourViewControllerName" bundle:nil];
    [[UnityGetMainWindow() rootViewController] presentViewController:vc animated:YES completion:nil];
    
    return 0.0f;
}

- (IBAction)OnClickBack:(id)sender {
    [self dismissViewControllerAnimated:YES completion:nil];
    UnitySendMessage("TestScriptGameObject", [@"backToUnity" UTF8String], [@"" UTF8String]);
}