Using an Objective-c framework directly in Unity 3d

Hi,

Here's what I have done: 1- Define some functions within a framework In .h :

 #import <UIKit/UIKit.h>
 
 FOUNDATION_EXPORT double TestVersionNumber;
 
 FOUNDATION_EXPORT const unsigned char TestVersionString[];
 
 @interface MyLib : NSObject
 
 + (id)sharedInstance;
 
 - (void)openWebView:(NSString *)url;
 
 - (BOOL)testMethod;
 
 @end

In .m :

 #import <Foundation/Foundation.h>
 #import "MyLib.h"
 #import "ViewController.h"
 
 @interface MyLib()
 @property (nonatomic, retain) ViewController *webViewController;
 @end
 
 @implementation MyLib
 
 - (void)dealloc {
     [[NSNotificationCenter defaultCenter] removeObserver:self];
 
 }
 
 + (id)sharedInstance {
     static dispatch_once_t pred = 0;
     static id instance = nil;
     
     dispatch_once(&pred, ^{
         instance = [[self alloc] init];
     });
     return instance;
 }
 
 - (BOOL)testMethod {
     NSLog(@"testMethod was called");
     return TRUE;
 }
 
 @end

3- I then copied the framework to 'Assets/Plugins/iOS/` folder

4- I attached this to the camera in the scene:

 using UnityEngine;
 using System.Collections;
 using System.Runtime.InteropServices;
 
 public class Ttest : MonoBehaviour {
 
 
     [DllImport ("__Internal")]
     private static extern bool testMethod();
     
 
     // Use this for initialization
     void Start () {
         var result = testMethod();
         if (result) {
             Camera.main.backgroundColor = Color.yellow;
         }
     }
 
 
 }
 

4- Built the unity project and ran in the simulator.

I get an error saying testMethod() was not found.

What's the problem? Thanks.