Xcode 11.3.1体系结构arm64的未定义符号

Question

我有一个在Unity PC上的Unity中创建的游戏，它运行正常。但是，当我试图创建一个显示在unity应用程序顶部的自定义UIView时，它会在iOS上运行。

为此，我在Assert-> Plugin-> iOS中创建了一个单音类，如下所示

#import <Foundation/Foundation.h>
  #import <UIKit/UIKit.h>
   @interface MyNativeClass : NSObject{
        NSDate *creationDate;
  }
 @end
     @implementation MyNativeClass

         static MyNativeClass * _sharedInstence;

         +(MyNativeClass *)sharedInstence{
               static dispatch_once_t onceToken;
               dispatch_once(&onceToken, ^{
               NSLog(@"Instance Class created");
              _sharedInstence =[[MyNativeClass alloc]init];
          });     
           return _sharedInstence;
       }
    -(id)init{
        self = [super init];
       if(self){
         [self initHelper];
     }
     return self;
  }

 -(void)initHelper{
     NSLog(@"Init helper called");
     creationDate = [NSDate date];
 }
-(double)getElapsedTime{
    NSLog(@"getElapsedTime");
  return [[NSDate date]timeIntervalSinceDate:creationDate];
 }
 // condensed version
 - (UIWindow*) getTopApplicationWindow
{
     // grabs the top most window
      NSArray* windows = [[UIApplication sharedApplication] windows];
      return ([windows count] > 0) ? windows[0] : nil;
 }
- (UIViewController*) getTopViewController
  {
    // get the top most window
    UIWindow *window = [self getTopApplicationWindow];
    // get the root view controller for the top most window
    UIViewController *vc = window.rootViewController;
  while (vc.presentedViewController != nil)
     {
        vc = vc.presentedViewController;
     }
    return vc;
  }
 -(UIView*)createView{
       CGRect rect = UIScreen.mainScreen.bounds;
       float xAxis = (rect.size.width-100)/2;
       float yAxis = (rect.size.height-100)/2;

       UIView *view = [[UIView alloc] initWithFrame:CGRectMake(xAxis, yAxis, 100, 100)];
        view.backgroundColor = [UIColor redColor];
         return view;
    }
    -(void)addViewToCurrentController{
          NSLog(@"addViewToWindow caled");
          UIView *view = [self createView];
          UIViewController *vc = [self getTopViewController];
          NSLog(@"addViewToWindow caled %@",view);
           [vc.view addSubview:view];
         view = nil;
   }
   @end


  extern "C"{
          double IOSgetElapsedTime(){
              NSLog(@"IOSgetElapsedTime");
             return [[MyNativeClass sharedInstence] getElapsedTime];
           }
         void addViewToController()
           {
              NSLog(@"getaddedViewToWindow caled");
              // calls the method to display our view controller over the unity controller
              [[MyNativeClass sharedInstence] addViewToCurrentController];
            }

      }  // end of extern C block

此后，我在FrameworkBridge中注册了如下相同的方法

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

    public class FrameworkBridge : MonoBehaviour
    {
      #if UNITY_IOS     
      [DllImport ("__Internal")]
       private static extern void switchUserRole (string message);
       [DllImport ("__Internal")]
       private static extern double IOSgetElapsedTime();
       [DllImport ("__Internal")]
       private static extern void addViewToController();
      #endif  

      void Start()
        {
            Debug.Log ("Elapsed Time: " + getElapsedTime());
           // Debug.Log ("View Created: " + ShowMyCustomView());
           //addViewToWindow();
           Debug.Log ("ShowMyCustomView");
           addViewToCurrentController();
           Debug.Log ("ShowMyCustomView");
        }
        int frameCounter = 0;
        // Update is called once per frame
        void Update()
        {
            frameCounter ++;
            if(frameCounter>=5){
              Debug.Log("Tick: " + getElapsedTime());
              frameCounter = 0;
            }

        }
         public static void message(string message) {         
        #if UNITY_IOS
          if (Application.platform == RuntimePlatform.IPhonePlayer) {             
            switchUserRole(message);         
          }         
        #endif
      } 
      double getElapsedTime(){
        if (Application.platform == RuntimePlatform.IPhonePlayer) 
          return IOSgetElapsedTime();
        Debug.LogWarning("Wrong platform!");
        return 0;
      }
      // Now make c# methods that can provide the iOS functionality
      void addViewToCurrentController()
         {
           #if UNITY_IOS
             if (Application.platform == RuntimePlatform.IPhonePlayer)
             {
               Debug.Log("Tick View Created Call");
                     // this calls our native method defined above
                 addViewToCurrentController();
             }
              #endif
         }
    }


    When I have build and run the in iPhone device I got this error 
         Undefined symbols for architecture arm64:
      "_addViewToWindow", referenced from:
      _FrameworkBridge_addViewToWindow_m0B84013F8B64453FEB515019B6E3C8E24F54C8A5 in       Assembly-CSharp.o
         (maybe you meant: _FrameworkBridge_addViewToWindow_m0B84013F8B64453FEB515019B6E3C8E24F54C8A5)
    ld: symbol(s) not found for architecture arm64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

    I have restart Xcode many time, Clean driveData many time. But no luck

或者，如果有人可以帮助我如何在运行时创建自定义UIView。我的意思是，当我的应用构建并运行时，我可以创建一个UIView并通过统一帮助程序类更新该视图颜色。