将数据从unity3d传递到iOS时，无法推送另一个viewcontroller

Question

我在Unity 3d和iOS之间有一个桥梁来传递数据。我可以使用extern＆＃34; C＆＃34;成功地将数据从unity 3d发送到我的iOS，然后我可以使用extern＆＃34; c＆＃34;的方法调用目标c方法。但是从目标c方法来看，如果我想推送另一个viewcontroller，那么它会崩溃并显示以下问题。

A view can only be associated with at most one view controller at a time! View is associated with Clear this association before associating this view with...

我该如何解决这个问题？

这是我的View Controller类：

@implementation ARViewController


- (void)viewDidLoad
{
    [super viewDidLoad];

    // Just setting Unity delegates and view to add it as subview for my main view.
    // This allow me to add a UIButton above the UnityView to popViewController or anything i want to make native in iOS.

    unityViewController         = [[UnityDefaultViewController alloc] init];
    unityController             = (UnityAppController*)[[UIApplication sharedApplication] delegate];
    unityViewController.view    = (UIView*)unityController.unityView;

    [viewToUnity addSubview:unityViewController.view];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)gotoAnotherViewController
{

    ViewController *arVC = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ClickVC"];
    [self presentViewController:arVC animated:YES completion:nil];

    dispatch_async(dispatch_get_main_queue(), ^{

    });
}

@end

extern "C" {

    void _NativeMethodName(const char* stringValue)
    {
        [[ARViewController new] gotoAnotherViewController];
        NSLog(@"Passed string value: %s", stringValue);
    }

}