从React-Native取消视图控制器

Question

在Objective-C项目中提供一个React组件作为视图控制器，然后将该控制器从React-Native中删除。演示部分很简单：

NSURL *jsCodeLocation = [NSURL URLWithString:@"http://localhost:8081/index.bundle?platform=ios"];

    RCTRootView *rootView =
    [[RCTRootView alloc] initWithBundleURL: jsCodeLocation
                                moduleName: @"MyListView"
                         initialProperties:nil
                             launchOptions: nil];
    UIViewController *vc = [[UIViewController alloc] init];
    vc.view = rootView;
    [self presentViewController:vc animated:YES completion:nil];

如何向React Native公开Objective-C类：

RCT_EXPORT_MODULE()

RCT_EXPORT_METHOD(dismiss: (NSString *) name){
    NSLog(@"dismiss");

    dispatch_async(dispatch_get_main_queue(), ^{
        [self dismissViewControllerAnimated:YES completion:nil];
    });
}

如何在React Native中访问此类：

var ViewController = NativeModules.ViewController;

backTap = () => {
    ViewController.dismiss('Blah');
  }

我确实在RCT_EXPORT_METHOD (dismiss:)方法中得到了调用，但是react-native控制器只停留在那里。