Is this a bug report?

(write your answer here)
Yes

Have you read the Contributing Guidelines?

(Write your answer here.)
NO

Environment

Environment:
OS: macOS Sierra 10.12.6
Node: 8.5.0
Yarn: 1.1.0
npm: 5.5.1
Watchman: 4.9.0
Xcode: Xcode 9.1 Build version 9B55
Android Studio: Not Found

Packages: (wanted => installed)
react: 16.0.0-beta.5 => 16.0.0-beta.5
react-native: 0.49.3 => 0.49.3

Steps to Reproduce

(Write your steps here:)

1.i put a rootView in a ios ViewController
2. i push Viewcontroller ,and RCT_EXPORT_MODULE()
3.but i can't pop back because self.navigationController is nil
RNViewController *webVC = [[RNViewController alloc] init]; NSURL *jsCodeLocation = [NSURL URLWithString:@"http://localhost:8081/index.bundle?platform=ios"]; RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL : jsCodeLocation moduleName : @"root" initialProperties : @{@"scores" : @[@{@"name" : @"Alex",@"value": @"42"},@{@"name" : @"Joel",@"value": @"10"}]} launchOptions: nil]; webVC.view = rootView; [self.navigationController pushViewController:webVC animated:YES];

RCT_EXPORT_MODULE() RCT_EXPORT_METHOD(pop) { dispatch_async(dispatch_get_main_queue(), ^{ // JFNavigationController *nav = [UIApplication sharedApplication].keyWindow.rootViewController.childViewControllers[4]; // [nav popViewControllerAnimated:YES]; [self.navigationController popViewControllerAnimated:YES]; }); }

Expected Behavior

i can pop back

(Write what you thought would happen.)

Actual Behavior

it can't pop back

(Write what happened. Add screenshots!)

i create a pure ViewController with of RCT_EXPORT_MODULE() and RCT_EXPORT_METHOD(pop),and i can get self.navigationController,it make me confuse ,what the RCT_EXPORT_MODULE() do ? where i can get my navigationController.

Reproducible Demo

(Paste the link to an example project and exact instructions to reproduce the issue.)