Error "_reactNative.Backhander.removeEventListener is not a function"

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used [patch-package](https://github.com/ds300/patch-package) to patch `native-base@3.4.28` for the project I'm working on.

I got the error "_reactNative.Backhander.removeEventListener is not a function"

Here is the diff that solved my problem:

```diff
diff --git a/node_modules/native-base/src/hooks/useKeyboardDismissable.ts b/node_modules/native-base/src/hooks/useKeyboardDismissable.ts
index f3cfa44..af443fa 100644
--- a/node_modules/native-base/src/hooks/useKeyboardDismissable.ts
+++ b/node_modules/native-base/src/hooks/useKeyboardDismissable.ts
@@ -48,12 +48,17 @@ export function useBackHandler({ enabled, callback }: IParams) {
callback();
return true;
};
+ let subscription: any;
if (enabled) {
- BackHandler.addEventListener('hardwareBackPress', backHandler);
- } else {
- BackHandler.removeEventListener('hardwareBackPress', backHandler);
+ subscription = BackHandler.addEventListener(
+ 'hardwareBackPress',
+ backHandler
+ );
}
- return () =>
- BackHandler.removeEventListener('hardwareBackPress', backHandler);
+ return () => {
+ if (subscription && typeof subscription.remove === 'function') {
+ subscription.remove();
+ }
+ };
}, [enabled, callback]);
}
```

This issue body was [partially generated by patch-package](https://github.com/ds300/patch-package/issues/296).

Start in node_modules/native-base/src/hooks/useKeyboardDismissable.ts and inspect the useBackHandler cleanup around React Native's BackHandler API. Reproduce the error with native-base@3.4.28, then verify that enabling and disabling the hook no longer calls the missing removeEventListener method and that the reported error is gone.

Written by the indexing model from the issue text.