Added Back Button Functionality

[Vigneshpillai19]

Default behaviour of Back button will be exiting the App and User can pass his own function as a prop for custom behaviour of the component.

[vikrantnegi]

Thanks for the PR. I'll test it out before merging.

[Vigneshpillai19]

Okay Thanks

[Vigneshpillai19]

Have you checked my Code?
Is it working properly?

[vikrantnegi]

'Backhandler' is not defined

Typo error.

[vikrantnegi]

'backButtonPress' is not defined.

[Vigneshpillai19]

backButtonPress is defined

[vikrantnegi]

@Vigneshpillai19

Please check the comments I've made. and update the PR. Also, make sure the code works properly on both iOS and Android. It doesn't seems to working properly.

Thanks.

[Vigneshpillai19]

Thanks for Checking my Code and informing me about the mistake.
There was a small spelling mistake in BackHandler function name which I Corrected now.
This functionality of exiting App will work for Android only as BackHandler works for only Android and for IOS we have to install (react-native-exit-app) module and add it in gradle file so for IOS I have not added any default behaviour.
Both Android and IOS users can pass customised function as a prop (backButtonPress) which will get executed on pressing the back button. So I guess this can work on both the Platforms but default behaviour of exiting App will work only on Android.

Thank You for giving your time in checking my Code.