Fix errors on my Expo app (for iOS)

I have built an Android App using Expo (react native). It's a pretty basic text-based game. It's running fine on Android devices, but it has couple of errors when running on iPhones. I would like you to fix those errors for iOS: 1. We are using ToastAndroid. As it doesn't exist on iOS, we have to show different kind of messages on iOS. 2. Shaddows on buttons don't look good on iOS, we have to adjust the style to match the Android version 3. When we try to go from one Overlay ([login to view URL]) to another Overlay, we are getting an error on iOS (doesn't open the second Overlay). On Android it works fine. There maybe couple of similar glitches on iOS that should be fixed. You can check the Android app here: [login to view URL]