Platform Specific

react-native in essence aims to provide an umbrella platform for both iOS and android. This seems like a dream combo, but contrary to what you may want in web development, in mobile development android and iOS have platform specific behaviors as well and they are not considered bugs.

react-native bridges the gap by implementing some specific features on iOS and android, and also gives you access to platform detection for implementing different beahvior when on one platform or another.(For example some styles may look differently on iOS and android)

• sharing to other apps is different, share link to email for example
• permissions are different
• default maps are different and react-native allows you to specify which to use

The docs reference specific UI features that are specific to either iOS or android. The idea is that you should provide an experience that is seamless for users of both platforms.