Is React Native fully compatible between Android and iOS?

When porting a React Native application originally built for Android to iOS, you'll quickly discover that the two platforms are not fully compatible — even with React Native's cross-platform promise. Here are the practical challenges we encountered and how we solved them.

Android Only Components

Avoid platform-specific components like ToolbarAndroid and ToastAndroid. Instead, wrap Android-specific components behind your own component to centralize changes and enable future platform flexibility.

// Toast.js
import { ToastAndroid } from 'react-native'
export default ToastAndroid

This abstraction means that when you later need to support iOS, you only change one file.

Custom Fonts

Font handling differs significantly between platforms. Android recognizes fonts by filename, while iOS uses the font's "real name." The solution involves creating a constants file with platform-specific values:

// fonts.js
import { Platform } from 'react-native'
export default {
  MAIN: Platform.OS === 'ios' ? 'IOS name' : 'android_name',
  HINT: Platform.OS === 'ios' ? 'IOS name' : 'android_name',
}

Centralizing font, color, and similar constants in one location supports maintainability across future changes.

Touchables and Negative Margins

Transparent images with negative margins caused input detection failures on iOS when covering touchable elements. The fix involves reordering views so touchables appear last and using only necessary dimensions for layout purposes rather than full-line spans.

Additional Considerations

• Install native dependencies correctly for both platforms
• Handle iOS status bar differences with reusable components
• Optimize performance — avoid unconstrained ListView heights
• Centralize platform-specific code to minimize the surface area of cross-platform differences

Conclusion

iOS and Android lack complete compatibility under React Native, but the differences remain manageable when addressed proactively through best practices and component architecture. The framework remains viable for most cross-platform projects.