How does Flutter build apps for iOS and Android?

 

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Flutter is an open-source UI toolkit developed by Google that allows developers to build natively compiled applications for iOS, Android, and other platforms from a single codebase. It’s known for its fast performance, expressive UI, and smooth developer experience.

How Flutter Builds Apps for iOS and Android

1. Single Codebase, Multiple Platforms

  • Flutter uses the Dart programming language.

  • Developers write the app once, and Flutter compiles it into native code for both Android and iOS.

  • This eliminates the need to write and maintain separate codebases for each platform.

2. Rendering Engine (Sika)

  • Flutter uses its own high-performance rendering engine called Skia.

  • Instead of relying on platform-native UI components, Flutter draws everything from scratch—buttons, text, animations, etc.

  • This ensures the app looks and behaves the same across both Android and iOS.

3. Widgets and UI Framework

  • Flutter provides a rich set of customizable widgets that mimic native design:

    • Material Design widgets for Android

    • Cupertino widgets for iOS

  • These widgets are optimized for both platforms, offering a consistent user experience with platform-specific look and feel.

4. Compilation to Native Code

  • For Android, Flutter compiles Dart code into native ARM or x86 code using the Dart VM and Android SDK.

  • For iOS, it uses Ahead-of-Time (AOT) compilation to produce native ARM code with the iOS SDK.

  • This results in high performance and smooth animations.

5. Platform Channels for Native Features

  • Flutter uses platform channels to communicate with native (Java/Katlin for Android, Swift/Objective-C for iOS) code.

  • This allows Flutter apps to access device-specific features like GPS, camera, Bluetooth, etc

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