How does Flutter handle platform-specific UI on Android and iOS?
Why Interviewers Ask This
Senior Flutter engineers are expected to reason about architecture, performance, and edge cases. This question separates mid-level from senior candidates by testing deep system-level understanding.
Answer
Flutter renders its own widgets on its own canvas using Skia/Impeller — it does NOT use native platform widgets. This means a Flutter app looks identical on Android and iOS by default. To follow platform conventions, Flutter provides separate widget sets: Material widgets follow Android/Google design guidelines, and Cupertino widgets follow iOS design guidelines. You can use Platform.isIOS or defaultTargetPlatform to conditionally render different widgets. For embedding native views (like Maps or WebView), use PlatformView or established plugins.
Pro Tip
Before answering, structure your response: one-line definition → real-world analogy → concrete example from a project. This makes even complex Flutter answers easy to follow.
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