Lära Custom Page Transitions | Animations and Advanced UI

Definition

Custom page transitions in Flutter let you define how one screen animates to another instead of using the platform’s default navigation animations.

By default, Flutter uses platform-specific transitions, like slide-from-right on Android and Cupertino-style slides on iOS. Creating custom transitions allows you to fade, scale, rotate, or combine effects to better match your app’s branding and improve the overall user experience.

main.dart


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import 'package:flutter/material.dart';

void main() => runApp(CustomTransitionApp());

class CustomTransitionApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Custom Page Transition Demo',
      home: FirstScreen(),
    );
  }
}

class FirstScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('First Screen')),
      body: Center(
        child: ElevatedButton(
          child: Text('Go to Second Screen'),
          onPressed: () {
            Navigator.of(context).push(_createFadeRoute());
          },
        ),
      ),
    );
  }
}

Route _createFadeRoute() {
  return PageRouteBuilder(
    pageBuilder: (context, animation, secondaryAnimation) => SecondScreen(),
    transitionsBuilder: (context, animation, secondaryAnimation, child) {
      return FadeTransition(
        opacity: animation,
        child: child,
      );
    },
  );
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Second Screen')),
      body: Center(
        child: Text('This is the second screen'),
      ),
    );
  }
}

This example uses PageRouteBuilder to create a custom fade transition. The pageBuilder defines the target screen, and transitionsBuilder uses the animation value from 0.0 to 1.0 to drive a FadeTransition, making the new page fade in instead of sliding.

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Can you show me how to implement a custom fade transition in Flutter?

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