flutter pub add flutter_fadein根據套件公開資料產生的選型評估，僅供參考。
一個簡單的 Flutter 小部件，一旦掛載到小部件樹中便會平滑地淡入內容。非常適合透過細微的進入動畫來提升使用者體驗，無需複雜的設定。該小部件會自動處理淡入過渡效果，讓您輕鬆應用於各種 UI 元素。支援所有主要平台，包括 Android、iOS、Web、macOS、Windows 和 Linux，確保在不同裝置上行為一致。適用於引導畫面、動態清單或任何需要溫和出現效果的元件。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
Simple Flutter widget to fade-in your widgets once they are mounted.
Supports Material & Cupertino widgets.
Required Dart >=2.12 (has null-safety support).
Add this as a dependency in your pubspec.yaml:
dependencies:
flutter_fadein: ^2.0.0
import 'package:flutter_fadein/flutter_fadein.dart';
FadeIn(
child: Text("This will be faded-in!"),
// Optional paramaters
duration: Duration(milliseconds: 250),
delay: Duration(milliseconds: 250)
curve: Curves.easeIn,
)
If you need more control over the animation timing, you can use FadeInController:
final controller = FadeInController();
// ...
FadeIn(
child: Text("This will be faded-in with a controller"),
controller: controller,
)
// ...
controller.fadeIn();
controller.fadeOut();
Using a controller with not automatically start. You can make it automatically start using FadeInController(autoStart: true).
Note that the delay parameter does not work while using a controller, and will therefore raise an exception.