flatter:在小部件从小部件树中移除时,或者在其生命周期结束时,为小部件设置动画?

你可以试试这个酒吧 https://pub.flutter-io.cn/packages/auto_animated . 您可以将您的自定义动画与此酒吧结合起来,并能够达到所需的行为。

// With predefined options
LiveGrid.options(
  options: options,

  // Like GridView.builder, but also includes animation property
  itemBuilder: buildAnimatedItem,

  // Other properties correspond to the `ListView.builder` / `ListView.separated` widget
  itemCount: itemsCount,
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
    crossAxisCount: 3,
    crossAxisSpacing: 16,
    mainAxisSpacing: 16,
  ),
);

构建动画编辑器 可以自定义动画,您可以这样定义:

Widget buildAnimatedItem(
  BuildContext context,
  int index,
  Animation<double> animation,
) =>
  // For example wrap with fade transition
  FadeTransition(
    opacity: Tween<double>(
      begin: 0,
      end: 1,
    ).animate(animation),
    // And slide transition
    child: SlideTransition(
      position: Tween<Offset>(
        begin: Offset(0, -0.1),
        end: Offset.zero,
      ).animate(animation),
      // Paste you Widget
      child: YouWidgetHere(),
    ),
  );