Flutter Riverpod v1.0 - state 未使用 StateNotifier 列表更新

Question

我从 RiverPod 0.4x 迁移到 1.0 稳定版，现在这个 StateNotifier 不再更新 state 即使在 Z6F1C25ED1523962BEE9 结束时调用move() function （debugPrint 显示调用）。 这在 0.4x 中工作，但显然在改进的 1.0 RiverPod 中我还没有完全迁移。

当 state 是列表时，RiverPod 1.0 更新 state 缺少什么？

final animateCoversStateNotifierProvider = StateNotifierProvider.autoDispose<
    AnimateCoversStateNotifier,
    List<CoverAlignment>>((ref) => AnimateCoversStateNotifier());

class AnimateCoversStateNotifier extends StateNotifier<List<CoverAlignment>> {
  AnimateCoversStateNotifier() : super([]);

  void addCover({
    required CoverAlignment alignment,
  }) =>
      state.add(alignment);

  void move({
    required int cover,
    bool? readyToOpen,
    bool? speechBalloonVisible,
    Duration? animatedOpacityDuration,
    bool? removeSpeechBalloonPadding,
  }) {
    debugPrint('move cover called');
    Future.delayed(const Duration(milliseconds: 200), () {
      if (mounted) {
        state[cover].removeSpeechPadding = speechBalloonVisible != true;
        state[cover].speechBalloonOpacity =
            speechBalloonVisible == true ? kMaxSpeechBalloonOpacity : 0.0;
        state[cover].x = CoverAlignment.randomDouble();
        state[cover].y = CoverAlignment.randomDouble();
        state[cover].curve = CoverAlignment.getCurve();
        state[cover].seconds = CoverAlignment.randomSeconds();
        state[cover].degrees = CoverAlignment.randomIntInRangeWithMinimum(
          min: 0,
          max: 45,
        );
        /// This was required to update state using RiverPod 0.4x, but no longer works in 
        /// RiverPod 1.0.
        state = state;
      }
    });
  }
}

在我的构建屏幕主体中，我使用watch来响应通知者的更改。

/// Display covers
final List coverAlignment =
    ref.watch(animateCoversStateNotifierProvider);

Answer 1

正在做：

state = state

从来不应该工作。

你不应该改变现有的 state。 你应该克隆 state

相反，请执行以下操作：

state[cover] = state[cover].copyWith(
  removeSpeechPadding: speechBalloonVisible != true,
  ...
),

您可以使用Freezed生成此copyWith方法