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这个 PR 解决了 #456。该问题的原因是课评详情页面与论坛帖子页面不同,
PagedListView
在FutureWidget
中动态创建,build()
时可能对应的PagedListView
根本还未创建,因此_state
没有绑定。该 PR 将其移动到
PagedListView
创建时的帧结束时执行。