问题描述
我有一个SingleChildScrollView小部件，其子级是Flutter中的Form小部件.每当我对表单中的单选按钮或开关进行一些更改并调用setState()方法时，视图就会滚动到顶部.如何避免这种行为?
I have a SingleChildScrollView widget whose child is a Form widget in Flutter. Whenever I made some changes to the radio buttons or switches inside the form and calling setState() method, the view scrolls to the top.How can I avoid this behavior?
推荐答案
我建议在构造SingleChildScrollView小部件时通过自定义ScrollController.
I would recommend passing through a custom ScrollController when constructing your SingleChildScrollView widget.
ScrollController具有一个名为"keepScrollOffset"的属性，您需要将其设置为true.
ScrollController has a property called 'keepScrollOffset' which you need to set to true.
摘自文档，网址为 https://docs.flutter.io/flutter /widgets/ScrollController-class.html
keepScrollOffset→布尔每次滚动完成时，请使用PageStorage保存当前滚动偏移量，如果重新创建了此控制器的可滚动内容，则将其恢复. [...]最终
keepScrollOffset → boolEach time a scroll completes, save the current scroll offset with PageStorage and restore it if this controller's scrollable is recreated. [...]final
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