flutter-layout - 如何防止 setState((){}); 颤抖？

Question

` setState(() { //这里如何防止设置状态 rating = aaa; });

onChanged: (aaa) {
   setState(() {
    rating = aaa;
   });
},`

Answer 1

您可以使用 ValueListenableBuilder 代替 setState。例如：如果 rating 是 int 类型。因此，您可以创建一个 int 类型的 ValueNoifier 并监听它的变化。

 ValueNotifier<int> rating = ValueNotifier<int>(0);

//......change the value of rating in the onChanged:

 onChanged(aaa){
  rating.value = aaa;
 }

// .... Wrap your Widget with Listenable builder to listen to the change in rating.

ValueListenableBuilder(
valueListenable: rating,
builder : (context, value, child) => SomeWidget(......)
)