英文:
How exactly is RN component rerendered when state changes?
问题
如果 b 被更改，那么 componentB 会重新渲染，但是 ComponentA 会不会重新渲染呢？或者只有当 a 发生变化时 ComponentA 才会重新渲染？
英文:
Let's say I have a global state defined in Redux which consists of an object as:
const data =
{
a: { value: 1, id: 1 },
b: { value: 2, id: 2 }
};
ComponentA defined in one file uses a, componentB defined in another file uses b. If b is changed, componentB is rerendered, but is ComponentA also rerendered? Or ComponentA will only rerender if a changes?
答案1
得分: 2
每个注册监听器以侦听此变量的组件在此变量更改时都会重新渲染
例如
redux
const initiateState =
{
a: { value: 1, id: 1 },
b: { value: 2, id: 2 }
};
componentA
const valueA = useSelector((state) => state.reducer.a)
当a变化时，componentA会重新渲染，b变化时则不会有任何操作。
英文:
every component that register listener to variable this will re-render when this variable change
for example
redux
const initiateState =
{
a: { value: 1, id: 1 },
b: { value: 2, id: 2 }
};
componentA
const valueA = useSelector((state) => state.reducer.a)
when a changed, componentA got re-rendered, b change -> do nothing
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