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两个毛病 #33

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dev-johnny-gh opened this issue Aug 1, 2020 · 1 comment

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dev-johnny-gh commented Aug 1, 2020

现在RexProvider在useEffect里面去开始订阅变更，但是RexProvider又在最外层，所以它的useEffect最晚触发，所以在渲染时，子组件对store的更新，都会丢失。除非在子组件里使用setTimeout进行延时，等RexProvider的useEffect生效，但这个比较挫。
第二，更新时，没有callback，例如this.setState，会有一个callback，来通知这个更新已经完成，可以做下一步。现在调用store.update()，没有一个callback可以知道rex已经渲染完成。

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dev-johnny-gh commented Aug 1, 2020 •

edited

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对于第一个问题，比较复杂，我还没想清楚。
第二个问题可能可以用useState解决

const RexProvider = (props) => {
  const [store, setStore] = useState();

  useEffect(() => {
      props.callback(store);
  }, [store]);
}

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