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[英]React, passing state setter (useState) to child component with TypeScript
[英]type useState setter in child component
我正在尝试将useState
设置器传递给子组件,但不确定如何输入。
const Parent = () => {
const [count, setCount] = useState(0);
return(
Child count={count} setCount={setCount} />
);
}
然后在Child
组件中,我尝试输入设置器,但我看到以下错误。
类型 'Dispatch< SetStateAction< string[] > >' 不可分配给类型 '() => void'。
我的代码看起来像这样
type Props = {
count: number;
// the issue is the line below
setCount: () => void;
}
const Child = ({ count, setCount }: Props) => {
.... code here
}
您可以指定setCount
prop 函数需要一个数字作为第一个参数,错误就会消失。
type Props = {
count: number;
setCount: (num: number) => void;
}
const Parent = () => {
const [myState, setMyState] = useState<YourType>({});
return(
Child myState={myState} setMyState={setMyState} />
);
}
import { Dispatch, SetStateAction } from 'react'
type Props = {
count: AnyType;
setCount: Dispatch<SetStateAction<YourType>>;
}
const Child = ({ myState, setMyState }: Props) => {
// works with
setMyState(newState)
// also with
setMyState(oldState => {
// ...
return newState
})
}
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