Strange React挂钩行为，无法从函数中访问新状态

Question

我使用库react-use-modal ，我试图在handleClick函数内部读取confirmLoading的更新值。

handleClick确实读取了执行const [ confirmLoading, setConfirmLoading ] = useState(false)时定义的confirmLoading的第一个值，但是当我在handleOk setConfirmLoading时，它永远不会更新。

我不明白我做错了什么

import { Button, Modal as ModalAntd } from 'antd'
import { useModal } from 'react-use-modal'

export interface ModalFormProps {
    form: React.ReactElement
}

export const ModalForm: React.FC = () => {
    const [ confirmLoading, setConfirmLoading ] = useState(false)
    const { showModal, closeModal } = useModal()

    const handleOk = () => {
        setConfirmLoading(true)
        setTimeout(() => {
            setConfirmLoading(false)
            closeModal()
        }, 1000)
    }

    const handleCancel = () => {
        closeModal()
    }

    const handleClick = () => {             
        showModal(({ show }) => (
            <ModalAntd                  
                onCancel={handleCancel}
                onOk={handleOk}
                title='Title'
                visible={show}
            >
                //  the value of confirmLoading is always the one defined 
                //  with useState at the beginning of the file.
                <p>{confirmLoading ? 'yes' : 'no'}</p>                  
            </ModalAntd>
        ))
    }

    return (
        <div>
            <Button onClick={handleClick}>
                Open Modal
            </Button>
        </div>
    )
}

Answer 1

这是因为关闭而发生的。 传递给showModal的组件会记住confirmLoading ，当您调用函数setConfirmLoading您的组件将再次呈现并重新创建函数handleClick 。 showModal “旧” handleClick和“old”组件对confirmLoading的新值confirmLoading 。

尝试这样做：

export const ModalForm: React.FC = () => {
    const { showModal, closeModal } = useModal();

    const handleClick = () => {

        showModal(({ show }) => {
            const [ confirmLoading, setConfirmLoading ] = useState(false);
            const handleOk = () => {
                setConfirmLoading(true)
                setTimeout(() => {
                    setConfirmLoading(false)
                    closeModal()
                }, 1000)
            };

            const handleCancel = () => {
                closeModal()
            };

            return (
                <ModalAntd
                    onCancel={handleCancel}
                    onOk={handleOk}
                    title='Title'
                    visible={show}
                >
                    // the value of confirmLoading is always the one defined
                    // with useState at the beginning of the file.
                    <p>{confirmLoading ? 'yes' : 'no'}</p>
                </ModalAntd>
            );
        })
    };

    return (
        <div>
            <Button onClick={handleClick}>
                Open Modal
            </Button>
        </div>
    )
}