请帮我解决这个问题:有“箭头”组件会改变父组件的父组件的状态。一般父级的状态影响渲染它的子级。当我使用类时,我的应用程序运行良好。但是,如果我尝试使用 Hooks,它会出乎意料地工作:一般父级的状态会立即更改,但不会执行重新渲染子级。你能告诉我有什么问题吗? (代码已经简化)
带类:
//general parent component
export default class Container extends React.Component {
constructor(props) {
super(props);
this.state = { page: 5 };
this.nextPage = this.nextPage.bind(this);
}
nextPage() {
let currentPage = this.state.page;
this.setState({ page: currentPage +1});
}
render() {
return (
<List
onPageUp={this.nextPage}
statePage={this.state.page}
/>
);
}
}
//child
export default class List extends React.Component {
constructor(props) {
super(props);
}
render() {
const thisPage = this.props.statePage;
/*here's the calculations depending on thisPage*/
return (
<View>
<ArrowRight onPageUp={this.props.onPageUp} />
<SomeView />
</View>
);
}
}
//right arrow - child of the child
export default class ArrowRight extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<View>
<TouchableOpacity
onPress={() => this.props.onPageUp()}
>
</TouchableOpacity>
</View>
)
}
}
带钩子:
//general parent component
export default function Container() {
const [page, setPage] = useState(5);
const nextPage = () => {
let currentPage = page;
setPage(currentDate + 1);
}
return (
<View>
<List
statePage={page}
nextPage={nextPage}
/>
</View>
);
}
//child
export default function List (props) {
const thisPage = props.statePage;
/*here's the calculations depending on thisPage*/
return (
<View>
<ArrowRight nextPage={props.nextPage} />
<SomeView />
</View>
}
//right arrow - child of the child
export default function ArrowRight(props) {
return (
<View>
<TouchableOpacity
onPress={() => props.nextPage()}
>
</TouchableOpacity>
</View>
)
}