React Native ScrollView - 如何从另一个子组件按钮滚动到子组件？

Question

我有一个ScrollView的结构，它是一个有5个孩子的父

使用ScrollView的父组件

• COMPONENT1
• COMPONENT2
• Component3
• Component4
• Component5

在Component3中我有一个按钮，按下时应将父组件ScrollView滚动到Component5

像这样的东西

家（父母）

export default class Home extends React.Component {      
    renderComments() {
        return this.state.dataSource.map(item =>
            <CommentDetail key={item.id} comment={item} />
        );
    }

    render() {
        return (
            <ScrollView>      
                <Component1 />
                <Component2 />
                <CentralElements  {...this.state.dataSource} scroll = {this.props.scroll} />
                <Component4 />                  
                <View>
                    {this.renderComments()}
                </View>
            </ScrollView>
        );
    }
}

CentralElements（Component3）

export default class CentralElements extends React.Component {
    constructor(props) {
        super(props);
    }
  
    goToComments= () => {
        this.props.scroll.scrollTo({x: ?, y: ?, animated: true});
     };

    render() {
        return (
            <ScrollView horizontal={true}>
                <TouchableOpacity onPress={this.goToComments}>
                    <Image source={require('../../assets/image.png')} />
                    <Text>Comments</Text>
                </TouchableOpacity>
                ...
                </TouchableOpacity>
            </ScrollView>
        );
    }
};

而评论是Component5，关于如何进行父卷轴的任何想法？我想弄清楚我错过了什么，因为那是我第一次接触到这个。

Answer 1

我做的是...... 在component5中，我在主视图中调用onLayout，然后在父组件中保存x和y。要在组件3中单击滚动到它，请单击i调用使用scrollview ref的父函数滚动到之前存储的值

Component5

    export default class Component5 extends Component {

    saveLayout() {
        this.view.measureInWindow((x, y, width, height) => {
            this.props.callParentFunction(x, y)
        })
    }
    render() {
        return (
            <View ref={ref => this.view = ref} onLayout={() => this.saveLayout()}>

            </View>
        )
    }
}

Component3

export default class Component3 extends Component {

    render() {
        return (
            <View >
                <TouchableOpacity onPress={()=>{this.props.goToComponent5()}}>

                </TouchableOpacity>
            </View>
        )
    }
}

家长：

export default class Parent extends Component {
constructor(props) {
this.goToComponent5=this.goToComponent5.bind(this)
    super(props)
    this.state = {
        x:0,
        y:0,
    }
}

    callParentFunction(x, y) {
        this.setState({ x, y })
    }

    goToComponent5(){
        this.ScrollView.scrollTo({x: this.state.x, y: this.state.y, animated: true});
    }

    render() {
        return (
            <View >
                <ScrollView ref={ref => this.ScrollView = ref}>
                    <Component1 />
                    <Component2 />
                    <Component3 goToComponent5={this.goToComponent5}/>
                    <Component4 />
                    <Component5 callParentFunction={this.callParentFunction}/>
                </ScrollView>
            </View>
        )
    }
}