React Native ScrollView-如何从另一个子组件按钮滚动到一个子组件?

时间:2019-02-28 15:15:45

标签: javascript reactjs react-native components scrollview

我有一个带有ScrollView的结构,该视图是一个有5个孩子的父母

具有ScrollView的父组件

  • Component1
  • Component2
  • Component3
  • Component4
  • Component5

在Component3内部,我有一个按钮,当按下该按钮时,应将父组件ScrollView滚动到Component5

类似这样的东西

家庭(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>
        );
    }
};

注释是Component5,有关如何滚动父级的任何想法? 我试图弄清楚自己所缺少的是什么,因为那是我第一次与之联系。

1 个答案:

答案 0 :(得分:0)

我所做的是..
在component5中,我在主视图中调用onLayout,然后将xy保存在父组件中。 要在组件3上单击以滚动到它,请调用父函数,该函数使用scrollview ref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>
        )
    }
}

父母:

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>
        )
    }
}