如何动态修改SimpleScrollView的backgroundColor？ 以及如何在反应原生中获取DOM？
// SimpleScrollView
const NUM_ITEMS=20;
class SimpleScrollView extends React.Component{
static title= '<ScrollView>';
static description='Component';
itemClick(){
//how to dynamically modify SimpleScrollView's backgroundColor
}
makeItem(itemsCount:number,itemStyles):Array<any>{
let newItems=[];
for(let i=0;i<itemsCount;i++){
newItems[i]=(<TouchableOpacity key={i} style={itemStyles} onPress={()=>this.itemClick()}>
<Text >{'item'+i}</Text>
</TouchableOpacity>
);
}
return newItems;
}
render(){
let items=this.makeItem(NUM_ITEMS,styles.itemWrapper);
items[5]=(
<ScrollView key={'scrollView'} horizontal={true} >
{this.makeItem(NUM_ITEMS,[styles.itemWrapper,styles.horizontalItemWrapper])}
</ScrollView>
);
let verticalScrollView=(
<ScrollView style={styles.verticalScrollView}>
{items}
</ScrollView>
);
return verticalScrollView;
}
}
var styles = React.StyleSheet.create({
verticalScrollView: {
margin: 10,
},
itemWrapper: {
alignItems:'center',
backgroundColor: '#dddddd',
borderRadius: 5,
borderWidth: 5,
borderColor: '#a52a2a',
padding: 20,
margin: 5,
},
horizontalItemWrapper: {
padding: 20
},
});