我是新的反应原生,所以我使用第三方库中的一些组件,并尝试尽可能使用反应原生组件。
ReactNative:0.54 NativeBase:2.3.10 ....
我在基于scrollView的Nativebase中的Tabs内遇到问题
0.5
将触发haft方式滚动项目但是当我设置0.5时它不会触发到最后一项的方式它等到滚动到最后一项并触发onEndReach。这是我的代码
检查道具和初始状态
static getDerivedStateFromProps(nextProps) {
const { params } = nextProps.navigation.state;
const getCategoryId = params ? params.categoryId : 7;
const getCategoryIndex = params ? params.categoryIndex : 0;
return {
categoryId: getCategoryId,
categoryIndex: getCategoryIndex,
};
}
state = {
loadCategoryTab: { data: [] },
loadProduct: {},
storeExistId: [],
loading: false,
refreshing: false,
}
loadCategory
componentDidMount() { this.onLoadCategory(); }
onLoadCategory = () => {
axios.get(CATEGORY_API)
.then((res) => {
this.setState({ loadCategoryTab: res.data }, () => {
setTimeout(() => { this.tabIndex.goToPage(this.state.categoryIndex); });
});
}).catch(error => console.log(error));
}
选项卡滑动或单击时检查onChange事件
onScrollChange = () => {
const targetId = this.tabClick.props.id;
this.setState({ categoryId: targetId });
if (this.state.storeExistId.indexOf(targetId) === -1) {
this.loadProductItem(targetId);
}
}
loadProductItem = (id) => {
axios.get(`${PRODUCT_API}/${id}`)
.then((res) => {
/*
const {
current_page,
last_page,
next_page_url,
} = res.data;
*/
this.setState({
loadProduct: { ...this.state.loadProduct, [id]: res.data },
storeExistId: this.state.storeExistId.concat(id),
});
})
.catch(error => console.log(error));
}
当onEndReach被触发时,loadMoreProduct
loadMoreProductItem = () => {
const { categoryId } = this.state;
const product = has.call(this.state.loadProduct, categoryId)
&& this.state.loadProduct[categoryId];
if (product.current_page !== product.last_page) {
axios.get(product.next_page_url)
.then((res) => {
const {
data,
current_page,
last_page,
next_page_url,
} = res.data;
const loadProduct = { ...this.state.loadProduct };
loadProduct[categoryId].data = product.data.concat(data);
loadProduct[categoryId].current_page = current_page;
loadProduct[categoryId].last_page = last_page;
loadProduct[categoryId].next_page_url = next_page_url;
this.setState({ loadProduct, loading: !this.state.loading });
}).catch(error => console.log(error));
} else {
this.setState({ loading: !this.state.loading });
}
}
渲染()
render() {
const { loadCategoryTab, loadProduct } = this.state;
const { navigation } = this.props;
return (
<Container>
<Tabs
// NB 2.3.10 not fix yet need to use `ref` to replace `initialPage`
ref={(component) => { this.tabIndex = component; }}
// initialPage={categoryIndex}
renderTabBar={() => <ScrollableTab tabsContainerStyle={styles.tabBackground} />}
onChangeTab={this.onScrollChange}
// tabBarUnderlineStyle={{ borderBottomWidth: 2 }}
>
{
loadCategoryTab.data.length > 0 &&
loadCategoryTab.data.map((parentItem) => {
const { id, name } = parentItem;
const dataItem = has.call(loadProduct, id) ? loadProduct[id].data : [];
return (
<Tab
key={id}
id={id}
ref={(tabClick) => { this.tabClick = tabClick; }}
heading={name}
tabStyle={styles.tabBackground}
activeTabStyle={styles.tabBackground}
textStyle={{ color: '#e1e4e8' }}
activeTextStyle={{ color: '#fff' }}
>
<FlatList
data={dataItem}
keyExtractor={subItem => String(subItem.prod_id)}
ListEmptyComponent={this.onFirstLoad}
// ListFooterComponent={this.onFooterLoad}
refreshing={this.state.refreshing}
onRefresh={this.handleRefresh}
onEndReachedThreshold={0.5}
onEndReached={() => {
this.setState({ loading: !this.state.loading }, this.loadMoreProductItem);
}}
renderItem={({ item }) => {
const productItems = {
item,
navigation,
};
return (
<ProductItems {...productItems} />
);
}}
/>
// this OnLoadFooter is my tempory show loading without ListFooterComponent but i don't want to show loading outside FlatList hope i will get a help soon
<OnLoadFooter loading={this.state.loading} style={{ backgroundColor: '#fff' }} />
</Tab>
);
})
}
</Tabs>
</Container>
);
}
加载组件
function OnLoadFooter(props) {
if (props.loading) return <Spinner style={{ height: 50, paddingVertical: 10 }} />;
return null;
}
让我解释一下我的过程
StoreExistId: [1,2,3,4]
loadProduct: {
1: {data: [.....]},
2: {data: [.....]},
etc....
}
谢谢高级
一些NativeBase组件使用scrollView。我想它可能是使用ScrollView的ScrollableTab组件?你不应该在ScrollView中使用FlatList,onReachEnd将不起作用。
我面临同样的问题,解决方案是在<FlatList>
内使用<Content>
。有关更多信息,请参阅https://stackoverflow.com/a/54305517/8858217