Reactjs React Native FlatList onViewableItemsChanged回调在状态更改后遇到错误重新加载
我需要设置状态以检测当前视口中的哪个项目可见。为此,我编写了以下代码:Reactjs React Native FlatList onViewableItemsChanged回调在状态更改后遇到错误重新加载,reactjs,react-native,react-native-flatlist,Reactjs,React Native,React Native Flatlist,我需要设置状态以检测当前视口中的哪个项目可见。为此,我编写了以下代码: const [inViewPort, setInViewPort] = useState(0); const viewabilityConfig = { viewAreaCoveragePercentThreshold: 30, }; const onViewableItemsChanged = ({viewableItems, changed}) => { if (changed && c
const [inViewPort, setInViewPort] = useState(0);
const viewabilityConfig = {
viewAreaCoveragePercentThreshold: 30,
};
const onViewableItemsChanged = ({viewableItems, changed}) => {
if (changed && changed.length > 0) {
setInViewPort(changed[0].index);
}
};
return (
<SafeAreaView style={styles.container}>
<FlatList
data={myData}
renderItem={renderItem}
showsHorizontalScrollIndicator={false}
keyExtractor={(_, index) => index.toString()}
horizontal={true}
onViewableItemsChanged={onViewableItemsChanged}
viewabilityConfig={viewabilityConfig}
/>
</SafeAreaView>
);
const[inViewPort,setInViewPort]=useState(0);
常量可视性配置={
ViewArea覆盖率百分比阈值:30,
};
const onViewableItemsChanged=({viewableItems,changed})=>{
如果(已更改&&changed.length>0){
setInViewPort(已更改[0]。索引);
}
};
返回(
index.toString()}
水平={true}
onViewableItemsChanged={onViewableItemsChanged}
viewabilityConfig={viewabilityConfig}
/>
);
onViewableItemsChanged事件回调会正确触发,但在我调用setInViewPort后,组件会更新,并重新引发以下错误:
不变冲突:不支持动态更改OnViewableItemsAnged
我一直在寻找相同的答案,但没有明确的例子。我就是这样解决的
const [inViewPort, setInViewPort] = useState(0)
const viewabilityConfig = useRef({
itemVisiblePercentThreshold: 50,
waitForInteraction: true,
minimumViewTime: 5,
})
const onViewableItemsChanged = React.useRef(({ viewableItems, changed }) => {
if (changed && changed.length > 0) {
setInViewPort(changed[0].index);
}
})
return (
<SafeAreaView style={styles.container}>
<FlatList
data={myData}
renderItem={renderItem}
showsHorizontalScrollIndicator={false}
keyExtractor={(_, index) => index.toString()}
horizontal={true}
onViewableItemsChanged={onViewableItemsChanged.current}
viewabilityConfig={viewabilityConfig.current}
/>
</SafeAreaView>
)
const[inViewPort,setInViewPort]=useState(0)
const viewabilityConfig=useRef({
itemVisiblePercentThreshold:50,
waitForInteraction:是的,
最小查看时间:5,
})
const onViewableItemsChanged=React.useRef({viewableItems,changed})=>{
如果(已更改&&changed.length>0){
setInViewPort(已更改[0]。索引);
}
})
返回(
index.toString()}
水平={true}
onViewableItemsChanged={onViewableItemsChanged.current}
viewabilityConfig={viewabilityConfig.current}
/>
)
我一直在寻找相同的答案,但没有明确的例子。我就是这样解决的
const [inViewPort, setInViewPort] = useState(0)
const viewabilityConfig = useRef({
itemVisiblePercentThreshold: 50,
waitForInteraction: true,
minimumViewTime: 5,
})
const onViewableItemsChanged = React.useRef(({ viewableItems, changed }) => {
if (changed && changed.length > 0) {
setInViewPort(changed[0].index);
}
})
return (
<SafeAreaView style={styles.container}>
<FlatList
data={myData}
renderItem={renderItem}
showsHorizontalScrollIndicator={false}
keyExtractor={(_, index) => index.toString()}
horizontal={true}
onViewableItemsChanged={onViewableItemsChanged.current}
viewabilityConfig={viewabilityConfig.current}
/>
</SafeAreaView>
)
const[inViewPort,setInViewPort]=useState(0)
const viewabilityConfig=useRef({
itemVisiblePercentThreshold:50,
waitForInteraction:是的,
最小查看时间:5,
})
const onViewableItemsChanged=React.useRef({viewableItems,changed})=>{
如果(已更改&&changed.length>0){
setInViewPort(已更改[0]。索引);
}
})
返回(
index.toString()}
水平={true}
onViewableItemsChanged={onViewableItemsChanged.current}
viewabilityConfig={viewabilityConfig.current}
/>
)
这是否回答了您的问题?这回答了你的问题吗?