[英]react-native-maps Cannot ref the MapView in Stateless Component
there are a lot of example on how to use react-native-maps in a Class Component but i haven't found those with Stateless Component.有很多关于如何在类组件中使用 react-native-maps 的示例,但我还没有找到带有无状态组件的示例。 I use Stateless Component to access the a global state.
我使用无状态组件来访问全局状态。 I need to move the camera view of the MapView from the initial region after i got the user's location , After searching in internet i somehow ends up with this code that is not working.
获得用户位置后,我需要从初始区域移动 MapView 的相机视图,在互联网上搜索后,我不知何故以无法正常工作的代码结束。
import React, { useState, useEffect, useRef } from 'react'
import MapView, { Marker, PROVIDER_GOOGLE } from 'react-native-maps';
...
const Explore = props => {
const [userCoords, setUserCoords] = useState({
latitude: 0,
longitude: 0
})
const mapRef = useRef(null);
onMapReady = () => {
getUserLocation()
}
getUserLocation = async () => {
Geolocation.getCurrentPosition(
async (position) => {
setUserCoords(position.coords)
mapRef.animateToRegion({
latitude: position.coords.latitude,
longitude: position.coords.longitude,
})
},
async (error) => {
// See error code charts below.
console.log("Geolocation Error" + error.code, error.message);
},
{ enableHighAccuracy: true, timeout: 15000 }
);
}
return(
...
<MapView
ref={mapRef}
onMapReady={() => onMapReady()}
region={{
latitude: userCoords.latitude,
longitude: userCoords.latitude,
latitudeDelta: 0.0922,
longitudeDelta: 0.0421,
showsUserLocation={true}>
...
</MapView>
)
...
export default Explore
Please help me~ Thank you请帮帮我~谢谢
而不是使用的mapRef.animateToRegion
你需要使用mapRef.current.animateToRegion
there are a lot of example on how to use react-native-maps in a Class Component but i haven't found those with Stateless Component.有很多关于如何在类组件中使用 react-native-maps 的示例,但我还没有找到那些带有无状态组件的示例。 I use Stateless Component to access the a global state.
我使用无状态组件来访问全局状态。 I need to move the camera view of the MapView from the initial region after i got the user's location , After searching in internet i somehow ends up with this code that is not working.
在获得用户的位置后,我需要从初始区域移动 MapView 的相机视图,在互联网上搜索后,我不知何故以无法正常工作的代码结束。
import React, { useState, useEffect, useRef } from 'react'
import MapView, { Marker, PROVIDER_GOOGLE } from 'react-native-maps';
...
const Explore = props => {
const [userCoords, setUserCoords] = useState({
latitude: 0,
longitude: 0
})
const mapRef = useRef(null);
onMapReady = () => {
getUserLocation()
}
getUserLocation = async () => {
Geolocation.getCurrentPosition(
async (position) => {
setUserCoords(position.coords)
mapRef.animateToRegion({
latitude: position.coords.latitude,
longitude: position.coords.longitude,
})
},
async (error) => {
// See error code charts below.
console.log("Geolocation Error" + error.code, error.message);
},
{ enableHighAccuracy: true, timeout: 15000 }
);
}
return(
...
<MapView
ref={mapRef}
onMapReady={() => onMapReady()}
region={{
latitude: userCoords.latitude,
longitude: userCoords.latitude,
latitudeDelta: 0.0922,
longitudeDelta: 0.0421,
showsUserLocation={true}>
...
</MapView>
)
...
export default Explore
Please help me~ Thank you请帮帮我~谢谢
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