我正在使用react-native-maps显示我所在地区的火车站标记。每个标记都有一个Callout，其中包含接近列车的真实的数据。
问题是;我在Map上的每一个标记的每一个标注都在背景中渲染。此外，每个标注正在重新渲染，因为我有来自真实的API的新数据。这导致数百个视图被渲染，即使我只需要按下的标记的标注。app screenshot
是否有一种方法可以确保在用户按下特定标记之前不会呈现标注？后按;我还想确保只渲染和显示特定标记的标注。
我的代码：
Map屏幕：

const MapScreen = props => {
  // get user location from Redux store
  // this is used to center the map
  const { latitude, longitude } = useSelector(state => state.location.coords)

  // The MapView and Markers are static
  // We only need to update Marker callouts after fetching data
  return(
    <SafeAreaView style={{flex: 1}}>
    <MapView
        style={{flex: 1}}
        initialRegion={{
          latitude:  parseFloat(latitude) || 37.792874,
          longitude: parseFloat(longitude) || -122.39703,
          latitudeDelta: 0.06,
          longitudeDelta: 0.06
        }}
        provider={"google"}
      >
        <Markers />
      </MapView>
      </SafeAreaView>
  )
}

export default MapScreen

标记组件：

const Markers = props => {
  const stationData = useSelector(state => state.stationData)

  return stationData.map((station, index) => {
    return (
      <MapView.Marker
        key={index}
        coordinate={{
          // receives station latitude and longitude from stationDetails.js
          latitude: parseFloat(stationDetails[station.abbr].gtfs_latitude),
          longitude: parseFloat(stationDetails[station.abbr].gtfs_longitude)
        }}
        image={stationLogo}
        zIndex={100}
        tracksInfoWindowChanges={true}
      >
        <MapView.Callout
          key={index}
          tooltip={true}
          style={{ backgroundColor: "#ffffff" }}
        >
          <View style={styles.calloutHeader}>
            <Text style={{ fontWeight: "bold" }}>{station.name}</Text>
          </View>
          <View style={styles.calloutContent}>
            <StationCallout key={index} station={stationData[index]} />
          </View>
        </MapView.Callout>
      </MapView.Marker>
    );
  });
};

StationCallout组件：

const StationCallout = (props) => {
  return(
    props.station.etd.map((route, index) => {
      const approachingTrains = function() {
        trainText = `${route.destination} in`;

        route.estimate.map((train, index) => {
          if (index === 0) {
            if (train.minutes === "Leaving") {
              trainText += ` 0`;
            } else {
              trainText += ` ${train.minutes}`;
            }
          } else {
            if (train.minutes === "Leaving") {
              trainText += `, 0`;
            } else {
              trainText += `, ${train.minutes}`;
            }
          }
        });

        trainText += " mins";

        return <Text>{trainText}</Text>;
      };

      return <View key={index}>
      {approachingTrains()}
      </View>;
    })
  )
};

export default StationCallout