如何为当前位置添加地图视图标记

Question

state = {
mapRegion: null,
hasLocationPermissions: false,
locationResult: null,    
location:null
};
componentDidMount() {
this._getLocationAsync();
}
_handleMapRegionChange = mapRegion => {
console.log(mapRegion);
this.setState({ mapRegion });
};
_getLocationAsync = async () => {
  let { status } = await Permissions.askAsync(Permissions.LOCATION);
 if (status !== 'granted') {
 this.setState({
   locationResult: 'Permission to access location was denied',    
  });
  } else {
 this.setState({ hasLocationPermissions: true });
  }
  let location = await Location.getCurrentPositionAsync({});
   this.setState({ locationResult: JSON.stringify(location) });

       // Center the map on the location we just fetched.
   this.setState({mapRegion: { latitude: location.coords.latitude, 
    longitude: 
 location.coords.longitude, latitudeDelta: 0.0922, longitudeDelta: 0.0421 
 }});
   };
       render() {
       return (
         <View  style={styles.container}>  
          {
      this.state.locationResult === null ?
      <Text>Finding your current location...</Text> :
      this.state.hasLocationPermissions === false ?
        <Text>Location permissions are not granted.</Text> :
        this.state.mapRegion === null ?
        <Text>Map region doesn't exist.</Text> :
        <MapView
        style={styles.container}
          region={this.state.mapRegion}
          onRegionChange={this._handleMapRegionChange}
        />
    }
    <MapView.Marker
    coordinate={this.state.location}
    title="My Marker"
    description="Some description"
  />
     {/* <Text>
      Location: {this.state.locationResult}
    </Text> */}
  </View>

   );
    }
     }

我想为当前位置添加mapview.marker。在这里，我正在获取具有当前纬度经度的mapview。现在，我想添加mapviewMarker 我尝试添加mapviewmarker，但是在由：AIRMapMarker管理的视图的属性“坐标”中出现错误，例如错误