React native map integration

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I am trying to integrate map in react native. I am following the below tutorial. https://github.com/airbnb/react-native-maps

I gone through all the installation instruction. I am using react-native version : 0.44.0 and react-native-map version : 0.13.0 I made sure that react-native-link is linked with android and iOS. While rendering the mapview in ios simulator, map is not showing and only i am able to a blank map with red outline.

Please check my below code and let me know, where i am wrong.

var MapView = require('react-native-maps');
<MapView
    initialRegion={{
    latitude: 37.78825,
    longitude: -122.4324,
    latitudeDelta: 0.0922,
    longitudeDelta: 0.0421,
    }}
/>

Try adding a View and some heights and ...StyleSheet.absoluteFillObject

<View style={{height:400}}>
    <MapView 
         style={{ ...StyleSheet.absoluteFillObject,height:400 }}
         initialRegion={{
             latitude: 37.78825,
             longitude: -122.4324,
             latitudeDelta: 0.0922,
             longitudeDelta: 0.0421,
         }}
    />
</View>

Remember to include your Google Maps API key in the AndroidManifest.xml.

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