title: IOS: React-Native-Maps Marker not appearing
body: <p>I am doing basic marker example and marker does not appear on screen, i can only see screen with map appearing properly but without marker.</p>
  <pre class="lang-js prettyprint-override"><code>function Screen (props) {
    return (
      &lt;SafeAreaView style={styles.view} &gt;
        &lt;View style={styles.container} &gt;
          &lt;MapView style={styles.map} region={{latitude: 0, longitude: 0, latitudeDelta: 0.015, longitudeDelta: 0.0121}}&gt;
            &lt;Marker coordinate={{latitude: 0, longitude: 0}} /&gt;
          &lt;/MapView&gt;
        &lt;/View&gt;
      &lt;/SafeAreaView&gt;
    )
  }
  
  const styles = StyleSheet.create({
    view: {
      flex: 1,
      justifyContent: 'center',
      alignItems: 'center'
    },
    container: {
      flex: 1,
      height: '100%',
      width: '100%',
      justifyContent: 'center',
      alignItems: 'center'
    },
    map : {
      ...StyleSheet.absoluteFillObject
    }
  })
  </code></pre>
  <p>Version:</p>
  <ul>
  <li><code>react-native</code>: 0.69.</li>
  <li><code>react-native-maps</code>: 0.31.1.</li>
  </ul>