closes #1

Solves flickering issue under iOS

Author: alvaromb

lib/ImageBrowser.js

@@ -2,7 +2,13 @@
 
 import React from 'react'
 import PropTypes from 'prop-types'
-import { Modal, Animated, StyleSheet, SafeAreaView } from 'react-native'
+import {
+  Modal,
+  Platform,
+  Animated,
+  StyleSheet,
+  SafeAreaView
+} from 'react-native'
 import ImageListContainer from './ImageListContainer'
 import ImageViewer from './ImageViewer'
 
@@ -104,7 +110,7 @@ class ImageBrowser extends React.Component<Props, State> {
             <Modal
               visible={true}
               transparent={true}
-              animationType='fade'
+              animationType={Platform.OS === 'ios' ? 'none' : 'fade'}
               onRequestClose={this.closeImageViewer}
             >
               <ImageViewer