import React, {Component} from "react"; import {View,Text} from "react-native"; import FlipCard from "react-native-flip-card-view"  export default class Demo extends Component {   render = () => {     return (       <FlipCard style={{flex: 1}}                     velocity={2} // Velocity makes it move                     tension={5} // Slow                     friction={1} // Oscillate a lot                     renderFront={this._renderFront()}                      renderBack={this._renderBack()}/>     );   };   //Desired screen view method in front page   _renderFront() {         return (             <View style={{backgroundColor: 'red',flex:1,height:100}}>                 <Text>Hello front page</Text>             </View>);     }   //Desired screen view method in back page     _renderBack() {         return (             <View style={{backgroundColor: 'blue',flex:1,height:100}}>                 <Text>Hello back page</Text>             </View>);     }   }