App.js

import React from "react";
import { StyleSheet, Text, View } from "react-native";
import { createAppContainer } from "react-navigation";
import { createBottomTabNavigator } from "react-navigation-tabs";
import TransactionScreen from "./screens/BookTrs";
import SearchScreen from "./screens/SearchScreen";
export default class App extends React.Component {
  render() {
    return <AppContainer />;
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center",
  },
});

const TabNavigator = createBottomTabNavigator({
  Transaction: TransactionScreen,
  Search: SearchScreen,
});
const AppContainer = createAppContainer(TabNavigator);