React Native

import * as React from 'react';
import {Component} from 'react';
import {View, Text, StyleSheet, TouchableOpacity} from 'react-native';

export default class App extends Component {

 constructor(props){
  super(props)

  this.state = {
   contador : 0,
  }
 }

 _pressedNumber = () => {
  this.setState({
   contator: this.state.contador + 1
  })
 }


 render(){
  return (
   <View style={styles.container}>
     <TouchableOpacity onPress={this._pressedNumber}>
        <Text style={styles.fonte}>{this.state.contador}</Text>
     </TouchableOpacity>
   </View>
  )
 }
}

const styles = StyleSheet.creat({
 container : {
 flex:1,
 justifyContent:"center",
 alignitens:"center",
 backgroundColor: "#333"
 },
 fonte:{
  fontSize:150,
  color:"#fff"
 }
})