react-native type checking component prop-types

/**

* Create by bamboo on 2018-04-13

*

*/

import React ,{ Component } from 'react' ;

import { View , Text , Button ,} from 'react-native' ;

import PropTypes from 'prop-types' ; //Type checking component

//home

export defaultclassApp extendsComponent {

static propTypes = {

onButtonPress:PropTypes .func , // callback function

}

onButtonPress = () =>{

console. log( ip);

}

render() {

return (

< View >

< Button

onPress= {this. onButtonPress }

title= "Learn More"

color= "#841584"

accessibilityLabel= "Learn more about this purple button"

/>

</ View >

);

}

}