/**
* Sample React Native App
* https://github.com/facebook/react-native
* @flow
*/
import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
InteractionManager,
PixelRatio
} from 'react-native';
export default class D20170504 extends Component {
render() {
return (
{
//3
alert(PixelRatio.get());
}}>{'像素密度'}
{
alert(PixelRatio.getPixelSizeForLayoutSize(200));
}}>{'通过逻辑像素来计算物理的像素'}
{
alert(PixelRatio.getFontScale());
}}>{'获得字体缩放的比例'}
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
AppRegistry.registerComponent('D20170504', () => D20170504);
