sangoes-rn-tools/src/fontSize/index.js

react-native-tools rn-tools rn tools

/*
 * @Author: jerrychir 
 * @Date: 2018-08-19 18:51:17 
 * @Last Modified by: jerrychir
 * @Last Modified time: 2018-08-22 11:19:28
 */
const React = require("react-native"); // eslint-disable-line no-undef
const { PixelRatio, Dimensions } = React;

const pixelRatio = PixelRatio.get();
const deviceHeight = Dimensions.get("window").height;
const deviceWidth = Dimensions.get("window").width;

const fontSize = size => {
  if (pixelRatio >= 2 && pixelRatio < 3) {
    // iphone 5s and older Androids
    if (deviceWidth < 360) {
      return size * 0.95;
    }
    // iphone 5
    if (deviceHeight < 667) {
      return size;
      // iphone 6-6s
    } else if (deviceHeight >= 667 && deviceHeight <= 735) {
      return size * 1.15;
    }
    // older phablets
    return size * 1.25;
  } else if (pixelRatio >= 3 && pixelRatio < 3.5) {
    // catch Android font scaling on small machines
    // where pixel ratio / font scale ratio => 3:3
    if (deviceWidth <= 360) {
      return size;
    }
    // Catch other weird android width sizings
    if (deviceHeight < 667) {
      return size * 1.15;
      // catch in-between size Androids and scale font up
      // a tad but not too much
    }
    if (deviceHeight >= 667 && deviceHeight <= 735) {
      return size * 1.2;
    }
    // catch larger devices
    // ie iphone 6s plus / 7 plus / mi note 等等
    return size * 1.27;
  } else if (pixelRatio >= 3.5) {
    // catch Android font scaling on small machines
    // where pixel ratio / font scale ratio => 3:3
    if (deviceWidth <= 360) {
      return size;
      // Catch other smaller android height sizings
    }
    if (deviceHeight < 667) {
      return size * 1.2;
      // catch in-between size Androids and scale font up
      // a tad but not too much
    }
    if (deviceHeight >= 667 && deviceHeight <= 735) {
      return size * 1.25;
    }
    // catch larger phablet devices
    return size * 1.4;
  }
  // if older device ie pixelRatio !== 2 || 3 || 3.5
  else return size;
};

module.exports = fontSize; // eslint-disable-line no-undef