@td-design/react-native/lib/module/helpers/index.js

react-native UI组件库

import { Platform } from 'react-native';
import { deviceHeight, deviceWidth, ONE_PIXEL, px } from './normalize';
import renderNode from './renderNode';

/**
 * 判断是否是IOS系统
 */
const isIOS = Platform.OS === 'ios';

/**
 * 根据条件决定样式是否生效
 * @param condition
 * @param style
 */
const conditionalStyle = (condition, style) => condition ? style : {};
function hexToRgba(hex) {
  let alpha = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
  let c;
  if (/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex)) {
    let arr = hex.substring(1).split('');
    if (arr.length == 3) {
      arr = [arr[0], arr[0], arr[1], arr[1], arr[2], arr[2]];
    }
    c = '0x' + arr.join('');
    return 'rgba(' + [c >> 16 & 255, c >> 8 & 255, c & 255].join(',') + `,${alpha})`;
  }
  throw new Error('Bad Hex');
}
export default {
  renderNode,
  px,
  deviceWidth,
  deviceHeight,
  ONE_PIXEL,
  isIOS,
  conditionalStyle,
  hexToRgba
};
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