@fruits-chain/react-native-xiaoshu/lib/module/helpers/color.js

React Native UI library

/**
 * 16 进制颜色转 rgba
 * @param color 16 进制颜色
 * @param transparency 透明度 0~1
 */
export const hex2rgba = function (color) {
  let transparency = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0.8;
  const reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
  let sColor = color.toLowerCase(); // 如果是16进制颜色

  if (sColor && reg.test(sColor)) {
    if (sColor.length === 4) {
      let sColorNew = '#';

      for (let i = 1; i < 4; i += 1) {
        sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1));
      }

      sColor = sColorNew;
    } // 处理六位的颜色值


    const sColorChange = [];

    for (let i = 1; i < 7; i += 2) {
      // eslint-disable-next-line radix
      sColorChange.push(parseInt('0x' + sColor.slice(i, i + 2)));
    }

    return `rgba(${sColorChange.join(',')},${transparency})`;
  }

  return sColor;
};
/**
 * convert hex format to a rgb color, opacity of rgba is ignored
 */

export const rgb2hex = rgb => {
  const colors = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i);
  return colors && colors.length === 4 ? '#' + ('0' + parseInt(colors[1], 10).toString(16)).slice(-2) + ('0' + parseInt(colors[2], 10).toString(16)).slice(-2) + ('0' + parseInt(colors[3], 10).toString(16)).slice(-2) : '';
};
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