标签：scale fw 适配 app height react width let fh

import React, {
  Component,
  PropTypes
} from 'react';
import {
  Dimensions,
  PixelRatio,
  Platform,
  StatusBar,
  View
} from 'react-native';

let props = {};
export default class Resolution {
  static get(useFixWidth = true) {
    return useFixWidth ? {
      ...props.fw
    } : {
      ...props.fh
    }
  }

  static setDesignSize(dwidth = 750, dheight = 1336, dim = "window") {
    let designSize = {
      width: dwidth,
      height: dheight
    };

    let navHeight = Platform.OS === 'android' ? StatusBar.currentHeight : 0;
    let pxRatio = PixelRatio.get(dim);
    let {
      width,
      height
    } = Dimensions.get(dim);
    if (dim != "screen") height -= navHeight;
    let w = PixelRatio.getPixelSizeForLayoutSize(width);
    let h = PixelRatio.getPixelSizeForLayoutSize(height);

    let fw_design_scale = designSize.width / w;
    fw_width = designSize.width;
    fw_height = h * fw_design_scale;
    fw_scale = 1 / pxRatio / fw_design_scale;

    let fh_design_scale = designSize.height / h;
    fh_width = w * fh_design_scale;
    fh_height = designSize.height;
    fh_scale = 1 / pxRatio / fh_design_scale;

    props.fw = {
      width: fw_width,
      height: fw_height,
      scale: fw_scale,
      navHeight
    };
    props.fh = {
      width: fh_width,
      height: fh_height,
      scale: fh_scale,
      navHeight
    };

    console.log("winSize", JSON.stringify({
      width,
      height
    }))
    console.log("winPixelSize", JSON.stringify({
      width: w,
      height: h
    }))
    console.log("pxRatio", pxRatio)
    console.log("fixWidth", JSON.stringify(props.fw))
    console.log("fixHeight", JSON.stringify(props.fh))
  }

  static FixWidthView = (p) => {
    let {
      width,
      height,
      scale,
      navHeight
    } = props.fw;
    return ( <
      View {
        ...p
      }
      style = {
        [p.style, {
          marginTop: navHeight,
          width: width,
          height: height,
          transform: [{
              translateX: -width * .5
            },
            {
              translateY: -height * .5
            },
            {
              scale: scale
            },
            {
              translateX: width * .5
            },
            {
              translateY: height * .5
            }
          ]
        }]
      }
      />
    );
  };

  static FixHeightView = (p) => {
    let {
      width,
      height,
      scale,
      navHeight
    } = props.fh;
    return ( <
      View {
        ...p
      }
      style = {
        [p.style, {
          marginTop: navHeight,
          width: width,
          height: height,
          transform: [{
              translateX: -width * .5
            },
            {
              translateY: -height * .5
            },
            {
              scale: scale
            },
            {
              translateX: width * .5
            },
            {
              translateY: height * .5
            }
          ]
        }]
      }
      />
    );
  };
};
//init
Resolution.setDesignSize();

标签：scale,fw,适配,app,height,react,width,let,fh
来源： https://www.cnblogs.com/fanzhen/p/12497637.html

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