屏幕适配

[wuyunqiang]

import {Dimensions,PixelRatio,Platform} from 'react-native';
export const deviceWidth = Dimensions.get('window').width;      //设备的宽度
export const deviceHeight = Dimensions.get('window').height;    //设备的高度
let fontScale = PixelRatio.getFontScale();                      //返回字体大小缩放比例
let pixelRatio = PixelRatio.get();      //当前设备的像素密度
const defaultPixel = 2;
//iphone6的像素密度
//px转换成dp
const defaultW = Platform.OS ==='ios'?750:720;
const defaultH = Platform.OS ==='ios'?1334:1280;
const w2 = defaultW / defaultPixel;
const h2 = defaultH / defaultPixel;
const scale = Math.min(deviceHeight / h2, deviceWidth / w2);   //获取缩放比例
/**
 * 设置text为sp
 * @param size sp
 * return number dp
 */
export function setSpText(size: number) {
     // size = size/pixelRatio;
    size = Math.round((size * scale + 0.5) * pixelRatio / fontScale);
    return size / pixelRatio;
}

export function scaleSize(size: number) {
    size = Math.round(size * scale + 0.5);
    return size / defaultPixel;
}
global.FONT = setSpText;
global.SCALE = scaleSize;

SCALE(60) FONT (24)...