li_zy
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Update README.md

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使用方法:
导入包
安装依赖
```
import 'package:flutter_app/ScreenUtil.dart'; //导入
dependencies:
flutter:
sdk: flutter
# 添加依赖
flutter_screenutil:
git:
url: git://github.com/lizhuoyuan/flutter_ScreenUtil
```
在每个使用的地方导入包:
```
import 'package:flutter_screenutil/flutter_screenutil.dart';
```
在使用之前请设置好设计稿的宽度和高度,如果不设置则使用默认尺寸
传入设计稿的宽度和高度(单位px),默认为1080*1920
推荐在main.dart中设置,以保证在使用之前设置好了适配尺寸:
推荐在项目入口中设置,以保证在每次使用之前设置好了适配尺寸:
```
ScreenUtil.instance = new ScreenUtil(width: 360, height: 720);
```
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