added for split screen by setting min height

+import 'dart:ui';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_screenutil/flutter_screenutil.dart';
 
@@ -50,7 +52,7 @@ class _HomePageState extends State<HomePage> {
                 Container(
                   padding: EdgeInsets.all(ScreenUtil().setWidth(10)),
                   width: 180.w,
-                  height: 200.h,
+                  height: 120.h,
                   color: Colors.red,
                   child: Text(
                     '我的实际宽度:${180.w}dp \n'

@@ -7,6 +7,7 @@ library flutter_screenutil;
 
 import 'dart:math';
 import 'dart:ui' as ui;
+import 'dart:ui';
 
 import 'package:flutter/material.dart';
 

@@ -5,28 +5,34 @@ class ScreenUtilInit extends StatelessWidget {
   ScreenUtilInit({
     required this.builder,
     this.designSize = ScreenUtil.defaultSize,
+    this.splitScreenMode = true,
     Key? key,
   }) : super(key: key);
 
   final Widget Function() builder;
+  final bool splitScreenMode;
 
   /// The [Size] of the device in the design draft, in dp
   final Size designSize;
-  BoxConstraints constraints1 = BoxConstraints(maxHeight: 0.0);
 
   @override
   Widget build(BuildContext context) {
     return LayoutBuilder(builder: (_, BoxConstraints constraints) {
-      if (constraints.maxHeight > constraints1.maxHeight) {
-        constraints1 = constraints;
+      if (splitScreenMode) {
+        constraints = BoxConstraints(
+            minHeight: constraints.minHeight,
+            maxHeight: max(constraints.maxHeight, 700),
+            minWidth: constraints.minWidth,
+            maxWidth: constraints.maxWidth);
       }
-      if (constraints1.maxWidth != 0) {
+
+      if (constraints.maxWidth != 0) {
         final Orientation orientation =
-            constraints1.maxWidth > constraints1.maxHeight
+            constraints.maxWidth > constraints.maxHeight
                 ? Orientation.landscape
                 : Orientation.portrait;
         ScreenUtil.init(
-          constraints1,
+          constraints,
           orientation: orientation,
           designSize: designSize,
         );