文档优化

@@ -89,17 +89,34 @@ Container(
 
 #### Adapter font:
 ``` 
-      ScreenUtil().setSp(28)         //Incoming font size，the unit is pixel, fonts will not scale to respect Text Size accessibility settings
-      ScreenUtil(allowFontScaling: true).setSp(28)  //Incoming font size，the unit is pixel，fonts will scale to respect Text Size accessibility settings
-
-for example:
-        Text(
-             'My font size is 28px and will not change with the system.',
-                 style: TextStyle(
-                   color: Colors.black,
-                   fontSize:ScreenUtil(allowFontScaling: true).setSp(28, false) 
-                 )
-             ),
+//Incoming font size，the unit is pixel, fonts will not scale to respect Text Size accessibility settings
+//(AllowallowFontScaling when initializing ScreenUtil)
+ScreenUtil().setSp(28)    
+     
+//Incoming font size，the unit is pixel，fonts will scale to respect Text Size accessibility settings
+//(If somewhere does not follow the global allowFontScaling setting)
+ScreenUtil(allowFontScaling: true).setSp(28)  
+
+//for example:
+
+Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: <Widget>[
+                Text(
+                    'My font size is 24px on the design draft and will not change with the system.',
+                    style: TextStyle(
+                      color: Colors.black,
+                      fontSize: ScreenUtil().setSp(24),
+                    )),
+                Text(
+                    'My font size is 24px on the design draft and will change with the system.',
+                    style: TextStyle(
+                      color: Colors.black,
+                      fontSize: ScreenUtil(allowFontScaling: true).setSp(24),
+                    )),
+              ],
+            )
+
 
 ```
 

@@ -94,17 +94,26 @@ Container(
 传入设计稿的px尺寸：
 
 ``` 
-      ScreenUtil().setSp(28)         //传入字体大小，默认不根据系统的“字体大小”辅助选项来进行缩放
-      ScreenUtil(allowFontScaling: true).setSp(28)         //传入字体大小，根据系统的“字体大小”辅助选项来进行缩放
+//传入字体大小，默认不根据系统的“字体大小”辅助选项来进行缩放(可在初始化ScreenUtil时设置allowFontScaling)
+ScreenUtil().setSp(28)         
+ 
+//传入字体大小，根据系统的“字体大小”辅助选项来进行缩放(如果某个地方不遵循全局的allowFontScaling设置)     
+ScreenUtil(allowFontScaling: true).setSp(28)        
      
-for example:
-        Text(
-             'My font size is 28px and will not change with the system.',
-                 style: TextStyle(
-                   color: Colors.black,
-                   fontSize: ScreenUtil(allowFontScaling: true).setSp(28) 
-                 )
-             ),
+//for example:
+
+Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: <Widget>[
+                Text('我的文字大小在设计稿上是25px，不会随着系统的文字缩放比例变化',
+                    style: TextStyle(
+                        color: Colors.black, fontSize: ScreenUtil().setSp(24))),
+                Text('我的文字大小在设计稿上是25px，会随着系统的文字缩放比例变化',
+                    style: TextStyle(
+                        color: Colors.black, fontSize: ScreenUtil(allowFontScaling: true).setSp(24))),
+              ],
+            )
+
 
 ```
 

 name: flutter_screenutil
 description: A flutter plugin for adapting screen and font size.Guaranteed to look good on different models
-version: 0.4.5
+version: 0.4.6
 author: LiZhuoyuan <zhuoyuan93@gmail.com>
 homepage: https://github.com/OpenFlutter/flutter_ScreenUtil