flutter Widget basics

 

 

 

 

 

AppBar-Navigation bar

AppBar ( 
  title: Text ( ' FirstPage ' ), 
  elevation: 0.0 , // The border below the header is displayed, the larger the value, the more obvious the display 
),

Parameter Description:

• title: title, String
• elevation: bottom line, number type, the larger the value, the more obvious the display