1 TabBar
一个显示水平选项卡的Material Design widget。
2 构造函数
TabBar({
    Key key,
    @required this.tabs,
    this.controller,
    this.isScrollable = false,
    this.indicatorColor,
    this.indicatorWeight = 2.0,
    this.indicatorPadding = EdgeInsets.zero,
    this.indicator,
    this.indicatorSize,
    this.labelColor,
    this.labelStyle,
    this.labelPadding,
    this.unselectedLabelColor,
    this.unselectedLabelStyle,
    this.dragStartBehavior = DragStartBehavior.start,
    this.onTap,
})3 常用属性3.1 tabs:显示的标签内容
tabs = <Tab>
    Tab(text: "Tab1",),
    Tab(text: "Tab2",),
,3.2 isScrollable:是否可滚动
isScrollable: false,3.3 indicatorColor:指示器颜色
indicatorColor: Color(0xffff0000),3.4 indicatorWeight:指示器高度
indicatorWeight: 1,3.5 indicatorPadding:底部指示器的Padding
indicatorPadding: EdgeInsets.only(bottom: 10.0),3.6 indicatorSize:指示器大小计算方式,TabBarIndicatorSize.label跟文字等宽,TabBarIndicatorSize.tab跟每个tab等宽
indicatorSize: TabBarIndicatorSize.tab,3.7 labelColor:选中label颜色
labelColor: Color(0xff333333),3.8 labelStyle:选中label的Style
labelStyle: TextStyle(
    fontSize: 15.0,
),3.9 labelPadding:每个label的padding值
labelPadding: EdgeInsets.only(left: 20),3.10 unselectedLabelColor:未选中label颜色
unselectedLabelColor: Color(0xffffffff),3.10 unselectedLabelColor:未选中label的Style
unselectedLabelStyle: TextStyle(
    fontSize: 12.0,
),4 EdgeInsets
edgeInsets是Widget的配置类,允许文本方向感知分辨率。
提供的配置方法:
4.1 分别指定四个方向的填充
EdgeInsets.fromLTRB(double left, double top, double right, double bottom)4.2 所有方向均使用相同数值的填充
EdgeInsets.all(doube value)4.3 可以设置具体某个方向的填充(可以同时指定多个方向)
EdgeInsets.only(top:0,right:0,bottom:0,left:0)4.4 用于设置对称方向的填充,vertical指top和bottom,horizontal指left和right
EdgeInsets.symmeric(vertical:0,horizontal:0),正文完