Flutter基础widgets教程-PopupMenuButton篇

PopupMenuButton({
    Key key,
    @required this.itemBuilder,
    this.initialValue,
    this.onSelected,
    this.onCanceled,
    this.tooltip,
    this.elevation = 8.0,
    this.padding = const EdgeInsets.all(8.0),
    this.child,
    this.icon,
    this.offset = Offset.zero,
})

itemBuilder:<PopupMenuItem<String>>[],

initialValue: 'value',

onSelected:(String action) {}

onCanceled: () {}

tooltip: "长按提示",

elevation:8.0,

child: Text("abc"),

icon: Image(image: AssetImage("lib/assets/tabbar/search.png"),),