1. return new WillPopScope(
    2. child: Scaffold(
    3. body: new Center(
    4. child: new Column(
    5. children: <Widget>[
    6.       ......  
    7. ],
    8. )),
    9. floatingActionButton: FloatingActionButton(
    10. onPressed: () => Navigator.pop(context),
    11. // tooltip: 'Update Text',
    12. child: Icon(Icons.reply),
    13. ),
    14. ),
    15. onWillPop: (){print("返回键点击了");Navigator.pop(context);});
    16. }

    返回页面传参数
    onPressed: (){
    Navigator.pop(context,car);
    }