بعض الحيل والافكار فى flutter

dismissKeyboard(BuildContext context) {
   FocusScope.of(context).requestFocus(new FocusNode());
 }

 Widget body1() {
   return GestureDetector(
     behavior: HitTestBehavior.opaque,
     onTap: () {
       _dismissKeyboard(context);
     },
     child: Container(
       color: Colors.white,
       child: Column(
         children: <Widget>[
           TextField(),
         ],
       ),
     ),
   );
 }

Widget body4() {
    return Container(
      height: 40.0,
      padding: EdgeInsets.all(20.0),
      margin: EdgeInsets.all(30.0),
      decoration: BoxDecoration(
        color: Colors.green,
        borderRadius: BorderRadius.all(
          Radius.circular(5.0),
        ),
      ),
    );
  }

Widget body8() {
   return ListView.separated(
     separatorBuilder: (context, index) => Divider(
           color: Colors.black,
         ),
     itemCount: 20,
     itemBuilder: (context, index) => Padding(
           padding: EdgeInsets.all(8.0),
           child: Center(child: Text("Index $index")),
         ),
   );
 }

void periodic() {
  Timer.periodic(
    Duration(seconds: 1),
    (Timer time) {
    print("time: ${time.tick}");
    if (time.tick == 5) {
        time.cancel();
        print('Timer Cancelled');
    }
   },
  );
}

void getDevice() {
    bool ios = Platform.isAndroid;
    print('iOS1: $ios');
    bool isIOS = Theme.of(context).platform == TargetPlatform.iOS;
    print('iOS2: $isIOS');
}