我将数据从我的aleraldialog传递给listView项目。
我可以在哪里找到有关它的信息？
我尝试使用带有导航路由的TextedingController。我使用了本教程中的材料
这是我的代码：
class MeasurementsScreen extends StatefulWidget {
@override
_MeasurementsScreenState createState() => _MeasurementsScreenState();
}
class _MeasurementsScreenState extends State<MeasurementsScreen> {
List<_ListItem> listItems;
String lastSelectedValue;
var name = ["Рост", "Вес"];
var indication = ["Введите ваш рост", "Введите ваш вес"];
TextEditingController customcintroller;
void navigationPageProgrammTrainingHandler() {
Navigator.of(context).push(MaterialPageRoute(
builder: (BuildContext context) => ProgrammTrainingHandler()),
);
}
@override
void initState() {
super.initState();
initListItems();
}
Future<String> createAlertDialog(BuildContext context, int indexAl){
customcintroller = TextEditingController();
if(indexAl < 2){
return showDialog(context: context, builder: (context){
return AlertDialog(
title: Text(name[indexAl]),
content: TextField(
textDirection: TextDirection.ltr,
controller: customcintroller,
style: TextStyle(
color: Colors.lightGreen[400],
fontSize: 18.5),
decoration: InputDecoration(
contentPadding: EdgeInsets.only(bottom: 4.0),
labelText: indication[indexAl],
alignLabelWithHint: false,
),
keyboardType: TextInputType.phone,
textInputAction: TextInputAction.done,
),
actions: <Widget>[
FlatButton(
child: const Text('ОТМЕНА'),
onPressed: () {
Navigator.of(context).pop();
},
),
FlatButton(
child: const Text('ОК'),
onPressed: () {
Navigator.of(context).pop(customcintroller.text.toString());
},
),
],
);
});
} else if (indexAl > 1){
navigationPageProgrammTrainingHandler();
}
}
@override
Widget build(BuildContext context) {
return new Scaffold(
backgroundColor: Color(0xff2b2b2b),
appBar: AppBar(
title: Text(
'Замеры',
style: new TextStyle(
color: Colors.white,
),),
leading: IconButton(
icon:Icon(Icons.arrow_back),
color: Colors.white ,
onPressed:() => Navigator.of(context).pop(),
),
),
body: ListView.builder(
physics: BouncingScrollPhysics(),
itemCount: listItems.length,
itemBuilder: (BuildContext ctxt, int index){
return GestureDetector(
child: listItems[index],
onTap: () {
createAlertDialog(context, index).then((onValue){
});
}
);
},
),
);
}
void initListItems() {
listItems = [
new _ListItem(
bgName: 'assets/images/soso_growth.jpg',
name: customcintroller.text.toString().isEmpty == false ? customcintroller.text.toString() : "Рост",
detail: "Нажми, чтобы добавить свой рост"),
new _ListItem(
bgName: 'assets/images/soso_weight.jpg',
name: customcintroller.text.toString().isEmpty == false ? customcintroller.text.toString() : "Вес",
detail: "Нажми, чтобы добавить свой вес"),
new _ListItem(
bgName: 'assets/images/soso_chest.jpg',
name: "Грудь",
detail: "PRO-версия"),
new _ListItem(
bgName: 'assets/images/soso_shoulder.jpg',
name: "Плечи",
detail: "PRO-версия"),
new _ListItem(
bgName: 'assets/images/soso_biceps.jpg',
name: "Бицепс",
detail: "PRO-версия")
];
}
}
class _ListItem extends StatelessWidget {
_ListItem({this.bgName, this.name, this.detail});
// final int index;
final String bgName;
final String name;
final String detail;
@override
Widget build(BuildContext context) {
return Container(
height: 180.0,
margin: const EdgeInsets.symmetric(
vertical: 1.0,
),
child: new Stack(
children: <Widget>[
new Container(
decoration: new BoxDecoration(
image: new DecorationImage(
image: new AssetImage(bgName),
colorFilter: new ColorFilter.mode(
Colors.black.withOpacity(0.45), BlendMode.darken),
fit: BoxFit.cover,
alignment: Alignment.center),
),
child: new SizedBox.expand(
child: Container(
alignment: Alignment.center,
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new Text(
name,
style: new TextStyle(fontSize: 29.0, color: Colors.white),
),
Padding(
padding: const EdgeInsets.only(top: 12.0),
child: new Text(
detail,
style:
new TextStyle(fontSize: 16.0, color: Colors.white),
),
)
],
),
),
),
),
],
),
);
}
}
我希望从AlertDialog获得文本。
您是否要在当前屏幕或其他脚手架/屏幕中更新数据？第一个选项的解决方案是将所需的数据设置为设定状态，或将其传递到模型(带有ScopedModel(并更新视图。例如。：
FlatButton(
child: const Text('ОТМЕНА'),
onPressed: () {
setState(() {
myData = data;
Navigator.of(context).pop();
}); // not sure if this will work, could you try?
}
),
如果它在新的/其他屏幕中，则可以在导航器中传递，例如：
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => NewScreen(data: myData),
),
);
},
这可以解决您的问题吗？否则，请详细说明您需要的内容。
我尝试在AlertDialog中使用Navigator.of(context).pop("OK");，但它不起作用。将ValueChanged用作Showdialog方法的参数，并且效果很好。
class Dialogs{
static showAlertDialog(BuildContext context, String title, String message,
{List<String> actions, ValueChanged onChanged}) async {
if (actions == null) {
actions = ["OK"];//default OK button.
}
await showDialog(
context: context,
child: AlertDialog(
title: Text(title ?? 'Message'),
content: Text(message),
actions: actions
.map((e) => new FlatButton(
child: Text(e.trim()),
onPressed: () {
Navigator.of(context).pop(e.trim());
if (onChanged != null) {
onChanged(e.trim());
}
}))
.toList(),
),
);
}
}
呼叫者看起来像
_onProcess(){
String result = "";
await Dialogs.showAlertDialog(context, "Warning", "Warning message", actions: ["OK", "Cancel"],
onChanged: (value) {
result = value;
});
if (result != "OK") {
Dialogs.showSnackBarMessage(context, "Cancel This PTN");
return;
}
....process with the OK logic.
}
如果要更改列表的项目，则可以在调用Navigator.pop((之前使用setState((执行此操作。但是，由于您可以使用navigator.push(... mypage(data((。
您可以通过国家管理实现所需的目标。您可以一般检查国家管理教程。但是我认为最使用的两种实践是范围的模型和集体模式。这些实践可帮助您向后和向前传递小部件树。我建议集体模式有很多教程。还有一个包裹对集体图案非常有帮助：Flutter_Bloc。