我想在 flutter 中更改 PopupMenuButton 的形状,想在顶部添加一个三角形,如下图所示,我在 google 上花了很多时间,但没有取得任何成就,请帮助我,我是 flutter 新手,所以我不这样做知道如何更改此默认容器,现在它只有白色圆形容器,白色箭头/三角形未添加在其顶部。请帮忙,提前致谢
popUpMenu= PopupMenuButton<String>(
key: _menuKey,
offset: Offset(50,100),
padding: EdgeInsets.all(0.0),
onSelected: (value) {
if (value == "Tax & Additional Charges") {
endDrawerController.drawerKey.value =
EndDrawerKeys.TaxAndAdditionalChargesEndDrawer;
endDrawerController.scaffoldKey.currentState.openEndDrawer();
print("Entering in tax");
} else if (value == "Hold this Invoice") {
endDrawerController.drawerKey.value =
EndDrawerKeys.HoldInvoiceEndDrawer;
endDrawerController.scaffoldKey.currentState.openEndDrawer();
}
},
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(10.h))),
itemBuilder: (context) => [
PopupMenuItem(
value: "Tax & Additional Charges",
child: popUpMenuSingleItem(
icon: AppAssets.DeliveryIcon,
text: "Tax & Additional Charges",
topMargin: 15.h),
),
PopupMenuItem(
value: "Hold this …Run Code Online (Sandbox Code Playgroud) 我想制作一个以图标为中心的按钮。
这是我的代码。
ElevatedButton.icon(
onPressed: () {},
icon: Icon(Icons.arrow_forward),
label: Text(''),
style: ElevatedButton.styleFrom(
primary: Colors.red,
fixedSize: Size(100, 50),
)
Run Code Online (Sandbox Code Playgroud) 在下面的代码中,我在“controller: urlController”这一行上收到错误
var url;
final urlController = TextEditingController();
@override
void dispose() {
urlController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: const Color(0xff16352A),
title: const Text(
'Downloader',
style: TextStyle(color: Color(0xffEDAB24)),
),
),
body: Container(
padding: const EdgeInsets.all(20.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
const SizedBox(height: 50.0),
const TextField(
controller: urlController,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Paste URL',
),
),
const SizedBox(height: 20.0),
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
TextButton(
onPressed: () {},
child: const Text(
'Download',
style: …Run Code Online (Sandbox Code Playgroud) 我想在 flutter web 视图中添加复习内容
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Stack(
children: <Widget>[
Container(
child: Center(
child: Text(_title),
),
),
],
)),
body: SafeArea(
child: WebView(
key: _key,
javascriptMode: JavascriptMode.unrestricted,
initialUrl: _url)),
);
}
}
Run Code Online (Sandbox Code Playgroud) DropdownButton(
value: dropDownValue1,
onChanged: (String? newValue) {
setState(() {
dropDownValue1 = newValue!;
});
},
items: <String>[
'Work At Office',
'Work From Home',
].map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
)
Run Code Online (Sandbox Code Playgroud)
如何增加箭头和文本之间的间距
我希望我能做到这样,该怎么做呢?
提前致谢
从 AppStore 下载了新的 Xcode 13.2 版本,安装过程卡住了超过 16 个小时。
当卡住的时候如何摆脱这个呢?
我是颤振新手,无法将数据存储在共享首选项中,实际上我正在处理小项目,现在我坚持将数据存储在共享首选项中以供以后使用,所以任何人有任何想法请帮助我......!谢谢。这是我的代码:
import 'package:flutter/material.dart';
import 'home.dart';
class Result extends StatelessWidget {
final String selectedLevel;
final String timeTakenInmin;
Result({Key key, @required this.selectedLevel,@required this.timeTakenInmin}) :
super(key: key);
@override
Widget build(BuildContext context) {
var size = MediaQuery.of(context).size;
return WillPopScope(
onWillPop: () =>Future.value(false),
child: Scaffold(
body: Center(
child: Column(
children: [
Expanded(flex:2,child: LayoutBuilder(
builder: (context,constraints) => Container(
color: Color(0xFF317C84),
child: Center(
child: Text('Your Result',style: TextStyle(
color: Colors.black54,fontWeight: FontWeight.bold,fontSize: 30
),),
),
),
)),
Expanded(flex:1,child: LayoutBuilder(
builder: (context,constraints) => Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/reporticon.png",),scale: …Run Code Online (Sandbox Code Playgroud) flutter ×8
dart ×1
flutter-text ×1
react-native ×1
shapes ×1
textfield ×1
triangle ×1
webview ×1
xcode ×1