我只能使Flutter中的iPad仅使GridView的一个元素消失吗？
问题描述 投票：0回答：1
仅当设备是iPad时，我才想在gridView中隐藏元素。我曾尝试检索DeviceInfo，但由于我的GridView返回了一个以gridView元素作为其子元素的GestureDetetctor，因此我不知道如何隐藏它。我虽然将不透明度设为零，但是我不知道如何实现，因为返回的所有内容都包装在一个gestureDetector中。
Expanded(
flex: 18,
child: GridView.builder(
itemCount: homeList.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2, mainAxisSpacing: 20),
itemBuilder: (ctx, i) {
return GestureDetector(
onTap: () {
if (i == 0) {
_interstitialAd.show();
} else if (i == 1) {
} else if (i == 2) {
sendInvite();
} else if (i == 3) {
hideBannerAd();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Null()));
} else if (i == 4) {
hideBannerAd();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Main()));
} else if (i == 5) {
hideBannerAd();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Body()));
}
},
child: Container(
decoration: BoxDecoration(
borderRadius: const BorderRadius.all(
Radius.circular(16.0)),
),
width: 150,
margin:
const EdgeInsets.symmetric(horizontal: 11.0),
child: Container(
child: ClipRRect(
borderRadius: BorderRadius.circular(19.0),
child: Stack(
children: <Widget>[
Positioned.fill(
child: Image.asset(
homeList[i].imagePath,
fit: BoxFit.cover,
),
),
Positioned(
bottom: 0,
left: 0,
right: 0,
child: Container(
padding: EdgeInsets.symmetric(
horizontal: 9.0, vertical: 5.0),
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [
const Color(0xFFFF8C3B),
const Color(0xFFFE524B)
],
begin: Alignment.centerLeft,
end: Alignment.centerRight,
),
borderRadius: BorderRadius.only(
topRight:
Radius.circular(15))),
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
Text(
"${homeList[i].taskTitle}",
style: TextStyle(
fontFamily: "Netflix",
fontWeight: FontWeight.w600,
fontSize: 17,
letterSpacing: 0.27,
color: Colors.white,
),
),
这是我的gridView的样子：
更新：我尝试了这个，但是似乎没有用
iPad async(){
// checks for device iPad
}
return Visibility(
visible: iPad,
child: GestureDetector(
onTap: () async {
if (i == 0) {
if (await interstitialAd.isLoaded) {
interstitialAd.show();
} else {
Reward(context);
}
} else if (i == 1) {
} else if (i == 2) {
sendInvite();
} else if (i == 3) {
hideBannerAd();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Scratch()));
}= else if (i == 5 && _isVisible()) {
hideBannerAd();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Body()));
}
1个回答
0
投票
投票
您可以在下面复制粘贴运行完整的示例代码步骤1：使用2个预定义列表allList和noIpadList，在检查设备类型之后，使homeList指向allList或noIpadList
static List<Home> noIpadList = [
Home(taskTitle: "a", imagePath: "a", routeName: "/a"),
Home(taskTitle: "b", imagePath: "b", routeName: "/b")
];
static List<Home> allList = List.from(noIpadList)
..add(Home(taskTitle: "ipad", imagePath: "ipad", routeName: "/ipad"));
List<Home> homeList;
super.initState();
if (isIpad) {
homeList = noIpadList;
} else {
homeList = allList;
}
}
步骤2：使用route简化push动作，并且当ontap选中homeList[i].taskTitle而不是index时，因为ipad项目可能不存在
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
initialRoute: '/',
routes: {
'/': (context) => MyHomePage(title: 'Flutter Demo Home Page'),
'/a': (context) => Main(),
'/b': (context) => Body(),
'/ipad': (context) => Body(),
},
return GestureDetector(
onTap: () {
if (widget.homeList[i].taskTitle == "a") {
Navigator.pushNamed(context, widget.homeList[i].routeName);
}
if (widget.homeList[i].taskTitle == "b") {
Navigator.pushNamed(context, widget.homeList[i].routeName);
}
if (widget.homeList[i].taskTitle == "ipad") {
Navigator.pushNamed(context, widget.homeList[i].routeName);
}
工作演示更改checkIsIpad()返回true或false您可以看到ipad项目显示或消失
完整示例代码
import 'package:flutter/material.dart';
import 'package:device_info/device_info.dart';
Future<bool> checkIsIpad() async {
/*DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
IosDeviceInfo info = await deviceInfo.iosInfo;
if (info.name.toLowerCase().contains("ipad")) {
return true;
}
return false;*/
return true;
}
bool isIpad = false;
void main() async {
WidgetsFlutterBinding.ensureInitialized();
isIpad = await checkIsIpad();
runApp(MyApp());
}
class Home {
String taskTitle;
String imagePath;
String routeName;
Home({this.taskTitle, this.imagePath, this.routeName});
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
initialRoute: '/',
routes: {
// When navigating to the "/" route, build the FirstScreen widget.
'/': (context) => MyHomePage(title: 'Flutter Demo Home Page'),
// When navigating to the "/second" route, build the SecondScreen widget.
'/a': (context) => Main(),
'/b': (context) => Body(),
'/ipad': (context) => Body(),
},
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
static List<Home> noIpadList = [
Home(taskTitle: "a", imagePath: "a", routeName: "/a"),
Home(taskTitle: "b", imagePath: "b", routeName: "/b")
];
static List<Home> allList = List.from(noIpadList)
..add(Home(taskTitle: "ipad", imagePath: "ipad", routeName: "/ipad"));
List<Home> homeList;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
void initState() {
// TODO: implement initState
super.initState();
if (isIpad) {
homeList = noIpadList;
} else {
homeList = allList;
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(flex: 1, child: Test(homeList: homeList)),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class Test extends StatefulWidget {
final List<Home> homeList;
Test({this.homeList});
@override
_TestState createState() => _TestState();
}
class _TestState extends State<Test> {
@override
Widget build(BuildContext context) {
return GridView.builder(
itemCount: widget.homeList.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2, mainAxisSpacing: 20),
itemBuilder: (ctx, i) {
return GestureDetector(
onTap: () {
if (widget.homeList[i].taskTitle == "a") {
Navigator.pushNamed(context, widget.homeList[i].routeName);
}
if (widget.homeList[i].taskTitle == "b") {
Navigator.pushNamed(context, widget.homeList[i].routeName);
}
if (widget.homeList[i].taskTitle == "ipad") {
Navigator.pushNamed(context, widget.homeList[i].routeName);
}
},
child: Container(
decoration: BoxDecoration(
borderRadius: const BorderRadius.all(Radius.circular(16.0)),
),
width: 150,
margin: const EdgeInsets.symmetric(horizontal: 11.0),
child: Container(
child: ClipRRect(
borderRadius: BorderRadius.circular(19.0),
child: Stack(children: <Widget>[
Positioned.fill(
child: Image.asset(
widget.homeList[i].imagePath,
fit: BoxFit.cover,
),
),
Positioned(
bottom: 0,
left: 0,
right: 0,
child: Container(
padding: EdgeInsets.symmetric(
horizontal: 9.0, vertical: 5.0),
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [
const Color(0xFFFF8C3B),
const Color(0xFFFE524B)
],
begin: Alignment.centerLeft,
end: Alignment.centerRight,
),
borderRadius: BorderRadius.only(
topRight: Radius.circular(15))),
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
Text(
"${widget.homeList[i].taskTitle}",
style: TextStyle(
fontFamily: "Netflix",
fontWeight: FontWeight.w600,
fontSize: 17,
letterSpacing: 0.27,
color: Colors.white,
),
),
])))
])))));
});
}
}
class Main extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Text("Main");
}
}
class Body extends StatefulWidget {
@override
_BodyState createState() => _BodyState();
}
class _BodyState extends State<Body> {
@override
Widget build(BuildContext context) {
return Text("Body");
}
}
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