我遇到了颤振问题，并且 isComplet bool 无法正常工作。当我在应用程序中按下它两次时，它会在您点击那里时多次执行任务。我该如何解决？这是整个代码。 todos 列表是任务应用程序中要执行的任务列表，但效果很好：
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:mrplan/loading.dart';
import 'package:mrplan/services/database_services.dart';
import 'package:mrplan/src/models/todo.dart';
import 'package:mrplan/src/pages/graficas_circulares_page.dart';
import 'package:mrplan/src/widgets/appbar.dart';
bool isComplet = false;
TextEditingController todoTitleController = TextEditingController();
class Todolist extends StatefulWidget {
@override
_TodolistState createState() => _TodolistState();
}
class _TodolistState extends State<Todolist> {
TextEditingController todoTitleController = TextEditingController();
@override
Widget build(BuildContext context) {
setState(() {
});
return Scaffold(
body: SafeArea(
child: StreamBuilder<List<Todo>>(
stream: DatabaseService().listTodos(),
builder: (context, snapshot) {
if(!snapshot.hasData){
return Loading();
}
List<Todo> todos = snapshot.data;
if(todos.length == 0){
return Center(child: Text('No hay tareas agregadas!'));
}
return Padding(
padding:EdgeInsets.all(0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(height: 20),
Expanded(
child: ListView.separated(
separatorBuilder: (context, index)=> Divider(color: Colors.white),
shrinkWrap: true,
itemCount: todos.length,
itemBuilder: (context, index){
return Dismissible(
key: UniqueKey(),
background: Container(padding: EdgeInsets.only(left: 20),
alignment: Alignment.centerLeft,
child: Icon(Icons.delete),
color: Colors.red),
onDismissed: (direction) async {
await DatabaseService().removeTodo(todos[index].uid);
quitar();
},
child: StreamBuilder<DocumentSnapshot>(
stream: FirebaseFirestore.instance.collection('Todos').doc().snapshots(),
builder: (context, snapshot) {
var todoss = snapshot.data;
return ListTile(
onTap: (){
isComplet = !isComplet;
if (Todo().isComplet = true)
{DatabaseService().completTask(todos[index].uid);}
if (Todo().isComplet = false)
{DatabaseService().uncompletTask(todos[index].uid);}},
leading: Container(
padding: EdgeInsets.all(2),
height: 30,
width: 30,
decoration: BoxDecoration(
color: Theme.of(context).primaryColor,
shape: BoxShape.circle
),
child: todos[index].isComplet
? Icon(
Icons.check,
color: Colors.white,)
: Container(),
),
title: Text(
todos[index].title,
style: todos[index].isComplet
? TextStyle(
fontSize: 20,
fontWeight: FontWeight.w600,
decoration: TextDecoration.lineThrough,
decorationColor: Colors.red,
)
: TextStyle(
fontSize: 20,
fontWeight: FontWeight.w600,
decoration: null
)
),
);
}
),
);
}
),
)
],
),
);
}
)
),
);
}
}
class Appbar extends StatefulWidget {
@override
_AppbarState createState() => _AppbarState();
}
class _AppbarState extends State<Appbar> {
@override
Widget build(BuildContext context) {
bool isbuttondisabled = false;
setState(() {
});
return StreamBuilder<Object>(
stream: null,
builder: (context, snapshot) {
return Container(
alignment: Alignment.bottomCenter,
child: BottomAppBar(
elevation: 0,
child: Container(
height: MediaQuery.of(context).size.height * 0.05,
width: MediaQuery.of(context).size.width,
child: Row(
children: [
Container(
decoration: BoxDecoration(
color:Colors.grey[100],
borderRadius: BorderRadius.only(
topLeft: const Radius.circular(5.0),
)
),
height: MediaQuery.of(context).size.height,
padding: EdgeInsets.symmetric(horizontal: 10.0),
width: MediaQuery.of(context).size.width * 0.835,
child: Center(
child: TextFormField(
controller: todoTitleController,
autofocus: true,
decoration: InputDecoration(
hintStyle: TextStyle(color: Colors.blue[800]),
hintText: "Inserte una tarea...",
border: InputBorder.none
),
),
),
),
TextButton(
child: Container(
height: MediaQuery.of(context).size.height,
child: Center(child: Icon(Icons.add))),
style: TextButton.styleFrom(
primary: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.only(
topRight: const Radius.circular(10.0),
)
),
backgroundColor: Theme.of(context).primaryColor
),
onPressed: isbuttondisabled ? null : ()async {
if(todoTitleController.text.isNotEmpty){
await DatabaseService().createNewTodo(todoTitleController.text.trim());
FocusScope.of(context).unfocus();
anadir();
todoTitleController.clear();
isComplet = !isComplet;
}
}
)
],
),
)
)
);
}
);
}
}
我被困的相关代码是这样的：
onTap: (){
isComplet = !isComplet;
if (Todo().isComplet = true)
{DatabaseService().completTask(todos[index].uid);}
if (Todo().isComplet = false)
{DatabaseService().uncompletTask(todos[index].uid);}},
非常感谢！
答案 0 :(得分：0)
如果能稍微重构一下代码就更好了。但是问题来了
删除构建方法中的这段代码
bool isbuttondisabled = false;
setState(() {
});
添加bool isbuttondisabled = false;
在构建方法之外。
你的按钮在哪里，
在 onPressed 参数中
setState(() {
isbuttondisabled=true;
//Todo add your code
});```