Flutter 限制按钮点击的时间间隔

有时候需要防止用户误点击按钮,特别是用flutter web做前端, 和后端交互的时候.

通过对点击按钮事件的时间间隔做控制,来实现对按钮点击的控制.

方法定义

  var  lastPopTime = DateTime.now();

  void intervalClick(int needTime){
          // 防重复提交
          if(lastPopTime == null || DateTime.now().difference(lastPopTime) > Duration(seconds: needTime)){
            print(lastPopTime);
            lastPopTime = DateTime.now();
            print("允许点击");
          }else{
            // lastPopTime = DateTime.now(); //如果不注释这行,则强制用户一定要间隔2s后才能成功点击. 而不是以上一次点击成功的时间开始计算.
            print("请勿重复点击！");
          }
        }

调用

 floatingActionButton: FloatingActionButton(
        onPressed:(){
          intervalClick(2);
        },
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), 

完整demo代码

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State {
  
  int _counter = 0;

  var  lastPopTime = DateTime.now();

  void intervalClick(int needTime){
          // 防重复提交
          if(lastPopTime == null || DateTime.now().difference(lastPopTime) > Duration(seconds: needTime)){
            print(lastPopTime);
            lastPopTime = DateTime.now();
            print("允许点击");
          }else{
            // lastPopTime = DateTime.now(); //如果不注释这行,则强制用户一定要间隔2s后才能成功点击. 而不是以上一次点击成功的时间开始计算.
            print("请勿重复点击！");
          }
        }

  @override
  Widget build(BuildContext context) {
    
    return Scaffold(
      appBar: AppBar(
        
        title: Text(widget.title),
      ),
      body: Center(
        
        child: Column(
         
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed:(){
          intervalClick(2);
        },
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), 
    );
  }
}

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