Flutter Development Tutorials, Guides & Insights

لإضافة زر يقوم بتغيير النص عند الضغط عليه:

import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String message = 'اضغط على الزر لتغيير النص';

  void changeMessage() {
    setState(() {
      message = 'تم تغيير النص!';
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('تطبيق Flutter تفاعلي'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                message,
                style: TextStyle(fontSize: 20),
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: changeMessage,
                child: Text('اضغط هنا'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

Create a new file lib/models/weather.dart and define the data model:

class Weather {
  final String cityName;
  final double temperature;
  final String description;
  final String icon;

  Weather({
    required this.cityName,
    required this.temperature,
    required this.description,
    required this.icon,
  });

  factory Weather.fromJson(Map<String, dynamic> json) {
    return Weather(
      cityName: json['name'],
      temperature: json['main']['temp'].toDouble(),
      description: json['weather'][0]['description'],
      icon: json['weather'][0]['icon'],
    );
  }
}

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

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

Run the following command in the terminal to start the app: