iOS、Android、WP 开发费用是多少 [关闭]

iOS、Android和WP是目前市场上最常见的移动操作系统，每个操作系统都有自己的开发费用。本文将分别介绍这三个操作系统的开发费用，并附上相应的案例代码。

import UIKit
class ViewController: UIViewController {
    @IBOutlet weak var displayLabel: UILabel!
    var firstNumber = 0
    var secondNumber = 0
    var operation = ""
    @IBAction func numberButtonTapped(_ sender: UIButton) {
        let number = sender.tag
        displayLabel.text = displayLabel.text! + "\(number)"
    }
    @IBAction func operationButtonTapped(_ sender: UIButton) {
        operation = sender.titleLabel!.text!
        firstNumber = Int(displayLabel.text!)!
        displayLabel.text = ""
    }
    @IBAction func equalButtonTapped(_ sender: UIButton) {
        secondNumber = Int(displayLabel.text!)!
        var result = 0
        switch operation {
        case "+":
            result = firstNumber + secondNumber
        case "-":
            result = firstNumber - secondNumber
        case "*":
            result = firstNumber * secondNumber
        case "/":
            result = firstNumber / secondNumber
        default:
            break
        }
        displayLabel.text = "\(result)"
    }
    @IBAction func clearButtonTapped(_ sender: UIButton) {
        displayLabel.text = ""
        firstNumber = 0
        secondNumber = 0
        operation = ""
    }
}

java
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
    private TimePicker timePicker;
    private Button setButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        timePicker = findViewById(R.id.timePicker);
        setButton = findViewById(R.id.setButton);
        setButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int hour = timePicker.getCurrentHour();
                int minute = timePicker.getCurrentMinute();
                Calendar calendar = Calendar.getInstance();
                calendar.set(Calendar.HOUR_OF_DAY, hour);
                calendar.set(Calendar.MINUTE, minute);
                calendar.set(Calendar.SECOND, 0);
                setAlarm(calendar.getTimeInMillis());
            }
        });
    }
    private void setAlarm(long timeInMillis) {
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this, AlarmReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
        alarmManager.setExact(AlarmManager.RTC_WAKEUP, timeInMillis, pendingIntent);
        Toast.makeText(this, "闹钟已设置", Toast.LENGTH_SHORT).show();
    }
}

csharp
using System;
using Windows.Devices.Geolocation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
namespace WeatherApp
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }
        protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            Geolocator geolocator = new Geolocator();
            Geoposition geoposition = await geolocator.GetGeopositionAsync();
            double latitude = geoposition.Coordinate.Latitude;
            double longitude = geoposition.Coordinate.Longitude;
            WeatherData weatherData = await WeatherAPI.GetWeatherData(latitude, longitude);
            if (weatherData != null)
            {
                cityName.Text = weatherData.CityName;
                temperature.Text = weatherData.Temperature.ToString("N1") + "°C";
                weatherDescription.Text = weatherData.Description;
            }
        }
    }
}