【徹底ガイド】ウィジェット作成の15選手法！

import WidgetKit
import SwiftUI

struct SimpleWidgetEntryView: View {
    var body: some View {
        Text("Hello, Widget!")
    }
}

@main
struct SimpleWidget: Widget {
    var body: some WidgetConfiguration {
        StaticConfiguration(kind: "com.example.SimpleWidget", provider: Provider()) { _ in
            SimpleWidgetEntryView()
        }
        .configurationDisplayName("シンプルなウィジェット")
        .description("これは基本的なウィジェットのサンプルです。")
    }
}

import WidgetKit
import SwiftUI

struct DateWidgetEntryView: View {
    let date: Date
    var body: some View {
        Text("\(date, formatter: dateFormatter)")
    }
}

let dateFormatter: DateFormatter = {
    let formatter = DateFormatter()
    formatter.dateStyle = .long
    return formatter
}()

@main
struct DateWidget: Widget {
    var body: some WidgetConfiguration {
        StaticConfiguration(kind: "com.example.DateWidget", provider: Provider()) { entry in
            DateWidgetEntryView(date: entry.date)
        }
        .configurationDisplayName("日付表示ウィジェット")
        .description("現在の日付を表示するウィジェットのサンプルです。")
    }
}

import WidgetKit
import SwiftUI

struct ColoredBackgroundWidget: View {
    var body: some View {
        Text("背景色を変更したウィジェット")
            .background(Color.blue)
            .foregroundColor(Color.white)
    }
}

import WidgetKit
import SwiftUI

struct ImageWidget: View {
    var body: some View {
        Image("sampleImage")
            .resizable()
            .aspectRatio(contentMode: .fit)
    }
}

import WidgetKit
import SwiftUI

struct AnimatedWidget: View {
    @State private var rotationDegree = 0.0

    var body: some View {
        Image("sampleIcon")
            .rotationEffect(.degrees(rotationDegree))
            .onAppear {
                withAnimation(Animation.linear(duration: 5).repeatForever(autoreverses: false)) {
                    rotationDegree = 360
                }
            }
    }
}

import WidgetKit
import SwiftUI
import Combine

struct DataFetchingWidget: View {
    @State private var externalData: String = "データ取得中..."

    var body: some View {
        Text(externalData)
            .onAppear {
                fetchDataFromAPI()
            }
    }

    func fetchDataFromAPI() {
        // ここではダミーのURLを使用
        let url = URL(string: "https://api.example.com/data")!

        URLSession.shared.dataTask(with: url) { data, response, error in
            if let data = data, let fetchedData = String(data: data, encoding: .utf8) {
                DispatchQueue.main.async {
                    self.externalData = fetchedData
                }
            }
        }.resume()
    }
}

import WidgetKit
import SwiftUI

struct UserInputDataWidget: View {
    @AppStorage("userInputData", store: UserDefaults(suiteName: "group.com.example.app"))
    var userInputData: String = "データがありません"

    var body: some View {
        Text(userInputData)
    }
}

import WidgetKit
import SwiftUI
import Combine

struct WeatherWidget: View {
    @State private var weatherInfo: String = "天気情報取得中..."

    var body: some View {
        Text(weatherInfo)
            .onAppear {
                fetchWeatherData()
            }
    }

    func fetchWeatherData() {
        // ここではダミーのURLを使用
        let url = URL(string: "https://api.weather.com/data")!

        URLSession.shared.dataTask(with: url) { data, response, error in
            if let data = data, let fetchedData = String(data: data, encoding: .utf8) {
                DispatchQueue.main.async {
                    self.weatherInfo = fetchedData
                }
            }
        }.resume()
    }
}

import WidgetKit
import SwiftUI

struct CalendarWidget: View {
    @State private var currentDate: Date = Date()

    var body: some View {
        VStack {
            Text("今日の日付:")
            Text("\(currentDate, formatter: DateFormatter.dateOnly)")
        }
    }
}

extension DateFormatter {
    static let dateOnly: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy年MM月dd日"
        return formatter
    }()
}

import WidgetKit
import SwiftUI
import AVFoundation

struct MusicPlayerWidget: View {
    @State private var isPlaying: Bool = false
    private var audioPlayer: AVAudioPlayer?

    init() {
        if let url = Bundle.main.url(forResource: "sample", withExtension: "mp3") {
            try? audioPlayer = AVAudioPlayer(contentsOf: url)
        }
    }

    var body: some View {
        Button(action: togglePlayback) {
            Image(systemName: isPlaying ? "pause.circle" : "play.circle")
                .resizable()
                .aspectRatio(contentMode: .fit)
                .frame(width: 50, height: 50)
        }
    }

    func togglePlayback() {
        if isPlaying {
            audioPlayer?.pause()
        } else {
            audioPlayer?.play()
        }
        isPlaying.toggle()
    }
}

import WidgetKit
import SwiftUI
import CoreMotion

struct StepCounterWidget: View {
    @State private var steps: Int = 0
    private let pedometer = CMPedometer()

    var body: some View {
        VStack {
            Text("今日の歩数")
            Text("\(steps)歩")
        }.onAppear {
            startCountingSteps()
        }
    }

    func startCountingSteps() {
        pedometer.startUpdates(from: Date()) { data, error in
            if let stepCount = data?.numberOfSteps.intValue {
                DispatchQueue.main.async {
                    self.steps = stepCount
                }
            }
        }
    }
}

import WidgetKit
import SwiftUI

struct TimeBasedWidget: View {
    @Environment(\.widgetFamily) var widgetFamily
    let currentTime = Calendar.current.component(.hour, from: Date())

    var body: some View {
        if currentTime < 12 {
            Text("朝の情報: 今日の天気は晴れ")
        } else if currentTime < 18 {
            Text("昼の情報: 最新ニュースをチェック")
        } else {
            Text("夜の情報: 明日の予定を確認")
        }
    }
}

import WidgetKit
import SwiftUI

struct ColorPickerWidget: View {
    @State private var selectedColor: Color = .white

    var body: some View {
        VStack {
            ColorPicker("背景色を選択", selection: $selectedColor)
            Text("お好きな色でカスタマイズ")
        }
        .background(selectedColor)
    }
}

// メモリリークを起こす可能性のあるコード例
class LeakyWidget: NSObject {
    var timer: Timer?

    override init() {
        super.init()
        timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(doSomething), userInfo: nil, repeats: true)
    }

    @objc func doSomething() {
        // 定期的に行いたい処理
    }
}

// メモリリークを避けるためのコード
class SafeWidget: NSObject {
    var timer: Timer?

    override init() {
        super.init()
        timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { [weak self] _ in
            self?.doSomething()
        }
    }

    @objc func doSomething() {
        // 定期的に行いたい処理
    }
}

// OSのバージョンによる条件分岐の例
import SwiftUI

struct VersionSpecificWidget: View {
    var body: some View {
        #if os(iOS 15.0)
            // iOS 15.0向けのコード
            Text("iOS 15.0向けの表示")
        #else
            // それ以前のバージョン向けのコード
            Text("それ以前のバージョン向けの表示")
        #endif
    }
}

import os.log

let customLog = OSLog(subsystem: "com.yourdomain.YourApp", category: "CustomCategory")

func logError(_ error: Error) {
    os_log("エラー発生: %{public}@", log: customLog, type: .error, error.localizedDescription)
}

// エラーを発生させるサンプル関数
func sampleFunction() {
    do {
        // エラーを発生させるコード(例)
        throw NSError(domain: "SampleError", code: 1001, userInfo: nil)
    } catch {
        logError(error)
    }
}

var body: some View {
    VStack {
        Text("Sample Text")
    }.frame(width: 100, height: 50)
}