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import SwiftUI

public struct AlertModifier: ViewModifier {
    @Binding var showAlert: Bool
    var error: Error?

    public func body(content: Content) -> some View {
        content
            .alert("", isPresented: $showAlert) {
                Button("Close", role: .cancel) {}

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import SwiftUI

struct FailureView: View {
    @State var isShowSheet = false
    @State var shareData: String?
    
    var body: some View {
        Button("Change(Fail)") {
            shareData = "Show this message"
            isShowSheet = true

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import UIKit

enum Temp {
    case one
}

enum Number: Int {
    case one
}

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// Thread 1: Simultaneous accesses to 0x7fcf738afc10, but modification requires exclusive access　

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let button = UIButton(type: .custom)
button.setContentCompressionResistancePriority(.required, for: .horizontal)

// （参考）
// https://medium.com/eureka-engineering/ios%E3%82%A8%E3%83%B3%E3%82%B8%E3%83%8B%E3%82%A2%E5%BF%85%E8%A6%8B-ios%E3%81%AE%E3%83%AC%E3%82%A4%E3%82%A2%E3%82%A6%E3%83%88%E3%81%A7%E6%8A%BC%E3%81%95%E3%81%88%E3%81%A6%E3%81%8A%E3%81%8D%E3%81%9F%E3%81%84%E3%81%93%E3%81%A8-%E7%B7%8F%E9%9B%86%E7%B7%A8-b25342566ccc
// https://qiita.com/shiz/items/523e3741899e9607c26f

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UNUserNotificationCenter.current().getNotificationSettings { (settings) in
    switch settings.authorizationStatus {
    case .notDetermined:
        // まだ通知許可を求めていない。初期状態
    case .denied:
        // 通知を拒否
    case .authorized:
        // 通知を許可
    case .provisional:
        // iOS 12から導入されたProvisional Authorization

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final class SomeStore {
    static let key = "xxx"
    private let userDefaults: UserDefaults

    init(userDefaults: UserDefaults = .standard) {
        self.userDefaults = userDefaults
    }

    func set(some: String) {
        userDefaults.set(some, forKey: Self.key)

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import UIKit

// official document
// https://developer.apple.com/documentation/swift/array/3126951-insert

// safe!
var array = [0, 1, 2, 3, 4, 5, 6]
array.insert(7, at: 7)
print(array)

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let size = systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)

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// 基本的にはinfo.plistで設定できる
// 
// iPadだけで別に設定することも可
// https://developer.apple.com/documentation/uikit/uiviewcontroller/1621435-supportedinterfaceorientations
// Supported interface orientations
// Supported interface orientations (iPad)