Swiftでのダイアログ表示の完璧な方法10選

import UIKit

let alertController = UIAlertController(title: "タイトル", message: "これはダイアログのメッセージです", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "閉じる", style: .default, handler: nil))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "選択", message: "どちらのボタンを選びますか？", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "ボタン1", style: .default, handler: { _ in
    print("ボタン1がタップされました")
}))
alertController.addAction(UIAlertAction(title: "ボタン2", style: .cancel, handler: { _ in
    print("ボタン2がタップされました")
}))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "", message: "", preferredStyle: .alert)
let title = NSAttributedString(string: "カスタムタイトル", attributes: [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 18)])
let message = NSAttributedString(string: "カスタムメッセージ", attributes: [NSAttributedString.Key.foregroundColor : UIColor.red])
alertController.setValue(title, forKey: "attributedTitle")
alertController.setValue(message, forKey: "attributedMessage")
alertController.addAction(UIAlertAction(title: "閉じる", style: .default, handler: nil))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "選択", message: "好きなボタンを選択してください", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "選択1", style: .default, handler: { _ in
    print("選択1がタップされました")
}))
alertController.addAction(UIAlertAction(title: "選択2", style: .default, handler: { _ in
    print("選択2がタップされました")
}))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "注意", message: "背景色が変わったダイアログです", preferredStyle: .alert)
let subview = alertController.view.subviews.first!
let alertContentView = subview.subviews.first!
alertContentView.backgroundColor = UIColor.blue.withAlphaComponent(0.6)
alertController.addAction(UIAlertAction(title: "確認", style: .default, handler: nil))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "入力", message: "テキストを入力してください", preferredStyle: .alert)
alertController.addTextField { textField in
    textField.placeholder = "こちらに入力"
}
alertController.addAction(UIAlertAction(title: "確認", style: .default, handler: { _ in
    if let inputText = alertController.textFields?.first?.text {
        print("入力されたテキスト: \(inputText)")
    }
}))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "画像付きダイアログ", message: "\n\n\n\n\n\n", preferredStyle: .alert)
let imageView = UIImageView(frame: CGRect(x: 10, y: 50, width: 250, height: 100))
imageView.image = UIImage(named: "sampleImage")
alertController.view.addSubview(imageView)
alertController.addAction(UIAlertAction(title: "閉じる", style: .default, handler: nil))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "スライダー付きダイアログ", message: "\n\n\n", preferredStyle: .alert)
let slider = UISlider(frame: CGRect(x: 10, y: 60, width: 250, height: 20))
alertController.view.addSubview(slider)
alertController.addAction(UIAlertAction(title: "確認", style: .default, handler: { _ in
    print("選択された値: \(slider.value)")
}))
present(alertController, animated: true, completion: nil)

import UIKit

let alertController = UIAlertController(title: "セグメントコントロール付きダイアログ", message: "\n\n\n", preferredStyle: .alert)
let items = ["選択1", "選択2", "選択3"]
let segmentControl = UISegmentedControl(items: items)
segmentControl.frame = CGRect(x: 10, y: 60, width: 250, height: 30)
alertController.view.addSubview(segmentControl)
alertController.addAction(UIAlertAction(title: "確認", style: .default, handler: { _ in
    let selectedIndex = segmentControl.selectedSegmentIndex
    print("選択された項目: \(items[selectedIndex])")
}))
present(alertController, animated: true, completion: nil)

import UIKit

class DialogViewController: UITableViewController {
    let items = ["項目1", "項目2", "項目3"]

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return items.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        cell.textLabel?.text = items[indexPath.row]
        return cell
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("選択された項目: \(items[indexPath.row])")
        self.dismiss(animated: true, completion: nil)
    }
}

let dialogVC = DialogViewController()
dialogVC.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
let navVC = UINavigationController(rootViewController: dialogVC)
navVC.modalPresentationStyle = .formSheet
present(navVC, animated: true, completion: nil)

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        do {
            try showDialog()
        } catch {
            print("ダイアログ表示に失敗しました: \(error)")
        }
    }

    func showDialog() throws {
        // ここにダイアログ表示のコードを書く
        // エラーが発生した場合はcatchブロックでキャッチする
    }
}