第二篇：Swift Clock App 實作（下）－資料存取與推播通知

1. 新增與編輯鬧鐘

當使用者點擊「儲存」按鈕時，應用會判斷是編輯已有鬧鐘還是新增新鬧鐘。若是編輯模式，會更新鬧鐘資料；否則，則會新增新的鬧鐘並存入 Realm 資料庫。

@objc func doneTapped() {
    if let alarmToEdit = alarmToEdit {
        updateAlarm(alarmToEdit)
    } else {
        saveNewAlarm()
    }
}

saveNewAlarm() 方法負責將使用者輸入的鬧鐘時間、名稱、重複日期及鈴聲存入 Realm，並設定推播通知提醒：

func saveNewAlarm() {
    let realm = try! Realm()
    let newAlarm = AlarmData(
        alarmTime: formatDate(datePicker.date),
        creatTime: getSystemTime(),
        name: txfRename.text?.isEmpty == true ? "鬧鐘" : txfRename.text ?? "",
        repeatDays: repeatDays,
        sound: selectedSound
    )
    
    try! realm.write {
        realm.add(newAlarm)
    }
    scheduleNotification(for: newAlarm)
    delegate?.didAddNewAlarm()
    self.dismiss(animated: true, completion: nil)
}

2. 設定通知推播

我們透過 UNUserNotificationCenter 來實現通知推播，根據使用者選擇的鬧鐘時間與重複日期，來設定每日或單次提醒：

func scheduleNotification(for alarm: AlarmData) {
    let center = UNUserNotificationCenter.current()
    let content = UNMutableNotificationContent()
    content.title = alarm.name
    content.body = "\(alarm.alarmTime)到了！"
    content.sound = UNNotificationSound(named: UNNotificationSoundName(rawValue: "\(alarm.sound).mp3"))
    
    let dateComponents = Calendar.current.dateComponents([.hour, .minute], from: formatStringToDate(alarm.alarmTime) ?? Date())
    
    if alarm.repeatDays.contains(true) {
        for (index, isSelected) in alarm.repeatDays.enumerated() where isSelected {
            var triggerDateComponents = dateComponents
            triggerDateComponents.weekday = index + 1
            let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDateComponents, repeats: true)
            let request = UNNotificationRequest(identifier: "\(alarm.creatTime)_\(index)", content: content, trigger: trigger)
            center.add(request)
        }
    } else {
        let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)
        let request = UNNotificationRequest(identifier: alarm.creatTime, content: content, trigger: trigger)
        center.add(request)
    }
}

總結

透過以上步驟，我們已實現鬧鐘的新增、編輯、刪除及通知推播功能，並支援重複鬧鐘與自訂鈴聲的選擇。透過 Realm 存取資料並與 UNUserNotificationCenter 整合，我們可以在應用中輕鬆管理鬧鐘提醒。

這樣分篇可以更清晰地展示功能並便於讀者理解。