Day36 待辦清單終篇 (定時提醒)

11th鐵人賽

mikewang

團隊G社三劍客

2019-10-22 23:30:54

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20191022

前言

今天的內容一樣是代辦清單App，已經介紹過了推播通知的功能，現在我們要先增一個定時提醒的功能，並在提醒時間到時，發出推播通知。

現在，我們馬上開始！

練習紀錄

前置作業

主要是推播功能相關代碼，請參考Day31的文章，這邊僅列出修改要點

Day31 石虎的推播通知
https://ithelp.ithome.com.tw/articles/10228613

修改AppDelegate.swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:
[UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 前景通知
    UNUserNotificationCenter.current().delegate = self
    
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
            if granted {
                print("使用者同意接收推播通知")
            }
    }
    
    return true
}

AppDelegate.swift最下方加入

extension AppDelegate: UNUserNotificationCenterDelegate {
 
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent
notification: UNNotification, withCompletionHandler completionHandler: @escaping
(UNNotificationPresentationOptions) -> Void) {
        completionHandler([.badge, .sound, .alert])
    }
    
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response:
UNNotificationResponse, withCompletionHandler completionHandler:  @escaping () ->
Void) {
        
        let content = response.notification.request.content
        print("title \(content.title)")
        print("userInfo \(content.userInfo)")
        print("actionIdentifier \(response.actionIdentifier)")
        
        completionHandler()
    }
}

UI & 程式碼

在畫面上加入三個元件(Label, Switch, Date Picker)

這邊UI的設計思維，是一開始先將日期的元件隱藏，等到Switch開關打開後，再顯示
而推播的通知也跟者Save功能，一起被送出

將元件與程式碼做連結

在SwitchChanged的事件中，加入以下代碼

@IBAction func dateSwitchChanged(_ sender: UISwitch) {
    //countDatePicker.isHidden = !sender.isOn
    if sender.isOn {
        taskDatePicker.isHidden = false
    } else {
        taskDatePicker.isHidden = true
    }
}

註解的一行寫法意思一樣，不過保留原寫法比較好閱讀
當開關打開，Date Picker也跟者顯示

在Save功能加上推播通知

@IBAction func saveButtonPressed(_ sender: UIButton) {
    guard let content = taskTextField.text,
        let id = todo?.id else { return }
    
    if !content.isEmpty {
        let filter = "id == '\(id)' and status != 'deleted'"
        let realm = try! Realm()
        guard let realmTodo = RealmHelper.loadToDoListWithFilter(filter: filter) .first else { return }
        
        try! realm.write {
            realmTodo.content = content
        }
        
        if dateSwitch.isOn {
            let date = taskDatePicker.date
            let components = Calendar.current.dateComponents([ .year, .month, .day, .hour, .minute], from: date)
            
            print("date: \(date)")
            print("conponents: \(String(describing: components.date))")
            
            let notificationContent = UNMutableNotificationContent()
            notificationContent.title = content
            notificationContent.body = "任務將於 \(date) 到期"
            notificationContent.badge = 3
            notificationContent.sound = UNNotificationSound.default
            let trigger = UNCalendarNotificationTrigger(dateMatching: components, repeats: false)
            let request = UNNotificationRequest(identifier: "todoNotification", content: notificationContent, trigger:
trigger)
            UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
        } else {
            // remove notifications
            UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: ["todoNotification"])
            UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: ["todoNotification"])
        }
        
        
        // return List
        navigationController?.popViewController(animated: true)
    }
}